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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
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 * particular file as subject to the "Classpath" exception as provided
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  * Neither the name of JSR-310 nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package java.time;

import static java.time.temporal.ChronoField.INSTANT_SECONDS;
import static java.time.temporal.ChronoField.NANO_OF_SECOND;
import static java.time.temporal.ChronoField.OFFSET_SECONDS;

import java.io.DataOutput;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.time.chrono.ChronoZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalQuery;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
import java.time.zone.ZoneOffsetTransition;
import java.time.zone.ZoneRules;
import java.util.List;
import java.util.Objects;


A date-time with a time-zone in the ISO-8601 calendar system, such as 2007-12-03T10:15:30+01:00 Europe/Paris. 
 ZonedDateTime is an immutable representation of a date-time with a time-zone. This class stores all date and time fields, to a precision of nanoseconds, and a time-zone, with a zone offset used to handle ambiguous local date-times. For example, the value "2nd October 2007 at 13:45.30.123456789 +02:00 in the Europe/Paris time-zone" can be stored in a ZonedDateTime. 
 This class handles conversion from the local time-line of LocalDateTime to the instant time-line of Instant. The difference between the two time-lines is the offset from UTC/Greenwich, represented by a ZoneOffset. 
 Converting between the two time-lines involves calculating the offset using the rules accessed from the ZoneId. Obtaining the offset for an instant is simple, as there is exactly one valid offset for each instant. By contrast, obtaining the offset for a local date-time is not straightforward. There are three cases: 
    

  • Normal, with one valid offset. For the vast majority of the year, the normal
 case applies, where there is a single valid offset for the local date-time.
    • 

  • Gap, with zero valid offsets. This is when clocks jump forward typically
 due to the spring daylight savings change from "winter" to "summer".
 In a gap there are local date-time values with no valid offset.
    • 

  • Overlap, with two valid offsets. This is when clocks are set back typically
 due to the autumn daylight savings change from "summer" to "winter".
 In an overlap there are local date-time values with two valid offsets.
    • 




Any method that converts directly or implicitly from a local date-time to an
instant by obtaining the offset has the potential to be complicated.


For Gaps, the general strategy is that if the local date-time falls in the
middle of a Gap, then the resulting zoned date-time will have a local date-time
shifted forwards by the length of the Gap, resulting in a date-time in the later
offset, typically "summer" time.

 For Overlaps, the general strategy is that if the local date-time falls in the middle of an Overlap, then the previous offset will be retained. If there is no previous offset, or the previous offset is invalid, then the earlier offset is used, typically "summer" time.. Two additional methods, withEarlierOffsetAtOverlap() and withLaterOffsetAtOverlap(), help manage the case of an overlap. 
 In terms of design, this class should be viewed primarily as the combination of a LocalDateTime and a ZoneId. The ZoneOffset is a vital, but secondary, piece of information, used to ensure that the class represents an instant, especially during a daylight savings overlap. 

This is a value-based class; use of identity-sensitive operations (including reference equality (==), identity hash code, or synchronization) on instances of ZonedDateTime may have unpredictable results and should be avoided. The equals method should be used for comparisons. 
Implementation Requirements: A ZonedDateTime holds state equivalent to three separate objects, a LocalDateTime, a ZoneId and the resolved ZoneOffset. The offset and local date-time are used to define an instant when necessary. The zone ID is used to obtain the rules for how and when the offset changes. The offset cannot be freely set, as the zone controls which offsets are valid. 

This class is immutable and thread-safe.
Since:1.8
/**
 * A date-time with a time-zone in the ISO-8601 calendar system,
 * such as {@code 2007-12-03T10:15:30+01:00 Europe/Paris}.
 * <p>
 * {@code ZonedDateTime} is an immutable representation of a date-time with a time-zone.
 * This class stores all date and time fields, to a precision of nanoseconds,
 * and a time-zone, with a zone offset used to handle ambiguous local date-times.
 * For example, the value
 * "2nd October 2007 at 13:45.30.123456789 +02:00 in the Europe/Paris time-zone"
 * can be stored in a {@code ZonedDateTime}.
 * <p>
 * This class handles conversion from the local time-line of {@code LocalDateTime}
 * to the instant time-line of {@code Instant}.
 * The difference between the two time-lines is the offset from UTC/Greenwich,
 * represented by a {@code ZoneOffset}.
 * <p>
 * Converting between the two time-lines involves calculating the offset using the
 * {@link ZoneRules rules} accessed from the {@code ZoneId}.
 * Obtaining the offset for an instant is simple, as there is exactly one valid
 * offset for each instant. By contrast, obtaining the offset for a local date-time
 * is not straightforward. There are three cases:
 * <ul>
 * <li>Normal, with one valid offset. For the vast majority of the year, the normal
 *  case applies, where there is a single valid offset for the local date-time.</li>
 * <li>Gap, with zero valid offsets. This is when clocks jump forward typically
 *  due to the spring daylight savings change from "winter" to "summer".
 *  In a gap there are local date-time values with no valid offset.</li>
 * <li>Overlap, with two valid offsets. This is when clocks are set back typically
 *  due to the autumn daylight savings change from "summer" to "winter".
 *  In an overlap there are local date-time values with two valid offsets.</li>
 * </ul>
 * <p>
 * Any method that converts directly or implicitly from a local date-time to an
 * instant by obtaining the offset has the potential to be complicated.
 * <p>
 * For Gaps, the general strategy is that if the local date-time falls in the
 * middle of a Gap, then the resulting zoned date-time will have a local date-time
 * shifted forwards by the length of the Gap, resulting in a date-time in the later
 * offset, typically "summer" time.
 * <p>
 * For Overlaps, the general strategy is that if the local date-time falls in the
 * middle of an Overlap, then the previous offset will be retained. If there is no
 * previous offset, or the previous offset is invalid, then the earlier offset is
 * used, typically "summer" time.. Two additional methods,
 * {@link #withEarlierOffsetAtOverlap()} and {@link #withLaterOffsetAtOverlap()},
 * help manage the case of an overlap.
 * <p>
 * In terms of design, this class should be viewed primarily as the combination
 * of a {@code LocalDateTime} and a {@code ZoneId}. The {@code ZoneOffset} is
 * a vital, but secondary, piece of information, used to ensure that the class
 * represents an instant, especially during a daylight savings overlap.
 *
 * <p>
 * This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
 * class; use of identity-sensitive operations (including reference equality
 * ({@code ==}), identity hash code, or synchronization) on instances of
 * {@code ZonedDateTime} may have unpredictable results and should be avoided.
 * The {@code equals} method should be used for comparisons.
 *
 * @implSpec
 * A {@code ZonedDateTime} holds state equivalent to three separate objects,
 * a {@code LocalDateTime}, a {@code ZoneId} and the resolved {@code ZoneOffset}.
 * The offset and local date-time are used to define an instant when necessary.
 * The zone ID is used to obtain the rules for how and when the offset changes.
 * The offset cannot be freely set, as the zone controls which offsets are valid.
 * <p>
 * This class is immutable and thread-safe.
 *
 * @since 1.8
 */
public final class ZonedDateTime
        implements Temporal, ChronoZonedDateTime<LocalDate>, Serializable {

    
Serialization version.

/**
     * Serialization version.
     */
    private static final long serialVersionUID = -6260982410461394882L;

    
The local date-time.

/**
     * The local date-time.
     */
    private final LocalDateTime dateTime;
    
The offset from UTC/Greenwich.

/**
     * The offset from UTC/Greenwich.
     */
    private final ZoneOffset offset;
    
The time-zone.

/**
     * The time-zone.
     */
    private final ZoneId zone;

    //-----------------------------------------------------------------------
    
Obtains the current date-time from the system clock in the default time-zone.

 This will query the system clock in the default time-zone to obtain the current date-time. The zone and offset will be set based on the time-zone in the clock. 

Using this method will prevent the ability to use an alternate clock for testing
because the clock is hard-coded.

Returns:the current date-time using the system clock, not null
/**
     * Obtains the current date-time from the system clock in the default time-zone.
     * <p>
     * This will query the {@link Clock#systemDefaultZone() system clock} in the default
     * time-zone to obtain the current date-time.
     * The zone and offset will be set based on the time-zone in the clock.
     * <p>
     * Using this method will prevent the ability to use an alternate clock for testing
     * because the clock is hard-coded.
     *
     * @return the current date-time using the system clock, not null
     */
    public static ZonedDateTime now() {
        return now(Clock.systemDefaultZone());
    }

    
Obtains the current date-time from the system clock in the specified time-zone.

 This will query the system clock to obtain the current date-time. Specifying the time-zone avoids dependence on the default time-zone. The offset will be calculated from the specified time-zone. 

Using this method will prevent the ability to use an alternate clock for testing
because the clock is hard-coded.

Params:
  • zone –  the zone ID to use, not null
Returns:the current date-time using the system clock, not null
/**
     * Obtains the current date-time from the system clock in the specified time-zone.
     * <p>
     * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current date-time.
     * Specifying the time-zone avoids dependence on the default time-zone.
     * The offset will be calculated from the specified time-zone.
     * <p>
     * Using this method will prevent the ability to use an alternate clock for testing
     * because the clock is hard-coded.
     *
     * @param zone  the zone ID to use, not null
     * @return the current date-time using the system clock, not null
     */
    public static ZonedDateTime now(ZoneId zone) {
        return now(Clock.system(zone));
    }

    
Obtains the current date-time from the specified clock.


This will query the specified clock to obtain the current date-time.
The zone and offset will be set based on the time-zone in the clock.

 Using this method allows the use of an alternate clock for testing. The alternate clock may be introduced using dependency injection. 
Params:
  • clock –  the clock to use, not null
Returns:the current date-time, not null
/**
     * Obtains the current date-time from the specified clock.
     * <p>
     * This will query the specified clock to obtain the current date-time.
     * The zone and offset will be set based on the time-zone in the clock.
     * <p>
     * Using this method allows the use of an alternate clock for testing.
     * The alternate clock may be introduced using {@link Clock dependency injection}.
     *
     * @param clock  the clock to use, not null
     * @return the current date-time, not null
     */
    public static ZonedDateTime now(Clock clock) {
        Objects.requireNonNull(clock, "clock");
        final Instant now = clock.instant();  // called once
        return ofInstant(now, clock.getZone());
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of ZonedDateTime from a local date and time. 

This creates a zoned date-time matching the input local date and time as closely as possible.
Time-zone rules, such as daylight savings, mean that not every local date-time
is valid for the specified zone, thus the local date-time may be adjusted.

 The local date time and first combined to form a local date-time. The local date-time is then resolved to a single instant on the time-line. This is achieved by finding a valid offset from UTC/Greenwich for the local date-time as defined by the rules of the zone ID. 

In most cases, there is only one valid offset for a local date-time.
In the case of an overlap, when clocks are set back, there are two valid offsets.
This method uses the earlier offset typically corresponding to "summer".


In the case of a gap, when clocks jump forward, there is no valid offset.
Instead, the local date-time is adjusted to be later by the length of the gap.
For a typical one hour daylight savings change, the local date-time will be
moved one hour later into the offset typically corresponding to "summer".

Params:
  • date –  the local date, not null
  • time –  the local time, not null
  • zone –  the time-zone, not null
Returns:the offset date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from a local date and time.
     * <p>
     * This creates a zoned date-time matching the input local date and time as closely as possible.
     * Time-zone rules, such as daylight savings, mean that not every local date-time
     * is valid for the specified zone, thus the local date-time may be adjusted.
     * <p>
     * The local date time and first combined to form a local date-time.
     * The local date-time is then resolved to a single instant on the time-line.
     * This is achieved by finding a valid offset from UTC/Greenwich for the local
     * date-time as defined by the {@link ZoneRules rules} of the zone ID.
     *<p>
     * In most cases, there is only one valid offset for a local date-time.
     * In the case of an overlap, when clocks are set back, there are two valid offsets.
     * This method uses the earlier offset typically corresponding to "summer".
     * <p>
     * In the case of a gap, when clocks jump forward, there is no valid offset.
     * Instead, the local date-time is adjusted to be later by the length of the gap.
     * For a typical one hour daylight savings change, the local date-time will be
     * moved one hour later into the offset typically corresponding to "summer".
     *
     * @param date  the local date, not null
     * @param time  the local time, not null
     * @param zone  the time-zone, not null
     * @return the offset date-time, not null
     */
    public static ZonedDateTime of(LocalDate date, LocalTime time, ZoneId zone) {
        return of(LocalDateTime.of(date, time), zone);
    }

    
Obtains an instance of ZonedDateTime from a local date-time. 

This creates a zoned date-time matching the input local date-time as closely as possible.
Time-zone rules, such as daylight savings, mean that not every local date-time
is valid for the specified zone, thus the local date-time may be adjusted.

 The local date-time is resolved to a single instant on the time-line. This is achieved by finding a valid offset from UTC/Greenwich for the local date-time as defined by the rules of the zone ID. 

In most cases, there is only one valid offset for a local date-time.
In the case of an overlap, when clocks are set back, there are two valid offsets.
This method uses the earlier offset typically corresponding to "summer".


In the case of a gap, when clocks jump forward, there is no valid offset.
Instead, the local date-time is adjusted to be later by the length of the gap.
For a typical one hour daylight savings change, the local date-time will be
moved one hour later into the offset typically corresponding to "summer".

Params:
  • localDateTime –  the local date-time, not null
  • zone –  the time-zone, not null
Returns:the zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from a local date-time.
     * <p>
     * This creates a zoned date-time matching the input local date-time as closely as possible.
     * Time-zone rules, such as daylight savings, mean that not every local date-time
     * is valid for the specified zone, thus the local date-time may be adjusted.
     * <p>
     * The local date-time is resolved to a single instant on the time-line.
     * This is achieved by finding a valid offset from UTC/Greenwich for the local
     * date-time as defined by the {@link ZoneRules rules} of the zone ID.
     *<p>
     * In most cases, there is only one valid offset for a local date-time.
     * In the case of an overlap, when clocks are set back, there are two valid offsets.
     * This method uses the earlier offset typically corresponding to "summer".
     * <p>
     * In the case of a gap, when clocks jump forward, there is no valid offset.
     * Instead, the local date-time is adjusted to be later by the length of the gap.
     * For a typical one hour daylight savings change, the local date-time will be
     * moved one hour later into the offset typically corresponding to "summer".
     *
     * @param localDateTime  the local date-time, not null
     * @param zone  the time-zone, not null
     * @return the zoned date-time, not null
     */
    public static ZonedDateTime of(LocalDateTime localDateTime, ZoneId zone) {
        return ofLocal(localDateTime, zone, null);
    }

    
Obtains an instance of ZonedDateTime from a year, month, day, hour, minute, second, nanosecond and time-zone. 

This creates a zoned date-time matching the local date-time of the seven
specified fields as closely as possible.
Time-zone rules, such as daylight savings, mean that not every local date-time
is valid for the specified zone, thus the local date-time may be adjusted.

 The local date-time is resolved to a single instant on the time-line. This is achieved by finding a valid offset from UTC/Greenwich for the local date-time as defined by the rules of the zone ID. 

In most cases, there is only one valid offset for a local date-time.
In the case of an overlap, when clocks are set back, there are two valid offsets.
This method uses the earlier offset typically corresponding to "summer".


In the case of a gap, when clocks jump forward, there is no valid offset.
Instead, the local date-time is adjusted to be later by the length of the gap.
For a typical one hour daylight savings change, the local date-time will be
moved one hour later into the offset typically corresponding to "summer".

 This method exists primarily for writing test cases. Non test-code will typically use other methods to create an offset time. LocalDateTime has five additional convenience variants of the equivalent factory method taking fewer arguments. They are not provided here to reduce the footprint of the API. 
Params:
  • year –  the year to represent, from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, from 1 (January) to 12 (December)
  • dayOfMonth –  the day-of-month to represent, from 1 to 31
  • hour –  the hour-of-day to represent, from 0 to 23
  • minute –  the minute-of-hour to represent, from 0 to 59
  • second –  the second-of-minute to represent, from 0 to 59
  • nanoOfSecond –  the nano-of-second to represent, from 0 to 999,999,999
  • zone –  the time-zone, not null
Throws:
  • DateTimeException – if the value of any field is out of range, or
 if the day-of-month is invalid for the month-year
Returns:the offset date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from a year, month, day,
     * hour, minute, second, nanosecond and time-zone.
     * <p>
     * This creates a zoned date-time matching the local date-time of the seven
     * specified fields as closely as possible.
     * Time-zone rules, such as daylight savings, mean that not every local date-time
     * is valid for the specified zone, thus the local date-time may be adjusted.
     * <p>
     * The local date-time is resolved to a single instant on the time-line.
     * This is achieved by finding a valid offset from UTC/Greenwich for the local
     * date-time as defined by the {@link ZoneRules rules} of the zone ID.
     *<p>
     * In most cases, there is only one valid offset for a local date-time.
     * In the case of an overlap, when clocks are set back, there are two valid offsets.
     * This method uses the earlier offset typically corresponding to "summer".
     * <p>
     * In the case of a gap, when clocks jump forward, there is no valid offset.
     * Instead, the local date-time is adjusted to be later by the length of the gap.
     * For a typical one hour daylight savings change, the local date-time will be
     * moved one hour later into the offset typically corresponding to "summer".
     * <p>
     * This method exists primarily for writing test cases.
     * Non test-code will typically use other methods to create an offset time.
     * {@code LocalDateTime} has five additional convenience variants of the
     * equivalent factory method taking fewer arguments.
     * They are not provided here to reduce the footprint of the API.
     *
     * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
     * @param dayOfMonth  the day-of-month to represent, from 1 to 31
     * @param hour  the hour-of-day to represent, from 0 to 23
     * @param minute  the minute-of-hour to represent, from 0 to 59
     * @param second  the second-of-minute to represent, from 0 to 59
     * @param nanoOfSecond  the nano-of-second to represent, from 0 to 999,999,999
     * @param zone  the time-zone, not null
     * @return the offset date-time, not null
     * @throws DateTimeException if the value of any field is out of range, or
     *  if the day-of-month is invalid for the month-year
     */
    public static ZonedDateTime of(
            int year, int month, int dayOfMonth,
            int hour, int minute, int second, int nanoOfSecond, ZoneId zone) {
        LocalDateTime dt = LocalDateTime.of(year, month, dayOfMonth, hour, minute, second, nanoOfSecond);
        return ofLocal(dt, zone, null);
    }

    
Obtains an instance of ZonedDateTime from a local date-time using the preferred offset if possible. 
 The local date-time is resolved to a single instant on the time-line. This is achieved by finding a valid offset from UTC/Greenwich for the local date-time as defined by the rules of the zone ID. 

In most cases, there is only one valid offset for a local date-time.
In the case of an overlap, where clocks are set back, there are two valid offsets.
If the preferred offset is one of the valid offsets then it is used.
Otherwise the earlier valid offset is used, typically corresponding to "summer".


In the case of a gap, where clocks jump forward, there is no valid offset.
Instead, the local date-time is adjusted to be later by the length of the gap.
For a typical one hour daylight savings change, the local date-time will be
moved one hour later into the offset typically corresponding to "summer".

Params:
  • localDateTime –  the local date-time, not null
  • zone –  the time-zone, not null
  • preferredOffset –  the zone offset, null if no preference
Returns:the zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from a local date-time
     * using the preferred offset if possible.
     * <p>
     * The local date-time is resolved to a single instant on the time-line.
     * This is achieved by finding a valid offset from UTC/Greenwich for the local
     * date-time as defined by the {@link ZoneRules rules} of the zone ID.
     *<p>
     * In most cases, there is only one valid offset for a local date-time.
     * In the case of an overlap, where clocks are set back, there are two valid offsets.
     * If the preferred offset is one of the valid offsets then it is used.
     * Otherwise the earlier valid offset is used, typically corresponding to "summer".
     * <p>
     * In the case of a gap, where clocks jump forward, there is no valid offset.
     * Instead, the local date-time is adjusted to be later by the length of the gap.
     * For a typical one hour daylight savings change, the local date-time will be
     * moved one hour later into the offset typically corresponding to "summer".
     *
     * @param localDateTime  the local date-time, not null
     * @param zone  the time-zone, not null
     * @param preferredOffset  the zone offset, null if no preference
     * @return the zoned date-time, not null
     */
    public static ZonedDateTime ofLocal(LocalDateTime localDateTime, ZoneId zone, ZoneOffset preferredOffset) {
        Objects.requireNonNull(localDateTime, "localDateTime");
        Objects.requireNonNull(zone, "zone");
        if (zone instanceof ZoneOffset) {
            return new ZonedDateTime(localDateTime, (ZoneOffset) zone, zone);
        }
        ZoneRules rules = zone.getRules();
        List<ZoneOffset> validOffsets = rules.getValidOffsets(localDateTime);
        ZoneOffset offset;
        if (validOffsets.size() == 1) {
            offset = validOffsets.get(0);
        } else if (validOffsets.size() == 0) {
            ZoneOffsetTransition trans = rules.getTransition(localDateTime);
            localDateTime = localDateTime.plusSeconds(trans.getDuration().getSeconds());
            offset = trans.getOffsetAfter();
        } else {
            if (preferredOffset != null && validOffsets.contains(preferredOffset)) {
                offset = preferredOffset;
            } else {
                offset = Objects.requireNonNull(validOffsets.get(0), "offset");  // protect against bad ZoneRules
            }
        }
        return new ZonedDateTime(localDateTime, offset, zone);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of ZonedDateTime from an Instant. 
 This creates a zoned date-time with the same instant as that specified. Calling ChronoZonedDateTime<LocalDate>.toInstant() will return an instant equal to the one used here. 

Converting an instant to a zoned date-time is simple as there is only one valid
offset for each instant.

Params:
  • instant –  the instant to create the date-time from, not null
  • zone –  the time-zone, not null
Throws:
Returns:the zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from an {@code Instant}.
     * <p>
     * This creates a zoned date-time with the same instant as that specified.
     * Calling {@link #toInstant()} will return an instant equal to the one used here.
     * <p>
     * Converting an instant to a zoned date-time is simple as there is only one valid
     * offset for each instant.
     *
     * @param instant  the instant to create the date-time from, not null
     * @param zone  the time-zone, not null
     * @return the zoned date-time, not null
     * @throws DateTimeException if the result exceeds the supported range
     */
    public static ZonedDateTime ofInstant(Instant instant, ZoneId zone) {
        Objects.requireNonNull(instant, "instant");
        Objects.requireNonNull(zone, "zone");
        return create(instant.getEpochSecond(), instant.getNano(), zone);
    }

    
Obtains an instance of ZonedDateTime from the instant formed by combining the local date-time and offset. 
 This creates a zoned date-time by combining the LocalDateTime and ZoneOffset. This combination uniquely specifies an instant without ambiguity. 

Converting an instant to a zoned date-time is simple as there is only one valid
offset for each instant. If the valid offset is different to the offset specified,
then the date-time and offset of the zoned date-time will differ from those specified.

 If the ZoneId to be used is a ZoneOffset, this method is equivalent to of(LocalDateTime, ZoneId). 
Params:
  • localDateTime –  the local date-time, not null
  • offset –  the zone offset, not null
  • zone –  the time-zone, not null
Returns:the zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from the instant formed by combining
     * the local date-time and offset.
     * <p>
     * This creates a zoned date-time by {@link LocalDateTime#toInstant(ZoneOffset) combining}
     * the {@code LocalDateTime} and {@code ZoneOffset}.
     * This combination uniquely specifies an instant without ambiguity.
     * <p>
     * Converting an instant to a zoned date-time is simple as there is only one valid
     * offset for each instant. If the valid offset is different to the offset specified,
     * then the date-time and offset of the zoned date-time will differ from those specified.
     * <p>
     * If the {@code ZoneId} to be used is a {@code ZoneOffset}, this method is equivalent
     * to {@link #of(LocalDateTime, ZoneId)}.
     *
     * @param localDateTime  the local date-time, not null
     * @param offset  the zone offset, not null
     * @param zone  the time-zone, not null
     * @return the zoned date-time, not null
     */
    public static ZonedDateTime ofInstant(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone) {
        Objects.requireNonNull(localDateTime, "localDateTime");
        Objects.requireNonNull(offset, "offset");
        Objects.requireNonNull(zone, "zone");
        if (zone.getRules().isValidOffset(localDateTime, offset)) {
            return new ZonedDateTime(localDateTime, offset, zone);
        }
        return create(localDateTime.toEpochSecond(offset), localDateTime.getNano(), zone);
    }

    
Obtains an instance of ZonedDateTime using seconds from the epoch of 1970-01-01T00:00:00Z. 
Params:
  • epochSecond –  the number of seconds from the epoch of 1970-01-01T00:00:00Z
  • nanoOfSecond –  the nanosecond within the second, from 0 to 999,999,999
  • zone –  the time-zone, not null
Throws:
Returns:the zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} using seconds from the
     * epoch of 1970-01-01T00:00:00Z.
     *
     * @param epochSecond  the number of seconds from the epoch of 1970-01-01T00:00:00Z
     * @param nanoOfSecond  the nanosecond within the second, from 0 to 999,999,999
     * @param zone  the time-zone, not null
     * @return the zoned date-time, not null
     * @throws DateTimeException if the result exceeds the supported range
     */
    private static ZonedDateTime create(long epochSecond, int nanoOfSecond, ZoneId zone) {
        ZoneRules rules = zone.getRules();
        Instant instant = Instant.ofEpochSecond(epochSecond, nanoOfSecond);  // TODO: rules should be queryable by epochSeconds
        ZoneOffset offset = rules.getOffset(instant);
        LocalDateTime ldt = LocalDateTime.ofEpochSecond(epochSecond, nanoOfSecond, offset);
        return new ZonedDateTime(ldt, offset, zone);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of ZonedDateTime strictly validating the combination of local date-time, offset and zone ID. 

This creates a zoned date-time ensuring that the offset is valid for the
local date-time according to the rules of the specified zone.
If the offset is invalid, an exception is thrown.

Params:
  • localDateTime –  the local date-time, not null
  • offset –  the zone offset, not null
  • zone –  the time-zone, not null
Throws:
Returns:the zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} strictly validating the
     * combination of local date-time, offset and zone ID.
     * <p>
     * This creates a zoned date-time ensuring that the offset is valid for the
     * local date-time according to the rules of the specified zone.
     * If the offset is invalid, an exception is thrown.
     *
     * @param localDateTime  the local date-time, not null
     * @param offset  the zone offset, not null
     * @param zone  the time-zone, not null
     * @return the zoned date-time, not null
     * @throws DateTimeException if the combination of arguments is invalid
     */
    public static ZonedDateTime ofStrict(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone) {
        Objects.requireNonNull(localDateTime, "localDateTime");
        Objects.requireNonNull(offset, "offset");
        Objects.requireNonNull(zone, "zone");
        ZoneRules rules = zone.getRules();
        if (rules.isValidOffset(localDateTime, offset) == false) {
            ZoneOffsetTransition trans = rules.getTransition(localDateTime);
            if (trans != null && trans.isGap()) {
                // error message says daylight savings for simplicity
                // even though there are other kinds of gaps
                throw new DateTimeException("LocalDateTime '" + localDateTime +
                        "' does not exist in zone '" + zone +
                        "' due to a gap in the local time-line, typically caused by daylight savings");
            }
            throw new DateTimeException("ZoneOffset '" + offset + "' is not valid for LocalDateTime '" +
                    localDateTime + "' in zone '" + zone + "'");
        }
        return new ZonedDateTime(localDateTime, offset, zone);
    }

    
Obtains an instance of ZonedDateTime leniently, for advanced use cases, allowing any combination of local date-time, offset and zone ID. 

This creates a zoned date-time with no checks other than no nulls.
This means that the resulting zoned date-time may have an offset that is in conflict
with the zone ID.


This method is intended for advanced use cases.
For example, consider the case where a zoned date-time with valid fields is created
and then stored in a database or serialization-based store. At some later point,
the object is then re-loaded. However, between those points in time, the government
that defined the time-zone has changed the rules, such that the originally stored
local date-time now does not occur. This method can be used to create the object
in an "invalid" state, despite the change in rules.

Params:
  • localDateTime –  the local date-time, not null
  • offset –  the zone offset, not null
  • zone –  the time-zone, not null
Returns:the zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} leniently, for advanced use cases,
     * allowing any combination of local date-time, offset and zone ID.
     * <p>
     * This creates a zoned date-time with no checks other than no nulls.
     * This means that the resulting zoned date-time may have an offset that is in conflict
     * with the zone ID.
     * <p>
     * This method is intended for advanced use cases.
     * For example, consider the case where a zoned date-time with valid fields is created
     * and then stored in a database or serialization-based store. At some later point,
     * the object is then re-loaded. However, between those points in time, the government
     * that defined the time-zone has changed the rules, such that the originally stored
     * local date-time now does not occur. This method can be used to create the object
     * in an "invalid" state, despite the change in rules.
     *
     * @param localDateTime  the local date-time, not null
     * @param offset  the zone offset, not null
     * @param zone  the time-zone, not null
     * @return the zoned date-time, not null
     */
    private static ZonedDateTime ofLenient(LocalDateTime localDateTime, ZoneOffset offset, ZoneId zone) {
        Objects.requireNonNull(localDateTime, "localDateTime");
        Objects.requireNonNull(offset, "offset");
        Objects.requireNonNull(zone, "zone");
        if (zone instanceof ZoneOffset && offset.equals(zone) == false) {
            throw new IllegalArgumentException("ZoneId must match ZoneOffset");
        }
        return new ZonedDateTime(localDateTime, offset, zone);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of ZonedDateTime from a temporal object. 
 This obtains a zoned date-time based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ZonedDateTime. 
 The conversion will first obtain a ZoneId from the temporal object, falling back to a ZoneOffset if necessary. It will then try to obtain an Instant, falling back to a LocalDateTime if necessary. The result will be either the combination of ZoneId or ZoneOffset with Instant or LocalDateTime. Implementations are permitted to perform optimizations such as accessing those fields that are equivalent to the relevant objects. 
 This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, ZonedDateTime::from. 
Params:
  • temporal –  the temporal object to convert, not null
Throws:
Returns:the zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from a temporal object.
     * <p>
     * This obtains a zoned date-time based on the specified temporal.
     * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
     * which this factory converts to an instance of {@code ZonedDateTime}.
     * <p>
     * The conversion will first obtain a {@code ZoneId} from the temporal object,
     * falling back to a {@code ZoneOffset} if necessary. It will then try to obtain
     * an {@code Instant}, falling back to a {@code LocalDateTime} if necessary.
     * The result will be either the combination of {@code ZoneId} or {@code ZoneOffset}
     * with {@code Instant} or {@code LocalDateTime}.
     * Implementations are permitted to perform optimizations such as accessing
     * those fields that are equivalent to the relevant objects.
     * <p>
     * This method matches the signature of the functional interface {@link TemporalQuery}
     * allowing it to be used as a query via method reference, {@code ZonedDateTime::from}.
     *
     * @param temporal  the temporal object to convert, not null
     * @return the zoned date-time, not null
     * @throws DateTimeException if unable to convert to an {@code ZonedDateTime}
     */
    public static ZonedDateTime from(TemporalAccessor temporal) {
        if (temporal instanceof ZonedDateTime) {
            return (ZonedDateTime) temporal;
        }
        try {
            ZoneId zone = ZoneId.from(temporal);
            if (temporal.isSupported(INSTANT_SECONDS)) {
                long epochSecond = temporal.getLong(INSTANT_SECONDS);
                int nanoOfSecond = temporal.get(NANO_OF_SECOND);
                return create(epochSecond, nanoOfSecond, zone);
            } else {
                LocalDate date = LocalDate.from(temporal);
                LocalTime time = LocalTime.from(temporal);
                return of(date, time, zone);
            }
        } catch (DateTimeException ex) {
            throw new DateTimeException("Unable to obtain ZonedDateTime from TemporalAccessor: " +
                    temporal + " of type " + temporal.getClass().getName(), ex);
        }
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of ZonedDateTime from a text string such as 2007-12-03T10:15:30+01:00[Europe/Paris]. 
 The string must represent a valid date-time and is parsed using DateTimeFormatter.ISO_ZONED_DATE_TIME. 
Params:
  • text –  the text to parse such as "2007-12-03T10:15:30+01:00[Europe/Paris]", not null
Throws:
Returns:the parsed zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from a text string such as
     * {@code 2007-12-03T10:15:30+01:00[Europe/Paris]}.
     * <p>
     * The string must represent a valid date-time and is parsed using
     * {@link java.time.format.DateTimeFormatter#ISO_ZONED_DATE_TIME}.
     *
     * @param text  the text to parse such as "2007-12-03T10:15:30+01:00[Europe/Paris]", not null
     * @return the parsed zoned date-time, not null
     * @throws DateTimeParseException if the text cannot be parsed
     */
    public static ZonedDateTime parse(CharSequence text) {
        return parse(text, DateTimeFormatter.ISO_ZONED_DATE_TIME);
    }

    
Obtains an instance of ZonedDateTime from a text string using a specific formatter. 

The text is parsed using the formatter, returning a date-time.

Params:
  • text –  the text to parse, not null
  • formatter –  the formatter to use, not null
Throws:
Returns:the parsed zoned date-time, not null
/**
     * Obtains an instance of {@code ZonedDateTime} from a text string using a specific formatter.
     * <p>
     * The text is parsed using the formatter, returning a date-time.
     *
     * @param text  the text to parse, not null
     * @param formatter  the formatter to use, not null
     * @return the parsed zoned date-time, not null
     * @throws DateTimeParseException if the text cannot be parsed
     */
    public static ZonedDateTime parse(CharSequence text, DateTimeFormatter formatter) {
        Objects.requireNonNull(formatter, "formatter");
        return formatter.parse(text, ZonedDateTime::from);
    }

    //-----------------------------------------------------------------------
    
Constructor.

Params:
  • dateTime –  the date-time, validated as not null
  • offset –  the zone offset, validated as not null
  • zone –  the time-zone, validated as not null
/**
     * Constructor.
     *
     * @param dateTime  the date-time, validated as not null
     * @param offset  the zone offset, validated as not null
     * @param zone  the time-zone, validated as not null
     */
    private ZonedDateTime(LocalDateTime dateTime, ZoneOffset offset, ZoneId zone) {
        this.dateTime = dateTime;
        this.offset = offset;
        this.zone = zone;
    }

    
Resolves the new local date-time using this zone ID, retaining the offset if possible.

Params:
  • newDateTime –  the new local date-time, not null
Returns:the zoned date-time, not null
/**
     * Resolves the new local date-time using this zone ID, retaining the offset if possible.
     *
     * @param newDateTime  the new local date-time, not null
     * @return the zoned date-time, not null
     */
    private ZonedDateTime resolveLocal(LocalDateTime newDateTime) {
        return ofLocal(newDateTime, zone, offset);
    }

    
Resolves the new local date-time using the offset to identify the instant.

Params:
  • newDateTime –  the new local date-time, not null
Returns:the zoned date-time, not null
/**
     * Resolves the new local date-time using the offset to identify the instant.
     *
     * @param newDateTime  the new local date-time, not null
     * @return the zoned date-time, not null
     */
    private ZonedDateTime resolveInstant(LocalDateTime newDateTime) {
        return ofInstant(newDateTime, offset, zone);
    }

    
Resolves the offset into this zoned date-time for the with methods.


This typically ignores the offset, unless it can be used to switch offset in a DST overlap.

Params:
  • offset –  the offset, not null
Returns:the zoned date-time, not null
/**
     * Resolves the offset into this zoned date-time for the with methods.
     * <p>
     * This typically ignores the offset, unless it can be used to switch offset in a DST overlap.
     *
     * @param offset  the offset, not null
     * @return the zoned date-time, not null
     */
    private ZonedDateTime resolveOffset(ZoneOffset offset) {
        if (offset.equals(this.offset) == false && zone.getRules().isValidOffset(dateTime, offset)) {
            return new ZonedDateTime(dateTime, offset, zone);
        }
        return this;
    }

    //-----------------------------------------------------------------------
    
Checks if the specified field is supported.

 This checks if this date-time can be queried for the specified field. If false, then calling the range, get and with(TemporalField, long) methods will throw an exception. 
 If the field is a ChronoField then the query is implemented here. The supported fields are: 
    

  • NANO_OF_SECOND 
  • NANO_OF_DAY 
  • MICRO_OF_SECOND 
  • MICRO_OF_DAY 
  • MILLI_OF_SECOND 
  • MILLI_OF_DAY 
  • SECOND_OF_MINUTE 
  • SECOND_OF_DAY 
  • MINUTE_OF_HOUR 
  • MINUTE_OF_DAY 
  • HOUR_OF_AMPM 
  • CLOCK_HOUR_OF_AMPM 
  • HOUR_OF_DAY 
  • CLOCK_HOUR_OF_DAY 
  • AMPM_OF_DAY 
  • DAY_OF_WEEK 
  • ALIGNED_DAY_OF_WEEK_IN_MONTH 
  • ALIGNED_DAY_OF_WEEK_IN_YEAR 
  • DAY_OF_MONTH 
  • DAY_OF_YEAR 
  • EPOCH_DAY 
  • ALIGNED_WEEK_OF_MONTH 
  • ALIGNED_WEEK_OF_YEAR 
  • MONTH_OF_YEAR 
  • PROLEPTIC_MONTH 
  • YEAR_OF_ERA 
  • YEAR 
  • ERA 
  • INSTANT_SECONDS 
  • OFFSET_SECONDS 
 All other ChronoField instances will return false. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.isSupportedBy(TemporalAccessor) passing this as the argument. Whether the field is supported is determined by the field. 
Params:
  • field –  the field to check, null returns false
Returns:true if the field is supported on this date-time, false if not
/**
     * Checks if the specified field is supported.
     * <p>
     * This checks if this date-time can be queried for the specified field.
     * If false, then calling the {@link #range(TemporalField) range},
     * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
     * methods will throw an exception.
     * <p>
     * If the field is a {@link ChronoField} then the query is implemented here.
     * The supported fields are:
     * <ul>
     * <li>{@code NANO_OF_SECOND}
     * <li>{@code NANO_OF_DAY}
     * <li>{@code MICRO_OF_SECOND}
     * <li>{@code MICRO_OF_DAY}
     * <li>{@code MILLI_OF_SECOND}
     * <li>{@code MILLI_OF_DAY}
     * <li>{@code SECOND_OF_MINUTE}
     * <li>{@code SECOND_OF_DAY}
     * <li>{@code MINUTE_OF_HOUR}
     * <li>{@code MINUTE_OF_DAY}
     * <li>{@code HOUR_OF_AMPM}
     * <li>{@code CLOCK_HOUR_OF_AMPM}
     * <li>{@code HOUR_OF_DAY}
     * <li>{@code CLOCK_HOUR_OF_DAY}
     * <li>{@code AMPM_OF_DAY}
     * <li>{@code DAY_OF_WEEK}
     * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
     * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
     * <li>{@code DAY_OF_MONTH}
     * <li>{@code DAY_OF_YEAR}
     * <li>{@code EPOCH_DAY}
     * <li>{@code ALIGNED_WEEK_OF_MONTH}
     * <li>{@code ALIGNED_WEEK_OF_YEAR}
     * <li>{@code MONTH_OF_YEAR}
     * <li>{@code PROLEPTIC_MONTH}
     * <li>{@code YEAR_OF_ERA}
     * <li>{@code YEAR}
     * <li>{@code ERA}
     * <li>{@code INSTANT_SECONDS}
     * <li>{@code OFFSET_SECONDS}
     * </ul>
     * All other {@code ChronoField} instances will return false.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
     * passing {@code this} as the argument.
     * Whether the field is supported is determined by the field.
     *
     * @param field  the field to check, null returns false
     * @return true if the field is supported on this date-time, false if not
     */
    @Override
    public boolean isSupported(TemporalField field) {
        return field instanceof ChronoField || (field != null && field.isSupportedBy(this));
    }

    
Checks if the specified unit is supported.

 This checks if the specified unit can be added to, or subtracted from, this date-time. If false, then calling the plus(long, TemporalUnit) and minus methods will throw an exception. 
 If the unit is a ChronoUnit then the query is implemented here. The supported units are: 
    

  • NANOS 
  • MICROS 
  • MILLIS 
  • SECONDS 
  • MINUTES 
  • HOURS 
  • HALF_DAYS 
  • DAYS 
  • WEEKS 
  • MONTHS 
  • YEARS 
  • DECADES 
  • CENTURIES 
  • MILLENNIA 
  • ERAS 
 All other ChronoUnit instances will return false. 
 If the unit is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.isSupportedBy(Temporal) passing this as the argument. Whether the unit is supported is determined by the unit. 
Params:
  • unit –  the unit to check, null returns false
Returns:true if the unit can be added/subtracted, false if not
/**
     * Checks if the specified unit is supported.
     * <p>
     * This checks if the specified unit can be added to, or subtracted from, this date-time.
     * If false, then calling the {@link #plus(long, TemporalUnit)} and
     * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
     * <p>
     * If the unit is a {@link ChronoUnit} then the query is implemented here.
     * The supported units are:
     * <ul>
     * <li>{@code NANOS}
     * <li>{@code MICROS}
     * <li>{@code MILLIS}
     * <li>{@code SECONDS}
     * <li>{@code MINUTES}
     * <li>{@code HOURS}
     * <li>{@code HALF_DAYS}
     * <li>{@code DAYS}
     * <li>{@code WEEKS}
     * <li>{@code MONTHS}
     * <li>{@code YEARS}
     * <li>{@code DECADES}
     * <li>{@code CENTURIES}
     * <li>{@code MILLENNIA}
     * <li>{@code ERAS}
     * </ul>
     * All other {@code ChronoUnit} instances will return false.
     * <p>
     * If the unit is not a {@code ChronoUnit}, then the result of this method
     * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
     * passing {@code this} as the argument.
     * Whether the unit is supported is determined by the unit.
     *
     * @param unit  the unit to check, null returns false
     * @return true if the unit can be added/subtracted, false if not
     */
    @Override  // override for Javadoc
    public boolean isSupported(TemporalUnit unit) {
        return ChronoZonedDateTime.super.isSupported(unit);
    }

    //-----------------------------------------------------------------------
    
Gets the range of valid values for the specified field.


The range object expresses the minimum and maximum valid values for a field.
This date-time is used to enhance the accuracy of the returned range.
If it is not possible to return the range, because the field is not supported
or for some other reason, an exception is thrown.

 If the field is a ChronoField then the query is implemented here. The supported fields will return appropriate range instances. All other ChronoField instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.rangeRefinedBy(TemporalAccessor) passing this as the argument. Whether the range can be obtained is determined by the field. 
Params:
  • field –  the field to query the range for, not null
Throws:
Returns:the range of valid values for the field, not null
/**
     * Gets the range of valid values for the specified field.
     * <p>
     * The range object expresses the minimum and maximum valid values for a field.
     * This date-time is used to enhance the accuracy of the returned range.
     * If it is not possible to return the range, because the field is not supported
     * or for some other reason, an exception is thrown.
     * <p>
     * If the field is a {@link ChronoField} then the query is implemented here.
     * The {@link #isSupported(TemporalField) supported fields} will return
     * appropriate range instances.
     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
     * passing {@code this} as the argument.
     * Whether the range can be obtained is determined by the field.
     *
     * @param field  the field to query the range for, not null
     * @return the range of valid values for the field, not null
     * @throws DateTimeException if the range for the field cannot be obtained
     * @throws UnsupportedTemporalTypeException if the field is not supported
     */
    @Override
    public ValueRange range(TemporalField field) {
        if (field instanceof ChronoField) {
            if (field == INSTANT_SECONDS || field == OFFSET_SECONDS) {
                return field.range();
            }
            return dateTime.range(field);
        }
        return field.rangeRefinedBy(this);
    }

    
Gets the value of the specified field from this date-time as an int. 

This queries this date-time for the value of the specified field.
The returned value will always be within the valid range of values for the field.
If it is not possible to return the value, because the field is not supported
or for some other reason, an exception is thrown.

 If the field is a ChronoField then the query is implemented here. The supported fields will return valid values based on this date-time, except NANO_OF_DAY, MICRO_OF_DAY, EPOCH_DAY, PROLEPTIC_MONTH and INSTANT_SECONDS which are too large to fit in an int and throw an UnsupportedTemporalTypeException. All other ChronoField instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field. 
Params:
  • field –  the field to get, not null
Throws:
Returns:the value for the field
/**
     * Gets the value of the specified field from this date-time as an {@code int}.
     * <p>
     * This queries this date-time for the value of the specified field.
     * The returned value will always be within the valid range of values for the field.
     * If it is not possible to return the value, because the field is not supported
     * or for some other reason, an exception is thrown.
     * <p>
     * If the field is a {@link ChronoField} then the query is implemented here.
     * The {@link #isSupported(TemporalField) supported fields} will return valid
     * values based on this date-time, except {@code NANO_OF_DAY}, {@code MICRO_OF_DAY},
     * {@code EPOCH_DAY}, {@code PROLEPTIC_MONTH} and {@code INSTANT_SECONDS} which are too
     * large to fit in an {@code int} and throw an {@code UnsupportedTemporalTypeException}.
     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
     * passing {@code this} as the argument. Whether the value can be obtained,
     * and what the value represents, is determined by the field.
     *
     * @param field  the field to get, not null
     * @return the value for the field
     * @throws DateTimeException if a value for the field cannot be obtained or
     *         the value is outside the range of valid values for the field
     * @throws UnsupportedTemporalTypeException if the field is not supported or
     *         the range of values exceeds an {@code int}
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override  // override for Javadoc and performance
    public int get(TemporalField field) {
        if (field instanceof ChronoField) {
            switch ((ChronoField) field) {
                case INSTANT_SECONDS:
                    throw new UnsupportedTemporalTypeException("Invalid field 'InstantSeconds' for get() method, use getLong() instead");
                case OFFSET_SECONDS:
                    return getOffset().getTotalSeconds();
            }
            return dateTime.get(field);
        }
        return ChronoZonedDateTime.super.get(field);
    }

    
Gets the value of the specified field from this date-time as a long. 

This queries this date-time for the value of the specified field.
If it is not possible to return the value, because the field is not supported
or for some other reason, an exception is thrown.

 If the field is a ChronoField then the query is implemented here. The supported fields will return valid values based on this date-time. All other ChronoField instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field. 
Params:
  • field –  the field to get, not null
Throws:
Returns:the value for the field
/**
     * Gets the value of the specified field from this date-time as a {@code long}.
     * <p>
     * This queries this date-time for the value of the specified field.
     * If it is not possible to return the value, because the field is not supported
     * or for some other reason, an exception is thrown.
     * <p>
     * If the field is a {@link ChronoField} then the query is implemented here.
     * The {@link #isSupported(TemporalField) supported fields} will return valid
     * values based on this date-time.
     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
     * passing {@code this} as the argument. Whether the value can be obtained,
     * and what the value represents, is determined by the field.
     *
     * @param field  the field to get, not null
     * @return the value for the field
     * @throws DateTimeException if a value for the field cannot be obtained
     * @throws UnsupportedTemporalTypeException if the field is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public long getLong(TemporalField field) {
        if (field instanceof ChronoField) {
            switch ((ChronoField) field) {
                case INSTANT_SECONDS: return toEpochSecond();
                case OFFSET_SECONDS: return getOffset().getTotalSeconds();
            }
            return dateTime.getLong(field);
        }
        return field.getFrom(this);
    }

    //-----------------------------------------------------------------------
    
Gets the zone offset, such as '+01:00'.


This is the offset of the local date-time from UTC/Greenwich.

Returns:the zone offset, not null
/**
     * Gets the zone offset, such as '+01:00'.
     * <p>
     * This is the offset of the local date-time from UTC/Greenwich.
     *
     * @return the zone offset, not null
     */
    @Override
    public ZoneOffset getOffset() {
        return offset;
    }

    
Returns a copy of this date-time changing the zone offset to the
earlier of the two valid offsets at a local time-line overlap.


This method only has any effect when the local time-line overlaps, such as
at an autumn daylight savings cutover. In this scenario, there are two
valid offsets for the local date-time. Calling this method will return
a zoned date-time with the earlier of the two selected.

 If this method is called when it is not an overlap, this is returned. 

This instance is immutable and unaffected by this method call.

Returns:a ZonedDateTime based on this date-time with the earlier offset, not null
/**
     * Returns a copy of this date-time changing the zone offset to the
     * earlier of the two valid offsets at a local time-line overlap.
     * <p>
     * This method only has any effect when the local time-line overlaps, such as
     * at an autumn daylight savings cutover. In this scenario, there are two
     * valid offsets for the local date-time. Calling this method will return
     * a zoned date-time with the earlier of the two selected.
     * <p>
     * If this method is called when it is not an overlap, {@code this}
     * is returned.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @return a {@code ZonedDateTime} based on this date-time with the earlier offset, not null
     */
    @Override
    public ZonedDateTime withEarlierOffsetAtOverlap() {
        ZoneOffsetTransition trans = getZone().getRules().getTransition(dateTime);
        if (trans != null && trans.isOverlap()) {
            ZoneOffset earlierOffset = trans.getOffsetBefore();
            if (earlierOffset.equals(offset) == false) {
                return new ZonedDateTime(dateTime, earlierOffset, zone);
            }
        }
        return this;
    }

    
Returns a copy of this date-time changing the zone offset to the
later of the two valid offsets at a local time-line overlap.


This method only has any effect when the local time-line overlaps, such as
at an autumn daylight savings cutover. In this scenario, there are two
valid offsets for the local date-time. Calling this method will return
a zoned date-time with the later of the two selected.

 If this method is called when it is not an overlap, this is returned. 

This instance is immutable and unaffected by this method call.

Returns:a ZonedDateTime based on this date-time with the later offset, not null
/**
     * Returns a copy of this date-time changing the zone offset to the
     * later of the two valid offsets at a local time-line overlap.
     * <p>
     * This method only has any effect when the local time-line overlaps, such as
     * at an autumn daylight savings cutover. In this scenario, there are two
     * valid offsets for the local date-time. Calling this method will return
     * a zoned date-time with the later of the two selected.
     * <p>
     * If this method is called when it is not an overlap, {@code this}
     * is returned.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @return a {@code ZonedDateTime} based on this date-time with the later offset, not null
     */
    @Override
    public ZonedDateTime withLaterOffsetAtOverlap() {
        ZoneOffsetTransition trans = getZone().getRules().getTransition(toLocalDateTime());
        if (trans != null) {
            ZoneOffset laterOffset = trans.getOffsetAfter();
            if (laterOffset.equals(offset) == false) {
                return new ZonedDateTime(dateTime, laterOffset, zone);
            }
        }
        return this;
    }

    //-----------------------------------------------------------------------
    
Gets the time-zone, such as 'Europe/Paris'.

 This returns the zone ID. This identifies the time-zone rules that determine when and how the offset from UTC/Greenwich changes. 
 The zone ID may be same as the offset. If this is true, then any future calculations, such as addition or subtraction, have no complex edge cases due to time-zone rules. See also withFixedOffsetZone(). 
Returns:the time-zone, not null
/**
     * Gets the time-zone, such as 'Europe/Paris'.
     * <p>
     * This returns the zone ID. This identifies the time-zone {@link ZoneRules rules}
     * that determine when and how the offset from UTC/Greenwich changes.
     * <p>
     * The zone ID may be same as the {@linkplain #getOffset() offset}.
     * If this is true, then any future calculations, such as addition or subtraction,
     * have no complex edge cases due to time-zone rules.
     * See also {@link #withFixedOffsetZone()}.
     *
     * @return the time-zone, not null
     */
    @Override
    public ZoneId getZone() {
        return zone;
    }

    
Returns a copy of this date-time with a different time-zone,
retaining the local date-time if possible.

 This method changes the time-zone and retains the local date-time. The local date-time is only changed if it is invalid for the new zone, determined using the same approach as ofLocal(LocalDateTime, ZoneId, ZoneOffset). 
 To change the zone and adjust the local date-time, use withZoneSameInstant(ZoneId). 

This instance is immutable and unaffected by this method call.

Params:
  • zone –  the time-zone to change to, not null
Returns:a ZonedDateTime based on this date-time with the requested zone, not null
/**
     * Returns a copy of this date-time with a different time-zone,
     * retaining the local date-time if possible.
     * <p>
     * This method changes the time-zone and retains the local date-time.
     * The local date-time is only changed if it is invalid for the new zone,
     * determined using the same approach as
     * {@link #ofLocal(LocalDateTime, ZoneId, ZoneOffset)}.
     * <p>
     * To change the zone and adjust the local date-time,
     * use {@link #withZoneSameInstant(ZoneId)}.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param zone  the time-zone to change to, not null
     * @return a {@code ZonedDateTime} based on this date-time with the requested zone, not null
     */
    @Override
    public ZonedDateTime withZoneSameLocal(ZoneId zone) {
        Objects.requireNonNull(zone, "zone");
        return this.zone.equals(zone) ? this : ofLocal(dateTime, zone, offset);
    }

    
Returns a copy of this date-time with a different time-zone,
retaining the instant.


This method changes the time-zone and retains the instant.
This normally results in a change to the local date-time.


This method is based on retaining the same instant, thus gaps and overlaps
in the local time-line have no effect on the result.

 To change the offset while keeping the local time, use withZoneSameLocal(ZoneId). 
Params:
  • zone –  the time-zone to change to, not null
Throws:
Returns:a ZonedDateTime based on this date-time with the requested zone, not null
/**
     * Returns a copy of this date-time with a different time-zone,
     * retaining the instant.
     * <p>
     * This method changes the time-zone and retains the instant.
     * This normally results in a change to the local date-time.
     * <p>
     * This method is based on retaining the same instant, thus gaps and overlaps
     * in the local time-line have no effect on the result.
     * <p>
     * To change the offset while keeping the local time,
     * use {@link #withZoneSameLocal(ZoneId)}.
     *
     * @param zone  the time-zone to change to, not null
     * @return a {@code ZonedDateTime} based on this date-time with the requested zone, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    @Override
    public ZonedDateTime withZoneSameInstant(ZoneId zone) {
        Objects.requireNonNull(zone, "zone");
        return this.zone.equals(zone) ? this :
            create(dateTime.toEpochSecond(offset), dateTime.getNano(), zone);
    }

    
Returns a copy of this date-time with the zone ID set to the offset.

 This returns a zoned date-time where the zone ID is the same as getOffset(). The local date-time, offset and instant of the result will be the same as in this date-time. 

Setting the date-time to a fixed single offset means that any future
calculations, such as addition or subtraction, have no complex edge cases
due to time-zone rules.
This might also be useful when sending a zoned date-time across a network,
as most protocols, such as ISO-8601, only handle offsets,
and not region-based zone IDs.

 This is equivalent to ZonedDateTime.of(zdt.toLocalDateTime(), zdt.getOffset()). 
Returns:a ZonedDateTime with the zone ID set to the offset, not null
/**
     * Returns a copy of this date-time with the zone ID set to the offset.
     * <p>
     * This returns a zoned date-time where the zone ID is the same as {@link #getOffset()}.
     * The local date-time, offset and instant of the result will be the same as in this date-time.
     * <p>
     * Setting the date-time to a fixed single offset means that any future
     * calculations, such as addition or subtraction, have no complex edge cases
     * due to time-zone rules.
     * This might also be useful when sending a zoned date-time across a network,
     * as most protocols, such as ISO-8601, only handle offsets,
     * and not region-based zone IDs.
     * <p>
     * This is equivalent to {@code ZonedDateTime.of(zdt.toLocalDateTime(), zdt.getOffset())}.
     *
     * @return a {@code ZonedDateTime} with the zone ID set to the offset, not null
     */
    public ZonedDateTime withFixedOffsetZone() {
        return this.zone.equals(offset) ? this : new ZonedDateTime(dateTime, offset, offset);
    }

    //-----------------------------------------------------------------------
    
Gets the LocalDateTime part of this date-time. 
 This returns a LocalDateTime with the same year, month, day and time as this date-time. 
Returns:the local date-time part of this date-time, not null
/**
     * Gets the {@code LocalDateTime} part of this date-time.
     * <p>
     * This returns a {@code LocalDateTime} with the same year, month, day and time
     * as this date-time.
     *
     * @return the local date-time part of this date-time, not null
     */
    @Override  // override for return type
    public LocalDateTime toLocalDateTime() {
        return dateTime;
    }

    //-----------------------------------------------------------------------
    
Gets the LocalDate part of this date-time. 
 This returns a LocalDate with the same year, month and day as this date-time. 
Returns:the date part of this date-time, not null
/**
     * Gets the {@code LocalDate} part of this date-time.
     * <p>
     * This returns a {@code LocalDate} with the same year, month and day
     * as this date-time.
     *
     * @return the date part of this date-time, not null
     */
    @Override  // override for return type
    public LocalDate toLocalDate() {
        return dateTime.toLocalDate();
    }

    
Gets the year field.

 This method returns the primitive int value for the year. 
 The year returned by this method is proleptic as per get(YEAR). To obtain the year-of-era, use get(YEAR_OF_ERA). 
Returns:the year, from MIN_YEAR to MAX_YEAR
/**
     * Gets the year field.
     * <p>
     * This method returns the primitive {@code int} value for the year.
     * <p>
     * The year returned by this method is proleptic as per {@code get(YEAR)}.
     * To obtain the year-of-era, use {@code get(YEAR_OF_ERA)}.
     *
     * @return the year, from MIN_YEAR to MAX_YEAR
     */
    public int getYear() {
        return dateTime.getYear();
    }

    
Gets the month-of-year field from 1 to 12.

 This method returns the month as an int from 1 to 12. Application code is frequently clearer if the enum Month is used by calling getMonth(). 
See Also:
Returns:the month-of-year, from 1 to 12
/**
     * Gets the month-of-year field from 1 to 12.
     * <p>
     * This method returns the month as an {@code int} from 1 to 12.
     * Application code is frequently clearer if the enum {@link Month}
     * is used by calling {@link #getMonth()}.
     *
     * @return the month-of-year, from 1 to 12
     * @see #getMonth()
     */
    public int getMonthValue() {
        return dateTime.getMonthValue();
    }

    
Gets the month-of-year field using the Month enum. 
 This method returns the enum Month for the month. This avoids confusion as to what int values mean. If you need access to the primitive int value then the enum provides the int value. 
See Also:
Returns:the month-of-year, not null
/**
     * Gets the month-of-year field using the {@code Month} enum.
     * <p>
     * This method returns the enum {@link Month} for the month.
     * This avoids confusion as to what {@code int} values mean.
     * If you need access to the primitive {@code int} value then the enum
     * provides the {@link Month#getValue() int value}.
     *
     * @return the month-of-year, not null
     * @see #getMonthValue()
     */
    public Month getMonth() {
        return dateTime.getMonth();
    }

    
Gets the day-of-month field.

 This method returns the primitive int value for the day-of-month. 
Returns:the day-of-month, from 1 to 31
/**
     * Gets the day-of-month field.
     * <p>
     * This method returns the primitive {@code int} value for the day-of-month.
     *
     * @return the day-of-month, from 1 to 31
     */
    public int getDayOfMonth() {
        return dateTime.getDayOfMonth();
    }

    
Gets the day-of-year field.

 This method returns the primitive int value for the day-of-year. 
Returns:the day-of-year, from 1 to 365, or 366 in a leap year
/**
     * Gets the day-of-year field.
     * <p>
     * This method returns the primitive {@code int} value for the day-of-year.
     *
     * @return the day-of-year, from 1 to 365, or 366 in a leap year
     */
    public int getDayOfYear() {
        return dateTime.getDayOfYear();
    }

    
Gets the day-of-week field, which is an enum DayOfWeek. 
 This method returns the enum DayOfWeek for the day-of-week. This avoids confusion as to what int values mean. If you need access to the primitive int value then the enum provides the int value. 
 Additional information can be obtained from the DayOfWeek. This includes textual names of the values. 
Returns:the day-of-week, not null
/**
     * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
     * <p>
     * This method returns the enum {@link DayOfWeek} for the day-of-week.
     * This avoids confusion as to what {@code int} values mean.
     * If you need access to the primitive {@code int} value then the enum
     * provides the {@link DayOfWeek#getValue() int value}.
     * <p>
     * Additional information can be obtained from the {@code DayOfWeek}.
     * This includes textual names of the values.
     *
     * @return the day-of-week, not null
     */
    public DayOfWeek getDayOfWeek() {
        return dateTime.getDayOfWeek();
    }

    //-----------------------------------------------------------------------
    
Gets the LocalTime part of this date-time. 
 This returns a LocalTime with the same hour, minute, second and nanosecond as this date-time. 
Returns:the time part of this date-time, not null
/**
     * Gets the {@code LocalTime} part of this date-time.
     * <p>
     * This returns a {@code LocalTime} with the same hour, minute, second and
     * nanosecond as this date-time.
     *
     * @return the time part of this date-time, not null
     */
    @Override  // override for Javadoc and performance
    public LocalTime toLocalTime() {
        return dateTime.toLocalTime();
    }

    
Gets the hour-of-day field.

Returns:the hour-of-day, from 0 to 23
/**
     * Gets the hour-of-day field.
     *
     * @return the hour-of-day, from 0 to 23
     */
    public int getHour() {
        return dateTime.getHour();
    }

    
Gets the minute-of-hour field.

Returns:the minute-of-hour, from 0 to 59
/**
     * Gets the minute-of-hour field.
     *
     * @return the minute-of-hour, from 0 to 59
     */
    public int getMinute() {
        return dateTime.getMinute();
    }

    
Gets the second-of-minute field.

Returns:the second-of-minute, from 0 to 59
/**
     * Gets the second-of-minute field.
     *
     * @return the second-of-minute, from 0 to 59
     */
    public int getSecond() {
        return dateTime.getSecond();
    }

    
Gets the nano-of-second field.

Returns:the nano-of-second, from 0 to 999,999,999
/**
     * Gets the nano-of-second field.
     *
     * @return the nano-of-second, from 0 to 999,999,999
     */
    public int getNano() {
        return dateTime.getNano();
    }

    //-----------------------------------------------------------------------
    
Returns an adjusted copy of this date-time.

 This returns a ZonedDateTime, based on this one, with the date-time adjusted. The adjustment takes place using the specified adjuster strategy object. Read the documentation of the adjuster to understand what adjustment will be made. 
 A simple adjuster might simply set the one of the fields, such as the year field. A more complex adjuster might set the date to the last day of the month. A selection of common adjustments is provided in TemporalAdjusters. These include finding the "last day of the month" and "next Wednesday". Key date-time classes also implement the TemporalAdjuster interface, such as Month and MonthDay. The adjuster is responsible for handling special cases, such as the varying lengths of month and leap years. 

For example this code returns a date on the last day of July:

 import static java.time.Month.*;
 import static java.time.temporal.TemporalAdjusters.*;
 result = zonedDateTime.with(JULY).with(lastDayOfMonth());



 The classes LocalDate and LocalTime implement TemporalAdjuster, thus this method can be used to change the date, time or offset: 
 result = zonedDateTime.with(date);
 result = zonedDateTime.with(time);



 ZoneOffset also implements TemporalAdjuster however using it as an argument typically has no effect. The offset of a ZonedDateTime is controlled primarily by the time-zone. As such, changing the offset does not generally make sense, because there is only one valid offset for the local date-time and zone. If the zoned date-time is in a daylight savings overlap, then the offset is used to switch between the two valid offsets. In all other cases, the offset is ignored. 
 The result of this method is obtained by invoking the TemporalAdjuster.adjustInto(Temporal) method on the specified adjuster passing this as the argument. 

This instance is immutable and unaffected by this method call.

Params:
  • adjuster – the adjuster to use, not null
Throws:
Returns:a ZonedDateTime based on this with the adjustment made, not null
/**
     * Returns an adjusted copy of this date-time.
     * <p>
     * This returns a {@code ZonedDateTime}, based on this one, with the date-time adjusted.
     * The adjustment takes place using the specified adjuster strategy object.
     * Read the documentation of the adjuster to understand what adjustment will be made.
     * <p>
     * A simple adjuster might simply set the one of the fields, such as the year field.
     * A more complex adjuster might set the date to the last day of the month.
     * A selection of common adjustments is provided in
     * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}.
     * These include finding the "last day of the month" and "next Wednesday".
     * Key date-time classes also implement the {@code TemporalAdjuster} interface,
     * such as {@link Month} and {@link java.time.MonthDay MonthDay}.
     * The adjuster is responsible for handling special cases, such as the varying
     * lengths of month and leap years.
     * <p>
     * For example this code returns a date on the last day of July:
     * <pre>
     *  import static java.time.Month.*;
     *  import static java.time.temporal.TemporalAdjusters.*;
     *
     *  result = zonedDateTime.with(JULY).with(lastDayOfMonth());
     * </pre>
     * <p>
     * The classes {@link LocalDate} and {@link LocalTime} implement {@code TemporalAdjuster},
     * thus this method can be used to change the date, time or offset:
     * <pre>
     *  result = zonedDateTime.with(date);
     *  result = zonedDateTime.with(time);
     * </pre>
     * <p>
     * {@link ZoneOffset} also implements {@code TemporalAdjuster} however using it
     * as an argument typically has no effect. The offset of a {@code ZonedDateTime} is
     * controlled primarily by the time-zone. As such, changing the offset does not generally
     * make sense, because there is only one valid offset for the local date-time and zone.
     * If the zoned date-time is in a daylight savings overlap, then the offset is used
     * to switch between the two valid offsets. In all other cases, the offset is ignored.
     * <p>
     * The result of this method is obtained by invoking the
     * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
     * specified adjuster passing {@code this} as the argument.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param adjuster the adjuster to use, not null
     * @return a {@code ZonedDateTime} based on {@code this} with the adjustment made, not null
     * @throws DateTimeException if the adjustment cannot be made
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public ZonedDateTime with(TemporalAdjuster adjuster) {
        // optimizations
        if (adjuster instanceof LocalDate) {
            return resolveLocal(LocalDateTime.of((LocalDate) adjuster, dateTime.toLocalTime()));
        } else if (adjuster instanceof LocalTime) {
            return resolveLocal(LocalDateTime.of(dateTime.toLocalDate(), (LocalTime) adjuster));
        } else if (adjuster instanceof LocalDateTime) {
            return resolveLocal((LocalDateTime) adjuster);
        } else if (adjuster instanceof OffsetDateTime) {
            OffsetDateTime odt = (OffsetDateTime) adjuster;
            return ofLocal(odt.toLocalDateTime(), zone, odt.getOffset());
        } else if (adjuster instanceof Instant) {
            Instant instant = (Instant) adjuster;
            return create(instant.getEpochSecond(), instant.getNano(), zone);
        } else if (adjuster instanceof ZoneOffset) {
            return resolveOffset((ZoneOffset) adjuster);
        }
        return (ZonedDateTime) adjuster.adjustInto(this);
    }

    
Returns a copy of this date-time with the specified field set to a new value.

 This returns a ZonedDateTime, based on this one, with the value for the specified field changed. This can be used to change any supported field, such as the year, month or day-of-month. If it is not possible to set the value, because the field is not supported or for some other reason, an exception is thrown. 

In some cases, changing the specified field can cause the resulting date-time to become invalid,
such as changing the month from 31st January to February would make the day-of-month invalid.
In cases like this, the field is responsible for resolving the date. Typically it will choose
the previous valid date, which would be the last valid day of February in this example.

 If the field is a ChronoField then the adjustment is implemented here. 
 The INSTANT_SECONDS field will return a date-time with the specified instant. The zone and nano-of-second are unchanged. The result will have an offset derived from the new instant and original zone. If the new instant value is outside the valid range then a DateTimeException will be thrown. 
 The OFFSET_SECONDS field will typically be ignored. The offset of a ZonedDateTime is controlled primarily by the time-zone. As such, changing the offset does not generally make sense, because there is only one valid offset for the local date-time and zone. If the zoned date-time is in a daylight savings overlap, then the offset is used to switch between the two valid offsets. In all other cases, the offset is ignored. If the new offset value is outside the valid range then a DateTimeException will be thrown. 
 The other supported fields will behave as per the matching method on LocalDateTime. The zone is not part of the calculation and will be unchanged. When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 
 All other ChronoField instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.adjustInto(Temporal, long) passing this as the argument. In this case, the field determines whether and how to adjust the instant. 

This instance is immutable and unaffected by this method call.

Params:
  • field –  the field to set in the result, not null
  • newValue –  the new value of the field in the result
Throws:
Returns:a ZonedDateTime based on this with the specified field set, not null
/**
     * Returns a copy of this date-time with the specified field set to a new value.
     * <p>
     * This returns a {@code ZonedDateTime}, based on this one, with the value
     * for the specified field changed.
     * This can be used to change any supported field, such as the year, month or day-of-month.
     * If it is not possible to set the value, because the field is not supported or for
     * some other reason, an exception is thrown.
     * <p>
     * In some cases, changing the specified field can cause the resulting date-time to become invalid,
     * such as changing the month from 31st January to February would make the day-of-month invalid.
     * In cases like this, the field is responsible for resolving the date. Typically it will choose
     * the previous valid date, which would be the last valid day of February in this example.
     * <p>
     * If the field is a {@link ChronoField} then the adjustment is implemented here.
     * <p>
     * The {@code INSTANT_SECONDS} field will return a date-time with the specified instant.
     * The zone and nano-of-second are unchanged.
     * The result will have an offset derived from the new instant and original zone.
     * If the new instant value is outside the valid range then a {@code DateTimeException} will be thrown.
     * <p>
     * The {@code OFFSET_SECONDS} field will typically be ignored.
     * The offset of a {@code ZonedDateTime} is controlled primarily by the time-zone.
     * As such, changing the offset does not generally make sense, because there is only
     * one valid offset for the local date-time and zone.
     * If the zoned date-time is in a daylight savings overlap, then the offset is used
     * to switch between the two valid offsets. In all other cases, the offset is ignored.
     * If the new offset value is outside the valid range then a {@code DateTimeException} will be thrown.
     * <p>
     * The other {@link #isSupported(TemporalField) supported fields} will behave as per
     * the matching method on {@link LocalDateTime#with(TemporalField, long) LocalDateTime}.
     * The zone is not part of the calculation and will be unchanged.
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)}
     * passing {@code this} as the argument. In this case, the field determines
     * whether and how to adjust the instant.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param field  the field to set in the result, not null
     * @param newValue  the new value of the field in the result
     * @return a {@code ZonedDateTime} based on {@code this} with the specified field set, not null
     * @throws DateTimeException if the field cannot be set
     * @throws UnsupportedTemporalTypeException if the field is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public ZonedDateTime with(TemporalField field, long newValue) {
        if (field instanceof ChronoField) {
            ChronoField f = (ChronoField) field;
            switch (f) {
                case INSTANT_SECONDS:
                    return create(newValue, getNano(), zone);
                case OFFSET_SECONDS:
                    ZoneOffset offset = ZoneOffset.ofTotalSeconds(f.checkValidIntValue(newValue));
                    return resolveOffset(offset);
            }
            return resolveLocal(dateTime.with(field, newValue));
        }
        return field.adjustInto(this, newValue);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this ZonedDateTime with the year altered. 
 This operates on the local time-line, changing the year of the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • year –  the year to set in the result, from MIN_YEAR to MAX_YEAR
Throws:
Returns:a ZonedDateTime based on this date-time with the requested year, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the year altered.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#withYear(int) changing the year} of the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param year  the year to set in the result, from MIN_YEAR to MAX_YEAR
     * @return a {@code ZonedDateTime} based on this date-time with the requested year, not null
     * @throws DateTimeException if the year value is invalid
     */
    public ZonedDateTime withYear(int year) {
        return resolveLocal(dateTime.withYear(year));
    }

    
Returns a copy of this ZonedDateTime with the month-of-year altered. 
 This operates on the local time-line, changing the month of the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • month –  the month-of-year to set in the result, from 1 (January) to 12 (December)
Throws:
Returns:a ZonedDateTime based on this date-time with the requested month, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the month-of-year altered.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#withMonth(int) changing the month} of the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param month  the month-of-year to set in the result, from 1 (January) to 12 (December)
     * @return a {@code ZonedDateTime} based on this date-time with the requested month, not null
     * @throws DateTimeException if the month-of-year value is invalid
     */
    public ZonedDateTime withMonth(int month) {
        return resolveLocal(dateTime.withMonth(month));
    }

    
Returns a copy of this ZonedDateTime with the day-of-month altered. 
 This operates on the local time-line, changing the day-of-month of the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • dayOfMonth –  the day-of-month to set in the result, from 1 to 28-31
Throws:
  • DateTimeException – if the day-of-month value is invalid,
 or if the day-of-month is invalid for the month-year
Returns:a ZonedDateTime based on this date-time with the requested day, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the day-of-month altered.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#withDayOfMonth(int) changing the day-of-month} of the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param dayOfMonth  the day-of-month to set in the result, from 1 to 28-31
     * @return a {@code ZonedDateTime} based on this date-time with the requested day, not null
     * @throws DateTimeException if the day-of-month value is invalid,
     *  or if the day-of-month is invalid for the month-year
     */
    public ZonedDateTime withDayOfMonth(int dayOfMonth) {
        return resolveLocal(dateTime.withDayOfMonth(dayOfMonth));
    }

    
Returns a copy of this ZonedDateTime with the day-of-year altered. 
 This operates on the local time-line, changing the day-of-year of the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • dayOfYear –  the day-of-year to set in the result, from 1 to 365-366
Throws:
  • DateTimeException – if the day-of-year value is invalid,
 or if the day-of-year is invalid for the year
Returns:a ZonedDateTime based on this date with the requested day, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the day-of-year altered.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#withDayOfYear(int) changing the day-of-year} of the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param dayOfYear  the day-of-year to set in the result, from 1 to 365-366
     * @return a {@code ZonedDateTime} based on this date with the requested day, not null
     * @throws DateTimeException if the day-of-year value is invalid,
     *  or if the day-of-year is invalid for the year
     */
    public ZonedDateTime withDayOfYear(int dayOfYear) {
        return resolveLocal(dateTime.withDayOfYear(dayOfYear));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this ZonedDateTime with the hour-of-day altered. 
 This operates on the local time-line, changing the time of the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • hour –  the hour-of-day to set in the result, from 0 to 23
Throws:
Returns:a ZonedDateTime based on this date-time with the requested hour, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the hour-of-day altered.
     * <p>
     * This operates on the local time-line,
     * {@linkplain LocalDateTime#withHour(int) changing the time} of the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param hour  the hour-of-day to set in the result, from 0 to 23
     * @return a {@code ZonedDateTime} based on this date-time with the requested hour, not null
     * @throws DateTimeException if the hour value is invalid
     */
    public ZonedDateTime withHour(int hour) {
        return resolveLocal(dateTime.withHour(hour));
    }

    
Returns a copy of this ZonedDateTime with the minute-of-hour altered. 
 This operates on the local time-line, changing the time of the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • minute –  the minute-of-hour to set in the result, from 0 to 59
Throws:
Returns:a ZonedDateTime based on this date-time with the requested minute, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the minute-of-hour altered.
     * <p>
     * This operates on the local time-line,
     * {@linkplain LocalDateTime#withMinute(int) changing the time} of the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param minute  the minute-of-hour to set in the result, from 0 to 59
     * @return a {@code ZonedDateTime} based on this date-time with the requested minute, not null
     * @throws DateTimeException if the minute value is invalid
     */
    public ZonedDateTime withMinute(int minute) {
        return resolveLocal(dateTime.withMinute(minute));
    }

    
Returns a copy of this ZonedDateTime with the second-of-minute altered. 
 This operates on the local time-line, changing the time of the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • second –  the second-of-minute to set in the result, from 0 to 59
Throws:
Returns:a ZonedDateTime based on this date-time with the requested second, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the second-of-minute altered.
     * <p>
     * This operates on the local time-line,
     * {@linkplain LocalDateTime#withSecond(int) changing the time} of the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param second  the second-of-minute to set in the result, from 0 to 59
     * @return a {@code ZonedDateTime} based on this date-time with the requested second, not null
     * @throws DateTimeException if the second value is invalid
     */
    public ZonedDateTime withSecond(int second) {
        return resolveLocal(dateTime.withSecond(second));
    }

    
Returns a copy of this ZonedDateTime with the nano-of-second altered. 
 This operates on the local time-line, changing the time of the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • nanoOfSecond –  the nano-of-second to set in the result, from 0 to 999,999,999
Throws:
Returns:a ZonedDateTime based on this date-time with the requested nanosecond, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the nano-of-second altered.
     * <p>
     * This operates on the local time-line,
     * {@linkplain LocalDateTime#withNano(int) changing the time} of the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param nanoOfSecond  the nano-of-second to set in the result, from 0 to 999,999,999
     * @return a {@code ZonedDateTime} based on this date-time with the requested nanosecond, not null
     * @throws DateTimeException if the nano value is invalid
     */
    public ZonedDateTime withNano(int nanoOfSecond) {
        return resolveLocal(dateTime.withNano(nanoOfSecond));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this ZonedDateTime with the time truncated. 
 Truncation returns a copy of the original date-time with fields smaller than the specified unit set to zero. For example, truncating with the minutes unit will set the second-of-minute and nano-of-second field to zero. 
 The unit must have a duration that divides into the length of a standard day without remainder. This includes all supplied time units on ChronoUnit and DAYS. Other units throw an exception. 
 This operates on the local time-line, truncating the underlying local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • unit –  the unit to truncate to, not null
Throws:
Returns:a ZonedDateTime based on this date-time with the time truncated, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the time truncated.
     * <p>
     * Truncation returns a copy of the original date-time with fields
     * smaller than the specified unit set to zero.
     * For example, truncating with the {@link ChronoUnit#MINUTES minutes} unit
     * will set the second-of-minute and nano-of-second field to zero.
     * <p>
     * The unit must have a {@linkplain TemporalUnit#getDuration() duration}
     * that divides into the length of a standard day without remainder.
     * This includes all supplied time units on {@link ChronoUnit} and
     * {@link ChronoUnit#DAYS DAYS}. Other units throw an exception.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#truncatedTo(TemporalUnit) truncating}
     * the underlying local date-time. This is then converted back to a
     * {@code ZonedDateTime}, using the zone ID to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param unit  the unit to truncate to, not null
     * @return a {@code ZonedDateTime} based on this date-time with the time truncated, not null
     * @throws DateTimeException if unable to truncate
     * @throws UnsupportedTemporalTypeException if the unit is not supported
     */
    public ZonedDateTime truncatedTo(TemporalUnit unit) {
        return resolveLocal(dateTime.truncatedTo(unit));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this date-time with the specified amount added.

 This returns a ZonedDateTime, based on this one, with the specified amount added. The amount is typically Period or Duration but may be any other type implementing the TemporalAmount interface. 
 The calculation is delegated to the amount object by calling TemporalAmount.addTo(Temporal). The amount implementation is free to implement the addition in any way it wishes, however it typically calls back to plus(long, TemporalUnit). Consult the documentation of the amount implementation to determine if it can be successfully added. 

This instance is immutable and unaffected by this method call.

Params:
  • amountToAdd –  the amount to add, not null
Throws:
Returns:a ZonedDateTime based on this date-time with the addition made, not null
/**
     * Returns a copy of this date-time with the specified amount added.
     * <p>
     * This returns a {@code ZonedDateTime}, based on this one, with the specified amount added.
     * The amount is typically {@link Period} or {@link Duration} but may be
     * any other type implementing the {@link TemporalAmount} interface.
     * <p>
     * The calculation is delegated to the amount object by calling
     * {@link TemporalAmount#addTo(Temporal)}. The amount implementation is free
     * to implement the addition in any way it wishes, however it typically
     * calls back to {@link #plus(long, TemporalUnit)}. Consult the documentation
     * of the amount implementation to determine if it can be successfully added.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param amountToAdd  the amount to add, not null
     * @return a {@code ZonedDateTime} based on this date-time with the addition made, not null
     * @throws DateTimeException if the addition cannot be made
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public ZonedDateTime plus(TemporalAmount amountToAdd) {
        if (amountToAdd instanceof Period) {
            Period periodToAdd = (Period) amountToAdd;
            return resolveLocal(dateTime.plus(periodToAdd));
        }
        Objects.requireNonNull(amountToAdd, "amountToAdd");
        return (ZonedDateTime) amountToAdd.addTo(this);
    }

    
Returns a copy of this date-time with the specified amount added.

 This returns a ZonedDateTime, based on this one, with the amount in terms of the unit added. If it is not possible to add the amount, because the unit is not supported or for some other reason, an exception is thrown. 
 If the field is a ChronoUnit then the addition is implemented here. The zone is not part of the calculation and will be unchanged in the result. The calculation for date and time units differ. 
 Date units operate on the local time-line. The period is first added to the local date-time, then converted back to a zoned date-time using the zone ID. The conversion uses ofLocal(LocalDateTime, ZoneId, ZoneOffset) with the offset before the addition. 
 Time units operate on the instant time-line. The period is first added to the local date-time, then converted back to a zoned date-time using the zone ID. The conversion uses ofInstant(LocalDateTime, ZoneOffset, ZoneId) with the offset before the addition. 
 If the field is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.addTo(Temporal, long) passing this as the argument. In this case, the unit determines whether and how to perform the addition. 

This instance is immutable and unaffected by this method call.

Params:
  • amountToAdd –  the amount of the unit to add to the result, may be negative
  • unit –  the unit of the amount to add, not null
Throws:
Returns:a ZonedDateTime based on this date-time with the specified amount added, not null
/**
     * Returns a copy of this date-time with the specified amount added.
     * <p>
     * This returns a {@code ZonedDateTime}, based on this one, with the amount
     * in terms of the unit added. If it is not possible to add the amount, because the
     * unit is not supported or for some other reason, an exception is thrown.
     * <p>
     * If the field is a {@link ChronoUnit} then the addition is implemented here.
     * The zone is not part of the calculation and will be unchanged in the result.
     * The calculation for date and time units differ.
     * <p>
     * Date units operate on the local time-line.
     * The period is first added to the local date-time, then converted back
     * to a zoned date-time using the zone ID.
     * The conversion uses {@link #ofLocal(LocalDateTime, ZoneId, ZoneOffset)}
     * with the offset before the addition.
     * <p>
     * Time units operate on the instant time-line.
     * The period is first added to the local date-time, then converted back to
     * a zoned date-time using the zone ID.
     * The conversion uses {@link #ofInstant(LocalDateTime, ZoneOffset, ZoneId)}
     * with the offset before the addition.
     * <p>
     * If the field is not a {@code ChronoUnit}, then the result of this method
     * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
     * passing {@code this} as the argument. In this case, the unit determines
     * whether and how to perform the addition.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param amountToAdd  the amount of the unit to add to the result, may be negative
     * @param unit  the unit of the amount to add, not null
     * @return a {@code ZonedDateTime} based on this date-time with the specified amount added, not null
     * @throws DateTimeException if the addition cannot be made
     * @throws UnsupportedTemporalTypeException if the unit is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public ZonedDateTime plus(long amountToAdd, TemporalUnit unit) {
        if (unit instanceof ChronoUnit) {
            if (unit.isDateBased()) {
                return resolveLocal(dateTime.plus(amountToAdd, unit));
            } else {
                return resolveInstant(dateTime.plus(amountToAdd, unit));
            }
        }
        return unit.addTo(this, amountToAdd);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this ZonedDateTime with the specified number of years added. 
 This operates on the local time-line, adding years to the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • years –  the years to add, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the years added, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of years added.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#plusYears(long) adding years} to the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param years  the years to add, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the years added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime plusYears(long years) {
        return resolveLocal(dateTime.plusYears(years));
    }

    
Returns a copy of this ZonedDateTime with the specified number of months added. 
 This operates on the local time-line, adding months to the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • months –  the months to add, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the months added, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of months added.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#plusMonths(long) adding months} to the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param months  the months to add, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the months added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime plusMonths(long months) {
        return resolveLocal(dateTime.plusMonths(months));
    }

    
Returns a copy of this ZonedDateTime with the specified number of weeks added. 
 This operates on the local time-line, adding weeks to the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • weeks –  the weeks to add, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the weeks added, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of weeks added.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#plusWeeks(long) adding weeks} to the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param weeks  the weeks to add, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the weeks added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime plusWeeks(long weeks) {
        return resolveLocal(dateTime.plusWeeks(weeks));
    }

    
Returns a copy of this ZonedDateTime with the specified number of days added. 
 This operates on the local time-line, adding days to the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • days –  the days to add, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the days added, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of days added.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#plusDays(long) adding days} to the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param days  the days to add, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the days added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime plusDays(long days) {
        return resolveLocal(dateTime.plusDays(days));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this ZonedDateTime with the specified number of hours added. 

This operates on the instant time-line, such that adding one hour will
always be a duration of one hour later.
This may cause the local date-time to change by an amount other than one hour.
Note that this is a different approach to that used by days, months and years,
thus adding one day is not the same as adding 24 hours.


For example, consider a time-zone, such as 'Europe/Paris', where the
Autumn DST cutover means that the local times 02:00 to 02:59 occur twice
changing from offset +02:00 in summer to +01:00 in winter.

    

  • Adding one hour to 01:30+02:00 will result in 02:30+02:00
    (both in summer time)

  • Adding one hour to 02:30+02:00 will result in 02:30+01:00
    (moving from summer to winter time)

  • Adding one hour to 02:30+01:00 will result in 03:30+01:00
    (both in winter time)

  • Adding three hours to 01:30+02:00 will result in 03:30+01:00
    (moving from summer to winter time)




This instance is immutable and unaffected by this method call.

Params:
  • hours –  the hours to add, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the hours added, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of hours added.
     * <p>
     * This operates on the instant time-line, such that adding one hour will
     * always be a duration of one hour later.
     * This may cause the local date-time to change by an amount other than one hour.
     * Note that this is a different approach to that used by days, months and years,
     * thus adding one day is not the same as adding 24 hours.
     * <p>
     * For example, consider a time-zone, such as 'Europe/Paris', where the
     * Autumn DST cutover means that the local times 02:00 to 02:59 occur twice
     * changing from offset +02:00 in summer to +01:00 in winter.
     * <ul>
     * <li>Adding one hour to 01:30+02:00 will result in 02:30+02:00
     *     (both in summer time)
     * <li>Adding one hour to 02:30+02:00 will result in 02:30+01:00
     *     (moving from summer to winter time)
     * <li>Adding one hour to 02:30+01:00 will result in 03:30+01:00
     *     (both in winter time)
     * <li>Adding three hours to 01:30+02:00 will result in 03:30+01:00
     *     (moving from summer to winter time)
     * </ul>
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param hours  the hours to add, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the hours added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime plusHours(long hours) {
        return resolveInstant(dateTime.plusHours(hours));
    }

    
Returns a copy of this ZonedDateTime with the specified number of minutes added. 

This operates on the instant time-line, such that adding one minute will
always be a duration of one minute later.
This may cause the local date-time to change by an amount other than one minute.
Note that this is a different approach to that used by days, months and years.


This instance is immutable and unaffected by this method call.

Params:
  • minutes –  the minutes to add, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the minutes added, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of minutes added.
     * <p>
     * This operates on the instant time-line, such that adding one minute will
     * always be a duration of one minute later.
     * This may cause the local date-time to change by an amount other than one minute.
     * Note that this is a different approach to that used by days, months and years.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param minutes  the minutes to add, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the minutes added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime plusMinutes(long minutes) {
        return resolveInstant(dateTime.plusMinutes(minutes));
    }

    
Returns a copy of this ZonedDateTime with the specified number of seconds added. 

This operates on the instant time-line, such that adding one second will
always be a duration of one second later.
This may cause the local date-time to change by an amount other than one second.
Note that this is a different approach to that used by days, months and years.


This instance is immutable and unaffected by this method call.

Params:
  • seconds –  the seconds to add, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the seconds added, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of seconds added.
     * <p>
     * This operates on the instant time-line, such that adding one second will
     * always be a duration of one second later.
     * This may cause the local date-time to change by an amount other than one second.
     * Note that this is a different approach to that used by days, months and years.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param seconds  the seconds to add, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the seconds added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime plusSeconds(long seconds) {
        return resolveInstant(dateTime.plusSeconds(seconds));
    }

    
Returns a copy of this ZonedDateTime with the specified number of nanoseconds added. 

This operates on the instant time-line, such that adding one nano will
always be a duration of one nano later.
This may cause the local date-time to change by an amount other than one nano.
Note that this is a different approach to that used by days, months and years.


This instance is immutable and unaffected by this method call.

Params:
  • nanos –  the nanos to add, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the nanoseconds added, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of nanoseconds added.
     * <p>
     * This operates on the instant time-line, such that adding one nano will
     * always be a duration of one nano later.
     * This may cause the local date-time to change by an amount other than one nano.
     * Note that this is a different approach to that used by days, months and years.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param nanos  the nanos to add, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the nanoseconds added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime plusNanos(long nanos) {
        return resolveInstant(dateTime.plusNanos(nanos));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this date-time with the specified amount subtracted.

 This returns a ZonedDateTime, based on this one, with the specified amount subtracted. The amount is typically Period or Duration but may be any other type implementing the TemporalAmount interface. 
 The calculation is delegated to the amount object by calling TemporalAmount.subtractFrom(Temporal). The amount implementation is free to implement the subtraction in any way it wishes, however it typically calls back to minus(long, TemporalUnit). Consult the documentation of the amount implementation to determine if it can be successfully subtracted. 

This instance is immutable and unaffected by this method call.

Params:
  • amountToSubtract –  the amount to subtract, not null
Throws:
Returns:a ZonedDateTime based on this date-time with the subtraction made, not null
/**
     * Returns a copy of this date-time with the specified amount subtracted.
     * <p>
     * This returns a {@code ZonedDateTime}, based on this one, with the specified amount subtracted.
     * The amount is typically {@link Period} or {@link Duration} but may be
     * any other type implementing the {@link TemporalAmount} interface.
     * <p>
     * The calculation is delegated to the amount object by calling
     * {@link TemporalAmount#subtractFrom(Temporal)}. The amount implementation is free
     * to implement the subtraction in any way it wishes, however it typically
     * calls back to {@link #minus(long, TemporalUnit)}. Consult the documentation
     * of the amount implementation to determine if it can be successfully subtracted.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param amountToSubtract  the amount to subtract, not null
     * @return a {@code ZonedDateTime} based on this date-time with the subtraction made, not null
     * @throws DateTimeException if the subtraction cannot be made
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public ZonedDateTime minus(TemporalAmount amountToSubtract) {
        if (amountToSubtract instanceof Period) {
            Period periodToSubtract = (Period) amountToSubtract;
            return resolveLocal(dateTime.minus(periodToSubtract));
        }
        Objects.requireNonNull(amountToSubtract, "amountToSubtract");
        return (ZonedDateTime) amountToSubtract.subtractFrom(this);
    }

    
Returns a copy of this date-time with the specified amount subtracted.

 This returns a ZonedDateTime, based on this one, with the amount in terms of the unit subtracted. If it is not possible to subtract the amount, because the unit is not supported or for some other reason, an exception is thrown. 

The calculation for date and time units differ.

 Date units operate on the local time-line. The period is first subtracted from the local date-time, then converted back to a zoned date-time using the zone ID. The conversion uses ofLocal(LocalDateTime, ZoneId, ZoneOffset) with the offset before the subtraction. 
 Time units operate on the instant time-line. The period is first subtracted from the local date-time, then converted back to a zoned date-time using the zone ID. The conversion uses ofInstant(LocalDateTime, ZoneOffset, ZoneId) with the offset before the subtraction. 
 This method is equivalent to plus(long, TemporalUnit) with the amount negated. See that method for a full description of how addition, and thus subtraction, works. 

This instance is immutable and unaffected by this method call.

Params:
  • amountToSubtract –  the amount of the unit to subtract from the result, may be negative
  • unit –  the unit of the amount to subtract, not null
Throws:
Returns:a ZonedDateTime based on this date-time with the specified amount subtracted, not null
/**
     * Returns a copy of this date-time with the specified amount subtracted.
     * <p>
     * This returns a {@code ZonedDateTime}, based on this one, with the amount
     * in terms of the unit subtracted. If it is not possible to subtract the amount,
     * because the unit is not supported or for some other reason, an exception is thrown.
     * <p>
     * The calculation for date and time units differ.
     * <p>
     * Date units operate on the local time-line.
     * The period is first subtracted from the local date-time, then converted back
     * to a zoned date-time using the zone ID.
     * The conversion uses {@link #ofLocal(LocalDateTime, ZoneId, ZoneOffset)}
     * with the offset before the subtraction.
     * <p>
     * Time units operate on the instant time-line.
     * The period is first subtracted from the local date-time, then converted back to
     * a zoned date-time using the zone ID.
     * The conversion uses {@link #ofInstant(LocalDateTime, ZoneOffset, ZoneId)}
     * with the offset before the subtraction.
     * <p>
     * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
     * See that method for a full description of how addition, and thus subtraction, works.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param amountToSubtract  the amount of the unit to subtract from the result, may be negative
     * @param unit  the unit of the amount to subtract, not null
     * @return a {@code ZonedDateTime} based on this date-time with the specified amount subtracted, not null
     * @throws DateTimeException if the subtraction cannot be made
     * @throws UnsupportedTemporalTypeException if the unit is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public ZonedDateTime minus(long amountToSubtract, TemporalUnit unit) {
        return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this ZonedDateTime with the specified number of years subtracted. 
 This operates on the local time-line, subtracting years to the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • years –  the years to subtract, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the years subtracted, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of years subtracted.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#minusYears(long) subtracting years} to the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param years  the years to subtract, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the years subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime minusYears(long years) {
        return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
    }

    
Returns a copy of this ZonedDateTime with the specified number of months subtracted. 
 This operates on the local time-line, subtracting months to the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • months –  the months to subtract, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the months subtracted, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of months subtracted.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#minusMonths(long) subtracting months} to the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param months  the months to subtract, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the months subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime minusMonths(long months) {
        return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
    }

    
Returns a copy of this ZonedDateTime with the specified number of weeks subtracted. 
 This operates on the local time-line, subtracting weeks to the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • weeks –  the weeks to subtract, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the weeks subtracted, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of weeks subtracted.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#minusWeeks(long) subtracting weeks} to the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param weeks  the weeks to subtract, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the weeks subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime minusWeeks(long weeks) {
        return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
    }

    
Returns a copy of this ZonedDateTime with the specified number of days subtracted. 
 This operates on the local time-line, subtracting days to the local date-time. This is then converted back to a ZonedDateTime, using the zone ID to obtain the offset. 
 When converting back to ZonedDateTime, if the local date-time is in an overlap, then the offset will be retained if possible, otherwise the earlier offset will be used. If in a gap, the local date-time will be adjusted forward by the length of the gap. 

This instance is immutable and unaffected by this method call.

Params:
  • days –  the days to subtract, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the days subtracted, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of days subtracted.
     * <p>
     * This operates on the local time-line,
     * {@link LocalDateTime#minusDays(long) subtracting days} to the local date-time.
     * This is then converted back to a {@code ZonedDateTime}, using the zone ID
     * to obtain the offset.
     * <p>
     * When converting back to {@code ZonedDateTime}, if the local date-time is in an overlap,
     * then the offset will be retained if possible, otherwise the earlier offset will be used.
     * If in a gap, the local date-time will be adjusted forward by the length of the gap.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param days  the days to subtract, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the days subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime minusDays(long days) {
        return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this ZonedDateTime with the specified number of hours subtracted. 

This operates on the instant time-line, such that subtracting one hour will
always be a duration of one hour earlier.
This may cause the local date-time to change by an amount other than one hour.
Note that this is a different approach to that used by days, months and years,
thus subtracting one day is not the same as adding 24 hours.


For example, consider a time-zone, such as 'Europe/Paris', where the
Autumn DST cutover means that the local times 02:00 to 02:59 occur twice
changing from offset +02:00 in summer to +01:00 in winter.

    

  • Subtracting one hour from 03:30+01:00 will result in 02:30+01:00
    (both in winter time)

  • Subtracting one hour from 02:30+01:00 will result in 02:30+02:00
    (moving from winter to summer time)

  • Subtracting one hour from 02:30+02:00 will result in 01:30+02:00
    (both in summer time)

  • Subtracting three hours from 03:30+01:00 will result in 01:30+02:00
    (moving from winter to summer time)




This instance is immutable and unaffected by this method call.

Params:
  • hours –  the hours to subtract, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the hours subtracted, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of hours subtracted.
     * <p>
     * This operates on the instant time-line, such that subtracting one hour will
     * always be a duration of one hour earlier.
     * This may cause the local date-time to change by an amount other than one hour.
     * Note that this is a different approach to that used by days, months and years,
     * thus subtracting one day is not the same as adding 24 hours.
     * <p>
     * For example, consider a time-zone, such as 'Europe/Paris', where the
     * Autumn DST cutover means that the local times 02:00 to 02:59 occur twice
     * changing from offset +02:00 in summer to +01:00 in winter.
     * <ul>
     * <li>Subtracting one hour from 03:30+01:00 will result in 02:30+01:00
     *     (both in winter time)
     * <li>Subtracting one hour from 02:30+01:00 will result in 02:30+02:00
     *     (moving from winter to summer time)
     * <li>Subtracting one hour from 02:30+02:00 will result in 01:30+02:00
     *     (both in summer time)
     * <li>Subtracting three hours from 03:30+01:00 will result in 01:30+02:00
     *     (moving from winter to summer time)
     * </ul>
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param hours  the hours to subtract, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the hours subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime minusHours(long hours) {
        return (hours == Long.MIN_VALUE ? plusHours(Long.MAX_VALUE).plusHours(1) : plusHours(-hours));
    }

    
Returns a copy of this ZonedDateTime with the specified number of minutes subtracted. 

This operates on the instant time-line, such that subtracting one minute will
always be a duration of one minute earlier.
This may cause the local date-time to change by an amount other than one minute.
Note that this is a different approach to that used by days, months and years.


This instance is immutable and unaffected by this method call.

Params:
  • minutes –  the minutes to subtract, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the minutes subtracted, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of minutes subtracted.
     * <p>
     * This operates on the instant time-line, such that subtracting one minute will
     * always be a duration of one minute earlier.
     * This may cause the local date-time to change by an amount other than one minute.
     * Note that this is a different approach to that used by days, months and years.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param minutes  the minutes to subtract, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the minutes subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime minusMinutes(long minutes) {
        return (minutes == Long.MIN_VALUE ? plusMinutes(Long.MAX_VALUE).plusMinutes(1) : plusMinutes(-minutes));
    }

    
Returns a copy of this ZonedDateTime with the specified number of seconds subtracted. 

This operates on the instant time-line, such that subtracting one second will
always be a duration of one second earlier.
This may cause the local date-time to change by an amount other than one second.
Note that this is a different approach to that used by days, months and years.


This instance is immutable and unaffected by this method call.

Params:
  • seconds –  the seconds to subtract, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the seconds subtracted, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of seconds subtracted.
     * <p>
     * This operates on the instant time-line, such that subtracting one second will
     * always be a duration of one second earlier.
     * This may cause the local date-time to change by an amount other than one second.
     * Note that this is a different approach to that used by days, months and years.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param seconds  the seconds to subtract, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the seconds subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime minusSeconds(long seconds) {
        return (seconds == Long.MIN_VALUE ? plusSeconds(Long.MAX_VALUE).plusSeconds(1) : plusSeconds(-seconds));
    }

    
Returns a copy of this ZonedDateTime with the specified number of nanoseconds subtracted. 

This operates on the instant time-line, such that subtracting one nano will
always be a duration of one nano earlier.
This may cause the local date-time to change by an amount other than one nano.
Note that this is a different approach to that used by days, months and years.


This instance is immutable and unaffected by this method call.

Params:
  • nanos –  the nanos to subtract, may be negative
Throws:
Returns:a ZonedDateTime based on this date-time with the nanoseconds subtracted, not null
/**
     * Returns a copy of this {@code ZonedDateTime} with the specified number of nanoseconds subtracted.
     * <p>
     * This operates on the instant time-line, such that subtracting one nano will
     * always be a duration of one nano earlier.
     * This may cause the local date-time to change by an amount other than one nano.
     * Note that this is a different approach to that used by days, months and years.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param nanos  the nanos to subtract, may be negative
     * @return a {@code ZonedDateTime} based on this date-time with the nanoseconds subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public ZonedDateTime minusNanos(long nanos) {
        return (nanos == Long.MIN_VALUE ? plusNanos(Long.MAX_VALUE).plusNanos(1) : plusNanos(-nanos));
    }

    //-----------------------------------------------------------------------
    
Queries this date-time using the specified query.

 This queries this date-time using the specified query strategy object. The TemporalQuery object defines the logic to be used to obtain the result. Read the documentation of the query to understand what the result of this method will be. 
 The result of this method is obtained by invoking the TemporalQuery.queryFrom(TemporalAccessor) method on the specified query passing this as the argument. 
Params:
  • query –  the query to invoke, not null
Type parameters:
  • <R> – the type of the result
Throws:
Returns:the query result, null may be returned (defined by the query)
/**
     * Queries this date-time using the specified query.
     * <p>
     * This queries this date-time using the specified query strategy object.
     * The {@code TemporalQuery} object defines the logic to be used to
     * obtain the result. Read the documentation of the query to understand
     * what the result of this method will be.
     * <p>
     * The result of this method is obtained by invoking the
     * {@link TemporalQuery#queryFrom(TemporalAccessor)} method on the
     * specified query passing {@code this} as the argument.
     *
     * @param <R> the type of the result
     * @param query  the query to invoke, not null
     * @return the query result, null may be returned (defined by the query)
     * @throws DateTimeException if unable to query (defined by the query)
     * @throws ArithmeticException if numeric overflow occurs (defined by the query)
     */
    @SuppressWarnings("unchecked")
    @Override  // override for Javadoc
    public <R> R query(TemporalQuery<R> query) {
        if (query == TemporalQueries.localDate()) {
            return (R) toLocalDate();
        }
        return ChronoZonedDateTime.super.query(query);
    }

    
Calculates the amount of time until another date-time in terms of the specified unit.

 This calculates the amount of time between two ZonedDateTime objects in terms of a single TemporalUnit. The start and end points are this and the specified date-time. The result will be negative if the end is before the start. For example, the amount in days between two date-times can be calculated using startDateTime.until(endDateTime, DAYS). 
 The Temporal passed to this method is converted to a ZonedDateTime using from(TemporalAccessor). If the time-zone differs between the two zoned date-times, the specified end date-time is normalized to have the same zone as this date-time. 

The calculation returns a whole number, representing the number of
complete units between the two date-times.
For example, the amount in months between 2012-06-15T00:00Z and 2012-08-14T23:59Z
will only be one month as it is one minute short of two months.

 There are two equivalent ways of using this method. The first is to invoke this method. The second is to use TemporalUnit.between(Temporal, Temporal): 
  // these two lines are equivalent
  amount = start.until(end, MONTHS);
  amount = MONTHS.between(start, end);


The choice should be made based on which makes the code more readable.

 The calculation is implemented in this method for ChronoUnit. The units NANOS, MICROS, MILLIS, SECONDS, MINUTES, HOURS and HALF_DAYS, DAYS, WEEKS, MONTHS, YEARS, DECADES, CENTURIES, MILLENNIA and ERAS are supported. Other ChronoUnit values will throw an exception. 

The calculation for date and time units differ.


Date units operate on the local time-line, using the local date-time.
For example, the period from noon on day 1 to noon the following day
in days will always be counted as exactly one day, irrespective of whether
there was a daylight savings change or not.


Time units operate on the instant time-line.
The calculation effectively converts both zoned date-times to instants
and then calculates the period between the instants.
For example, the period from noon on day 1 to noon the following day
in hours may be 23, 24 or 25 hours (or some other amount) depending on
whether there was a daylight savings change or not.

 If the unit is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.between(Temporal, Temporal) passing this as the first argument and the converted input temporal as the second argument. 

This instance is immutable and unaffected by this method call.

Params:
  • endExclusive –  the end date, exclusive, which is converted to a ZonedDateTime, not null
  • unit –  the unit to measure the amount in, not null
Throws:
Returns:the amount of time between this date-time and the end date-time
/**
     * Calculates the amount of time until another date-time in terms of the specified unit.
     * <p>
     * This calculates the amount of time between two {@code ZonedDateTime}
     * objects in terms of a single {@code TemporalUnit}.
     * The start and end points are {@code this} and the specified date-time.
     * The result will be negative if the end is before the start.
     * For example, the amount in days between two date-times can be calculated
     * using {@code startDateTime.until(endDateTime, DAYS)}.
     * <p>
     * The {@code Temporal} passed to this method is converted to a
     * {@code ZonedDateTime} using {@link #from(TemporalAccessor)}.
     * If the time-zone differs between the two zoned date-times, the specified
     * end date-time is normalized to have the same zone as this date-time.
     * <p>
     * The calculation returns a whole number, representing the number of
     * complete units between the two date-times.
     * For example, the amount in months between 2012-06-15T00:00Z and 2012-08-14T23:59Z
     * will only be one month as it is one minute short of two months.
     * <p>
     * There are two equivalent ways of using this method.
     * The first is to invoke this method.
     * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
     * <pre>
     *   // these two lines are equivalent
     *   amount = start.until(end, MONTHS);
     *   amount = MONTHS.between(start, end);
     * </pre>
     * The choice should be made based on which makes the code more readable.
     * <p>
     * The calculation is implemented in this method for {@link ChronoUnit}.
     * The units {@code NANOS}, {@code MICROS}, {@code MILLIS}, {@code SECONDS},
     * {@code MINUTES}, {@code HOURS} and {@code HALF_DAYS}, {@code DAYS},
     * {@code WEEKS}, {@code MONTHS}, {@code YEARS}, {@code DECADES},
     * {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS} are supported.
     * Other {@code ChronoUnit} values will throw an exception.
     * <p>
     * The calculation for date and time units differ.
     * <p>
     * Date units operate on the local time-line, using the local date-time.
     * For example, the period from noon on day 1 to noon the following day
     * in days will always be counted as exactly one day, irrespective of whether
     * there was a daylight savings change or not.
     * <p>
     * Time units operate on the instant time-line.
     * The calculation effectively converts both zoned date-times to instants
     * and then calculates the period between the instants.
     * For example, the period from noon on day 1 to noon the following day
     * in hours may be 23, 24 or 25 hours (or some other amount) depending on
     * whether there was a daylight savings change or not.
     * <p>
     * If the unit is not a {@code ChronoUnit}, then the result of this method
     * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
     * passing {@code this} as the first argument and the converted input temporal
     * as the second argument.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param endExclusive  the end date, exclusive, which is converted to a {@code ZonedDateTime}, not null
     * @param unit  the unit to measure the amount in, not null
     * @return the amount of time between this date-time and the end date-time
     * @throws DateTimeException if the amount cannot be calculated, or the end
     *  temporal cannot be converted to a {@code ZonedDateTime}
     * @throws UnsupportedTemporalTypeException if the unit is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public long until(Temporal endExclusive, TemporalUnit unit) {
        ZonedDateTime end = ZonedDateTime.from(endExclusive);
        if (unit instanceof ChronoUnit) {
            end = end.withZoneSameInstant(zone);
            if (unit.isDateBased()) {
                return dateTime.until(end.dateTime, unit);
            } else {
                return toOffsetDateTime().until(end.toOffsetDateTime(), unit);
            }
        }
        return unit.between(this, end);
    }

    
Formats this date-time using the specified formatter.


This date-time will be passed to the formatter to produce a string.

Params:
  • formatter –  the formatter to use, not null
Throws:
Returns:the formatted date-time string, not null
/**
     * Formats this date-time using the specified formatter.
     * <p>
     * This date-time will be passed to the formatter to produce a string.
     *
     * @param formatter  the formatter to use, not null
     * @return the formatted date-time string, not null
     * @throws DateTimeException if an error occurs during printing
     */
    @Override  // override for Javadoc and performance
    public String format(DateTimeFormatter formatter) {
        Objects.requireNonNull(formatter, "formatter");
        return formatter.format(this);
    }

    //-----------------------------------------------------------------------
    
Converts this date-time to an OffsetDateTime. 

This creates an offset date-time using the local date-time and offset.
The zone ID is ignored.

Returns:an offset date-time representing the same local date-time and offset, not null
/**
     * Converts this date-time to an {@code OffsetDateTime}.
     * <p>
     * This creates an offset date-time using the local date-time and offset.
     * The zone ID is ignored.
     *
     * @return an offset date-time representing the same local date-time and offset, not null
     */
    public OffsetDateTime toOffsetDateTime() {
        return OffsetDateTime.of(dateTime, offset);
    }

    //-----------------------------------------------------------------------
    
Checks if this date-time is equal to another date-time.

 The comparison is based on the offset date-time and the zone. Only objects of type ZonedDateTime are compared, other types return false. 
Params:
  • obj –  the object to check, null returns false
Returns:true if this is equal to the other date-time
/**
     * Checks if this date-time is equal to another date-time.
     * <p>
     * The comparison is based on the offset date-time and the zone.
     * Only objects of type {@code ZonedDateTime} are compared, other types return false.
     *
     * @param obj  the object to check, null returns false
     * @return true if this is equal to the other date-time
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj instanceof ZonedDateTime) {
            ZonedDateTime other = (ZonedDateTime) obj;
            return dateTime.equals(other.dateTime) &&
                offset.equals(other.offset) &&
                zone.equals(other.zone);
        }
        return false;
    }

    
A hash code for this date-time.

Returns:a suitable hash code
/**
     * A hash code for this date-time.
     *
     * @return a suitable hash code
     */
    @Override
    public int hashCode() {
        return dateTime.hashCode() ^ offset.hashCode() ^ Integer.rotateLeft(zone.hashCode(), 3);
    }

    //-----------------------------------------------------------------------
    
Outputs this date-time as a String, such as 2007-12-03T10:15:30+01:00[Europe/Paris]. 
 The format consists of the LocalDateTime followed by the ZoneOffset. If the ZoneId is not the same as the offset, then the ID is output. The output is compatible with ISO-8601 if the offset and ID are the same. 
Returns:a string representation of this date-time, not null
/**
     * Outputs this date-time as a {@code String}, such as
     * {@code 2007-12-03T10:15:30+01:00[Europe/Paris]}.
     * <p>
     * The format consists of the {@code LocalDateTime} followed by the {@code ZoneOffset}.
     * If the {@code ZoneId} is not the same as the offset, then the ID is output.
     * The output is compatible with ISO-8601 if the offset and ID are the same.
     *
     * @return a string representation of this date-time, not null
     */
    @Override  // override for Javadoc
    public String toString() {
        String str = dateTime.toString() + offset.toString();
        if (offset != zone) {
            str += '[' + zone.toString() + ']';
        }
        return str;
    }

    //-----------------------------------------------------------------------
    
Writes the object using a
dedicated serialized form.

@serialData

 out.writeByte(6);  // identifies a ZonedDateTime
 // the dateTime excluding the one byte header
 // the offset excluding the one byte header
 // the zone ID excluding the one byte header

Returns:the instance of Ser, not null
/**
     * Writes the object using a
     * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
     * @serialData
     * <pre>
     *  out.writeByte(6);  // identifies a ZonedDateTime
     *  // the <a href="../../serialized-form.html#java.time.LocalDateTime">dateTime</a> excluding the one byte header
     *  // the <a href="../../serialized-form.html#java.time.ZoneOffset">offset</a> excluding the one byte header
     *  // the <a href="../../serialized-form.html#java.time.ZoneId">zone ID</a> excluding the one byte header
     * </pre>
     *
     * @return the instance of {@code Ser}, not null
     */
    private Object writeReplace() {
        return new Ser(Ser.ZONE_DATE_TIME_TYPE, this);
    }

    
Defend against malicious streams.

Params:
  • s – the stream to read
Throws:
/**
     * Defend against malicious streams.
     *
     * @param s the stream to read
     * @throws InvalidObjectException always
     */
    private void readObject(ObjectInputStream s) throws InvalidObjectException {
        throw new InvalidObjectException("Deserialization via serialization delegate");
    }

    void writeExternal(DataOutput out) throws IOException {
        dateTime.writeExternal(out);
        offset.writeExternal(out);
        zone.write(out);
    }

    static ZonedDateTime readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        LocalDateTime dateTime = LocalDateTime.readExternal(in);
        ZoneOffset offset = ZoneOffset.readExternal(in);
        ZoneId zone = (ZoneId) Ser.read(in);
        return ZonedDateTime.ofLenient(dateTime, offset, zone);
    }

}