https://openjdk.java.net/ 
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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
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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
 * accompanied this code).
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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,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package java.time;

import static java.time.LocalTime.HOURS_PER_DAY;
import static java.time.LocalTime.MICROS_PER_DAY;
import static java.time.LocalTime.MILLIS_PER_DAY;
import static java.time.LocalTime.MINUTES_PER_DAY;
import static java.time.LocalTime.NANOS_PER_DAY;
import static java.time.LocalTime.NANOS_PER_HOUR;
import static java.time.LocalTime.NANOS_PER_MINUTE;
import static java.time.LocalTime.NANOS_PER_SECOND;
import static java.time.LocalTime.SECONDS_PER_DAY;
import static java.time.temporal.ChronoField.NANO_OF_SECOND;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.time.chrono.ChronoLocalDateTime;
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.ZoneRules;
import java.util.Objects;


A date-time without a time-zone in the ISO-8601 calendar system, such as 2007-12-03T10:15:30. 
 LocalDateTime is an immutable date-time object that represents a date-time, often viewed as year-month-day-hour-minute-second. Other date and time fields, such as day-of-year, day-of-week and week-of-year, can also be accessed. Time is represented to nanosecond precision. For example, the value "2nd October 2007 at 13:45.30.123456789" can be stored in a LocalDateTime. 

This class does not store or represent a time-zone.
Instead, it is a description of the date, as used for birthdays, combined with
the local time as seen on a wall clock.
It cannot represent an instant on the time-line without additional information
such as an offset or time-zone.


The ISO-8601 calendar system is the modern civil calendar system used today
in most of the world. It is equivalent to the proleptic Gregorian calendar
system, in which today's rules for leap years are applied for all time.
For most applications written today, the ISO-8601 rules are entirely suitable.
However, any application that makes use of historical dates, and requires them
to be accurate will find the ISO-8601 approach unsuitable.


This is a value-based class; use of identity-sensitive operations (including reference equality (==), identity hash code, or synchronization) on instances of LocalDateTime may have unpredictable results and should be avoided. The equals method should be used for comparisons. 
Implementation Requirements:
This class is immutable and thread-safe.
Since:1.8
/**
 * A date-time without a time-zone in the ISO-8601 calendar system,
 * such as {@code 2007-12-03T10:15:30}.
 * <p>
 * {@code LocalDateTime} is an immutable date-time object that represents a date-time,
 * often viewed as year-month-day-hour-minute-second. Other date and time fields,
 * such as day-of-year, day-of-week and week-of-year, can also be accessed.
 * Time is represented to nanosecond precision.
 * For example, the value "2nd October 2007 at 13:45.30.123456789" can be
 * stored in a {@code LocalDateTime}.
 * <p>
 * This class does not store or represent a time-zone.
 * Instead, it is a description of the date, as used for birthdays, combined with
 * the local time as seen on a wall clock.
 * It cannot represent an instant on the time-line without additional information
 * such as an offset or time-zone.
 * <p>
 * The ISO-8601 calendar system is the modern civil calendar system used today
 * in most of the world. It is equivalent to the proleptic Gregorian calendar
 * system, in which today's rules for leap years are applied for all time.
 * For most applications written today, the ISO-8601 rules are entirely suitable.
 * However, any application that makes use of historical dates, and requires them
 * to be accurate will find the ISO-8601 approach unsuitable.
 *
 * <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 LocalDateTime} may have unpredictable results and should be avoided.
 * The {@code equals} method should be used for comparisons.
 *
 * @implSpec
 * This class is immutable and thread-safe.
 *
 * @since 1.8
 */
public final class LocalDateTime
        implements Temporal, TemporalAdjuster, ChronoLocalDateTime<LocalDate>, Serializable {

    
The minimum supported LocalDateTime, '-999999999-01-01T00:00:00'. This is the local date-time of midnight at the start of the minimum date. This combines LocalDate.MIN and LocalTime.MIN. This could be used by an application as a "far past" date-time. 
/**
     * The minimum supported {@code LocalDateTime}, '-999999999-01-01T00:00:00'.
     * This is the local date-time of midnight at the start of the minimum date.
     * This combines {@link LocalDate#MIN} and {@link LocalTime#MIN}.
     * This could be used by an application as a "far past" date-time.
     */
    public static final LocalDateTime MIN = LocalDateTime.of(LocalDate.MIN, LocalTime.MIN);
    
The maximum supported LocalDateTime, '+999999999-12-31T23:59:59.999999999'. This is the local date-time just before midnight at the end of the maximum date. This combines LocalDate.MAX and LocalTime.MAX. This could be used by an application as a "far future" date-time. 
/**
     * The maximum supported {@code LocalDateTime}, '+999999999-12-31T23:59:59.999999999'.
     * This is the local date-time just before midnight at the end of the maximum date.
     * This combines {@link LocalDate#MAX} and {@link LocalTime#MAX}.
     * This could be used by an application as a "far future" date-time.
     */
    public static final LocalDateTime MAX = LocalDateTime.of(LocalDate.MAX, LocalTime.MAX);

    
Serialization version.

/**
     * Serialization version.
     */
    private static final long serialVersionUID = 6207766400415563566L;

    
The date part.

/**
     * The date part.
     */
    private final LocalDate date;
    
The time part.

/**
     * The time part.
     */
    private final LocalTime time;

    //-----------------------------------------------------------------------
    
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. 

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 and default time-zone, 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.
     * <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 and default time-zone, not null
     */
    public static LocalDateTime 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. 

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.
     * <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 LocalDateTime 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. 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.
     * 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 LocalDateTime now(Clock clock) {
        Objects.requireNonNull(clock, "clock");
        final Instant now = clock.instant();  // called once
        ZoneOffset offset = clock.getZone().getRules().getOffset(now);
        return ofEpochSecond(now.getEpochSecond(), now.getNano(), offset);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of LocalDateTime from year, month, day, hour and minute, setting the second and nanosecond to zero. 
 This returns a LocalDateTime with the specified year, month, day-of-month, hour and minute. The day must be valid for the year and month, otherwise an exception will be thrown. The second and nanosecond fields will be set to zero. 
Params:
  • year –  the year to represent, from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, not null
  • 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
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 local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from year, month,
     * day, hour and minute, setting the second and nanosecond to zero.
     * <p>
     * This returns a {@code LocalDateTime} with the specified year, month,
     * day-of-month, hour and minute.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     * The second and nanosecond fields will be set to zero.
     *
     * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, not null
     * @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
     * @return the local 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 LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute) {
        LocalDate date = LocalDate.of(year, month, dayOfMonth);
        LocalTime time = LocalTime.of(hour, minute);
        return new LocalDateTime(date, time);
    }

    
Obtains an instance of LocalDateTime from year, month, day, hour, minute and second, setting the nanosecond to zero. 
 This returns a LocalDateTime with the specified year, month, day-of-month, hour, minute and second. The day must be valid for the year and month, otherwise an exception will be thrown. The nanosecond field will be set to zero. 
Params:
  • year –  the year to represent, from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, not null
  • 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
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 local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from year, month,
     * day, hour, minute and second, setting the nanosecond to zero.
     * <p>
     * This returns a {@code LocalDateTime} with the specified year, month,
     * day-of-month, hour, minute and second.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     * The nanosecond field will be set to zero.
     *
     * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, not null
     * @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
     * @return the local 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 LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second) {
        LocalDate date = LocalDate.of(year, month, dayOfMonth);
        LocalTime time = LocalTime.of(hour, minute, second);
        return new LocalDateTime(date, time);
    }

    
Obtains an instance of LocalDateTime from year, month, day, hour, minute, second and nanosecond. 
 This returns a LocalDateTime with the specified year, month, day-of-month, hour, minute, second and nanosecond. The day must be valid for the year and month, otherwise an exception will be thrown. 
Params:
  • year –  the year to represent, from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, not null
  • 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
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 local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from year, month,
     * day, hour, minute, second and nanosecond.
     * <p>
     * This returns a {@code LocalDateTime} with the specified year, month,
     * day-of-month, hour, minute, second and nanosecond.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     *
     * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, not null
     * @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
     * @return the local 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 LocalDateTime of(int year, Month month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
        LocalDate date = LocalDate.of(year, month, dayOfMonth);
        LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
        return new LocalDateTime(date, time);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of LocalDateTime from year, month, day, hour and minute, setting the second and nanosecond to zero. 
 This returns a LocalDateTime with the specified year, month, day-of-month, hour and minute. The day must be valid for the year and month, otherwise an exception will be thrown. The second and nanosecond fields will be set to zero. 
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
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 local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from year, month,
     * day, hour and minute, setting the second and nanosecond to zero.
     * <p>
     * This returns a {@code LocalDateTime} with the specified year, month,
     * day-of-month, hour and minute.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     * The second and nanosecond fields will be set to zero.
     *
     * @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
     * @return the local 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 LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute) {
        LocalDate date = LocalDate.of(year, month, dayOfMonth);
        LocalTime time = LocalTime.of(hour, minute);
        return new LocalDateTime(date, time);
    }

    
Obtains an instance of LocalDateTime from year, month, day, hour, minute and second, setting the nanosecond to zero. 
 This returns a LocalDateTime with the specified year, month, day-of-month, hour, minute and second. The day must be valid for the year and month, otherwise an exception will be thrown. The nanosecond field will be set to zero. 
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
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 local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from year, month,
     * day, hour, minute and second, setting the nanosecond to zero.
     * <p>
     * This returns a {@code LocalDateTime} with the specified year, month,
     * day-of-month, hour, minute and second.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     * The nanosecond field will be set to zero.
     *
     * @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
     * @return the local 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 LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second) {
        LocalDate date = LocalDate.of(year, month, dayOfMonth);
        LocalTime time = LocalTime.of(hour, minute, second);
        return new LocalDateTime(date, time);
    }

    
Obtains an instance of LocalDateTime from year, month, day, hour, minute, second and nanosecond. 
 This returns a LocalDateTime with the specified year, month, day-of-month, hour, minute, second and nanosecond. The day must be valid for the year and month, otherwise an exception will be thrown. 
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
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 local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from year, month,
     * day, hour, minute, second and nanosecond.
     * <p>
     * This returns a {@code LocalDateTime} with the specified year, month,
     * day-of-month, hour, minute, second and nanosecond.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     *
     * @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
     * @return the local 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 LocalDateTime of(int year, int month, int dayOfMonth, int hour, int minute, int second, int nanoOfSecond) {
        LocalDate date = LocalDate.of(year, month, dayOfMonth);
        LocalTime time = LocalTime.of(hour, minute, second, nanoOfSecond);
        return new LocalDateTime(date, time);
    }

    
Obtains an instance of LocalDateTime from a date and time. 
Params:
  • date –  the local date, not null
  • time –  the local time, not null
Returns:the local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from a date and time.
     *
     * @param date  the local date, not null
     * @param time  the local time, not null
     * @return the local date-time, not null
     */
    public static LocalDateTime of(LocalDate date, LocalTime time) {
        Objects.requireNonNull(date, "date");
        Objects.requireNonNull(time, "time");
        return new LocalDateTime(date, time);
    }

    //-------------------------------------------------------------------------
    
Obtains an instance of LocalDateTime from an Instant and zone ID. 

This creates a local date-time based on the specified instant.
First, the offset from UTC/Greenwich is obtained using the zone ID and instant,
which is simple as there is only one valid offset for each instant.
Then, the instant and offset are used to calculate the local date-time.

Params:
  • instant –  the instant to create the date-time from, not null
  • zone –  the time-zone, which may be an offset, not null
Throws:
Returns:the local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from an {@code Instant} and zone ID.
     * <p>
     * This creates a local date-time based on the specified instant.
     * First, the offset from UTC/Greenwich is obtained using the zone ID and instant,
     * which is simple as there is only one valid offset for each instant.
     * Then, the instant and offset are used to calculate the local date-time.
     *
     * @param instant  the instant to create the date-time from, not null
     * @param zone  the time-zone, which may be an offset, not null
     * @return the local date-time, not null
     * @throws DateTimeException if the result exceeds the supported range
     */
    public static LocalDateTime ofInstant(Instant instant, ZoneId zone) {
        Objects.requireNonNull(instant, "instant");
        Objects.requireNonNull(zone, "zone");
        ZoneRules rules = zone.getRules();
        ZoneOffset offset = rules.getOffset(instant);
        return ofEpochSecond(instant.getEpochSecond(), instant.getNano(), offset);
    }

    
Obtains an instance of LocalDateTime using seconds from the epoch of 1970-01-01T00:00:00Z. 
 This allows the epoch-second field to be converted to a local date-time. This is primarily intended for low-level conversions rather than general application usage. 
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
  • offset –  the zone offset, not null
Throws:
  • DateTimeException – if the result exceeds the supported range,
 or if the nano-of-second is invalid
Returns:the local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} using seconds from the
     * epoch of 1970-01-01T00:00:00Z.
     * <p>
     * This allows the {@link ChronoField#INSTANT_SECONDS epoch-second} field
     * to be converted to a local date-time. This is primarily intended for
     * low-level conversions rather than general application usage.
     *
     * @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 offset  the zone offset, not null
     * @return the local date-time, not null
     * @throws DateTimeException if the result exceeds the supported range,
     *  or if the nano-of-second is invalid
     */
    public static LocalDateTime ofEpochSecond(long epochSecond, int nanoOfSecond, ZoneOffset offset) {
        Objects.requireNonNull(offset, "offset");
        NANO_OF_SECOND.checkValidValue(nanoOfSecond);
        long localSecond = epochSecond + offset.getTotalSeconds();  // overflow caught later
        long localEpochDay = Math.floorDiv(localSecond, SECONDS_PER_DAY);
        int secsOfDay = Math.floorMod(localSecond, SECONDS_PER_DAY);
        LocalDate date = LocalDate.ofEpochDay(localEpochDay);
        LocalTime time = LocalTime.ofNanoOfDay(secsOfDay * NANOS_PER_SECOND + nanoOfSecond);
        return new LocalDateTime(date, time);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of LocalDateTime from a temporal object. 
 This obtains a local 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 LocalDateTime. 
 The conversion extracts and combines the LocalDate and the LocalTime from the temporal object. 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, LocalDateTime::from. 
Params:
  • temporal –  the temporal object to convert, not null
Throws:
Returns:the local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} from a temporal object.
     * <p>
     * This obtains a local 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 LocalDateTime}.
     * <p>
     * The conversion extracts and combines the {@code LocalDate} and the
     * {@code LocalTime} from the temporal object.
     * 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 LocalDateTime::from}.
     *
     * @param temporal  the temporal object to convert, not null
     * @return the local date-time, not null
     * @throws DateTimeException if unable to convert to a {@code LocalDateTime}
     */
    public static LocalDateTime from(TemporalAccessor temporal) {
        if (temporal instanceof LocalDateTime) {
            return (LocalDateTime) temporal;
        } else if (temporal instanceof ZonedDateTime) {
            return ((ZonedDateTime) temporal).toLocalDateTime();
        } else if (temporal instanceof OffsetDateTime) {
            return ((OffsetDateTime) temporal).toLocalDateTime();
        }
        try {
            LocalDate date = LocalDate.from(temporal);
            LocalTime time = LocalTime.from(temporal);
            return new LocalDateTime(date, time);
        } catch (DateTimeException ex) {
            throw new DateTimeException("Unable to obtain LocalDateTime from TemporalAccessor: " +
                    temporal + " of type " + temporal.getClass().getName(), ex);
        }
    }

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

    
Obtains an instance of LocalDateTime 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 local date-time, not null
/**
     * Obtains an instance of {@code LocalDateTime} 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 local date-time, not null
     * @throws DateTimeParseException if the text cannot be parsed
     */
    public static LocalDateTime parse(CharSequence text, DateTimeFormatter formatter) {
        Objects.requireNonNull(formatter, "formatter");
        return formatter.parse(text, LocalDateTime::from);
    }

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

Params:
  • date –  the date part of the date-time, validated not null
  • time –  the time part of the date-time, validated not null
/**
     * Constructor.
     *
     * @param date  the date part of the date-time, validated not null
     * @param time  the time part of the date-time, validated not null
     */
    private LocalDateTime(LocalDate date, LocalTime time) {
        this.date = date;
        this.time = time;
    }

    
Returns a copy of this date-time with the new date and time, checking
to see if a new object is in fact required.

Params:
  • newDate –  the date of the new date-time, not null
  • newTime –  the time of the new date-time, not null
Returns:the date-time, not null
/**
     * Returns a copy of this date-time with the new date and time, checking
     * to see if a new object is in fact required.
     *
     * @param newDate  the date of the new date-time, not null
     * @param newTime  the time of the new date-time, not null
     * @return the date-time, not null
     */
    private LocalDateTime with(LocalDate newDate, LocalTime newTime) {
        if (date == newDate && time == newTime) {
            return this;
        }
        return new LocalDateTime(newDate, newTime);
    }

    //-----------------------------------------------------------------------
    
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 
 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}
     * </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) {
        if (field instanceof ChronoField) {
            ChronoField f = (ChronoField) field;
            return f.isDateBased() || f.isTimeBased();
        }
        return 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 ChronoLocalDateTime.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) {
            ChronoField f = (ChronoField) field;
            return (f.isTimeBased() ? time.range(field) : date.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 and PROLEPTIC_MONTH 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} and {@code PROLEPTIC_MONTH} 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
    public int get(TemporalField field) {
        if (field instanceof ChronoField) {
            ChronoField f = (ChronoField) field;
            return (f.isTimeBased() ? time.get(field) : date.get(field));
        }
        return ChronoLocalDateTime.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) {
            ChronoField f = (ChronoField) field;
            return (f.isTimeBased() ? time.getLong(field) : date.getLong(field));
        }
        return field.getFrom(this);
    }

    //-----------------------------------------------------------------------
    
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
    public LocalDate toLocalDate() {
        return date;
    }

    
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 date.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 date.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 date.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 date.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 date.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 date.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
    public LocalTime toLocalTime() {
        return time;
    }

    
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 time.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 time.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 time.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 time.getNano();
    }

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

 This returns a LocalDateTime, 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 = localDateTime.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 = localDateTime.with(date);
 result = localDateTime.with(time);



 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 LocalDateTime based on this with the adjustment made, not null
/**
     * Returns an adjusted copy of this date-time.
     * <p>
     * This returns a {@code LocalDateTime}, 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.
     * <p>
     * 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 = localDateTime.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 = localDateTime.with(date);
     *  result = localDateTime.with(time);
     * </pre>
     * <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 LocalDateTime} 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 LocalDateTime with(TemporalAdjuster adjuster) {
        // optimizations
        if (adjuster instanceof LocalDate) {
            return with((LocalDate) adjuster, time);
        } else if (adjuster instanceof LocalTime) {
            return with(date, (LocalTime) adjuster);
        } else if (adjuster instanceof LocalDateTime) {
            return (LocalDateTime) adjuster;
        }
        return (LocalDateTime) adjuster.adjustInto(this);
    }

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

 This returns a LocalDateTime, 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 supported fields will behave as per the matching method on LocalDate or LocalTime. 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 LocalDateTime 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 LocalDateTime}, 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.
     * The {@link #isSupported(TemporalField) supported fields} will behave as per
     * the matching method on {@link LocalDate#with(TemporalField, long) LocalDate}
     * or {@link LocalTime#with(TemporalField, long) LocalTime}.
     * 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 LocalDateTime} 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 LocalDateTime with(TemporalField field, long newValue) {
        if (field instanceof ChronoField) {
            ChronoField f = (ChronoField) field;
            if (f.isTimeBased()) {
                return with(date, time.with(field, newValue));
            } else {
                return with(date.with(field, newValue), time);
            }
        }
        return field.adjustInto(this, newValue);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this LocalDateTime with the year altered. 

The time does not affect the calculation and will be the same in the result.
If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.


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 LocalDateTime based on this date-time with the requested year, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the year altered.
     * <p>
     * The time does not affect the calculation and will be the same in the result.
     * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
     * <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 LocalDateTime} based on this date-time with the requested year, not null
     * @throws DateTimeException if the year value is invalid
     */
    public LocalDateTime withYear(int year) {
        return with(date.withYear(year), time);
    }

    
Returns a copy of this LocalDateTime with the month-of-year altered. 

The time does not affect the calculation and will be the same in the result.
If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.


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 LocalDateTime based on this date-time with the requested month, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the month-of-year altered.
     * <p>
     * The time does not affect the calculation and will be the same in the result.
     * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
     * <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 LocalDateTime} based on this date-time with the requested month, not null
     * @throws DateTimeException if the month-of-year value is invalid
     */
    public LocalDateTime withMonth(int month) {
        return with(date.withMonth(month), time);
    }

    
Returns a copy of this LocalDateTime with the day-of-month altered. 

If the resulting date-time is invalid, an exception is thrown.
The time does not affect the calculation and will be the same in the result.


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 LocalDateTime based on this date-time with the requested day, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the day-of-month altered.
     * <p>
     * If the resulting date-time is invalid, an exception is thrown.
     * The time does not affect the calculation and will be the same in the result.
     * <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 LocalDateTime} 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 LocalDateTime withDayOfMonth(int dayOfMonth) {
        return with(date.withDayOfMonth(dayOfMonth), time);
    }

    
Returns a copy of this LocalDateTime with the day-of-year altered. 

If the resulting date-time is invalid, an exception is thrown.


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 LocalDateTime based on this date with the requested day, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the day-of-year altered.
     * <p>
     * If the resulting date-time is invalid, an exception is thrown.
     * <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 LocalDateTime} 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 LocalDateTime withDayOfYear(int dayOfYear) {
        return with(date.withDayOfYear(dayOfYear), time);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this LocalDateTime with the hour-of-day altered. 

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 LocalDateTime based on this date-time with the requested hour, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the hour-of-day altered.
     * <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 LocalDateTime} based on this date-time with the requested hour, not null
     * @throws DateTimeException if the hour value is invalid
     */
    public LocalDateTime withHour(int hour) {
        LocalTime newTime = time.withHour(hour);
        return with(date, newTime);
    }

    
Returns a copy of this LocalDateTime with the minute-of-hour altered. 

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 LocalDateTime based on this date-time with the requested minute, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the minute-of-hour altered.
     * <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 LocalDateTime} based on this date-time with the requested minute, not null
     * @throws DateTimeException if the minute value is invalid
     */
    public LocalDateTime withMinute(int minute) {
        LocalTime newTime = time.withMinute(minute);
        return with(date, newTime);
    }

    
Returns a copy of this LocalDateTime with the second-of-minute altered. 

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 LocalDateTime based on this date-time with the requested second, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the second-of-minute altered.
     * <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 LocalDateTime} based on this date-time with the requested second, not null
     * @throws DateTimeException if the second value is invalid
     */
    public LocalDateTime withSecond(int second) {
        LocalTime newTime = time.withSecond(second);
        return with(date, newTime);
    }

    
Returns a copy of this LocalDateTime with the nano-of-second altered. 

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 LocalDateTime based on this date-time with the requested nanosecond, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the nano-of-second altered.
     * <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 LocalDateTime} based on this date-time with the requested nanosecond, not null
     * @throws DateTimeException if the nano value is invalid
     */
    public LocalDateTime withNano(int nanoOfSecond) {
        LocalTime newTime = time.withNano(nanoOfSecond);
        return with(date, newTime);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this LocalDateTime 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 instance is immutable and unaffected by this method call.

Params:
  • unit –  the unit to truncate to, not null
Throws:
Returns:a LocalDateTime based on this date-time with the time truncated, not null
/**
     * Returns a copy of this {@code LocalDateTime} 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 instance is immutable and unaffected by this method call.
     *
     * @param unit  the unit to truncate to, not null
     * @return a {@code LocalDateTime} 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 LocalDateTime truncatedTo(TemporalUnit unit) {
        return with(date, time.truncatedTo(unit));
    }

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

 This returns a LocalDateTime, 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 LocalDateTime 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 LocalDateTime}, 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 LocalDateTime} 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 LocalDateTime plus(TemporalAmount amountToAdd) {
        if (amountToAdd instanceof Period) {
            Period periodToAdd = (Period) amountToAdd;
            return with(date.plus(periodToAdd), time);
        }
        Objects.requireNonNull(amountToAdd, "amountToAdd");
        return (LocalDateTime) amountToAdd.addTo(this);
    }

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

 This returns a LocalDateTime, 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. Date units are added as per LocalDate.plus(long, TemporalUnit). Time units are added as per LocalTime.plus(long, TemporalUnit) with any overflow in days added equivalent to using plusDays(long). 
 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 LocalDateTime 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 LocalDateTime}, 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.
     * Date units are added as per {@link LocalDate#plus(long, TemporalUnit)}.
     * Time units are added as per {@link LocalTime#plus(long, TemporalUnit)} with
     * any overflow in days added equivalent to using {@link #plusDays(long)}.
     * <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 LocalDateTime} 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 LocalDateTime plus(long amountToAdd, TemporalUnit unit) {
        if (unit instanceof ChronoUnit) {
            ChronoUnit f = (ChronoUnit) unit;
            switch (f) {
                case NANOS: return plusNanos(amountToAdd);
                case MICROS: return plusDays(amountToAdd / MICROS_PER_DAY).plusNanos((amountToAdd % MICROS_PER_DAY) * 1000);
                case MILLIS: return plusDays(amountToAdd / MILLIS_PER_DAY).plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000_000);
                case SECONDS: return plusSeconds(amountToAdd);
                case MINUTES: return plusMinutes(amountToAdd);
                case HOURS: return plusHours(amountToAdd);
                case HALF_DAYS: return plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12);  // no overflow (256 is multiple of 2)
            }
            return with(date.plus(amountToAdd, unit), time);
        }
        return unit.addTo(this, amountToAdd);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this LocalDateTime with the specified number of years added. 

This method adds the specified amount to the years field in three steps:

    

  1. Add the input years to the year field
    2. 

  2. Check if the resulting date would be invalid
    3. 

  3. Adjust the day-of-month to the last valid day if necessary
    4. 




For example, 2008-02-29 (leap year) plus one year would result in the
invalid date 2009-02-29 (standard year). Instead of returning an invalid
result, the last valid day of the month, 2009-02-28, is selected instead.


This instance is immutable and unaffected by this method call.

Params:
  • years –  the years to add, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the years added, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of years added.
     * <p>
     * This method adds the specified amount to the years field in three steps:
     * <ol>
     * <li>Add the input years to the year field</li>
     * <li>Check if the resulting date would be invalid</li>
     * <li>Adjust the day-of-month to the last valid day if necessary</li>
     * </ol>
     * <p>
     * For example, 2008-02-29 (leap year) plus one year would result in the
     * invalid date 2009-02-29 (standard year). Instead of returning an invalid
     * result, the last valid day of the month, 2009-02-28, is selected instead.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param years  the years to add, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the years added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime plusYears(long years) {
        LocalDate newDate = date.plusYears(years);
        return with(newDate, time);
    }

    
Returns a copy of this LocalDateTime with the specified number of months added. 

This method adds the specified amount to the months field in three steps:

    

  1. Add the input months to the month-of-year field
    2. 

  2. Check if the resulting date would be invalid
    3. 

  3. Adjust the day-of-month to the last valid day if necessary
    4. 




For example, 2007-03-31 plus one month would result in the invalid date
2007-04-31. Instead of returning an invalid result, the last valid day
of the month, 2007-04-30, is selected instead.


This instance is immutable and unaffected by this method call.

Params:
  • months –  the months to add, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the months added, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of months added.
     * <p>
     * This method adds the specified amount to the months field in three steps:
     * <ol>
     * <li>Add the input months to the month-of-year field</li>
     * <li>Check if the resulting date would be invalid</li>
     * <li>Adjust the day-of-month to the last valid day if necessary</li>
     * </ol>
     * <p>
     * For example, 2007-03-31 plus one month would result in the invalid date
     * 2007-04-31. Instead of returning an invalid result, the last valid day
     * of the month, 2007-04-30, is selected instead.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param months  the months to add, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the months added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime plusMonths(long months) {
        LocalDate newDate = date.plusMonths(months);
        return with(newDate, time);
    }

    
Returns a copy of this LocalDateTime with the specified number of weeks added. 

This method adds the specified amount in weeks to the days field incrementing
the month and year fields as necessary to ensure the result remains valid.
The result is only invalid if the maximum/minimum year is exceeded.


For example, 2008-12-31 plus one week would result in 2009-01-07.


This instance is immutable and unaffected by this method call.

Params:
  • weeks –  the weeks to add, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the weeks added, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of weeks added.
     * <p>
     * This method adds the specified amount in weeks to the days field incrementing
     * the month and year fields as necessary to ensure the result remains valid.
     * The result is only invalid if the maximum/minimum year is exceeded.
     * <p>
     * For example, 2008-12-31 plus one week would result in 2009-01-07.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param weeks  the weeks to add, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the weeks added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime plusWeeks(long weeks) {
        LocalDate newDate = date.plusWeeks(weeks);
        return with(newDate, time);
    }

    
Returns a copy of this LocalDateTime with the specified number of days added. 

This method adds the specified amount to the days field incrementing the
month and year fields as necessary to ensure the result remains valid.
The result is only invalid if the maximum/minimum year is exceeded.


For example, 2008-12-31 plus one day would result in 2009-01-01.


This instance is immutable and unaffected by this method call.

Params:
  • days –  the days to add, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the days added, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of days added.
     * <p>
     * This method adds the specified amount to the days field incrementing the
     * month and year fields as necessary to ensure the result remains valid.
     * The result is only invalid if the maximum/minimum year is exceeded.
     * <p>
     * For example, 2008-12-31 plus one day would result in 2009-01-01.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param days  the days to add, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the days added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime plusDays(long days) {
        LocalDate newDate = date.plusDays(days);
        return with(newDate, time);
    }

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

This instance is immutable and unaffected by this method call.

Params:
  • hours –  the hours to add, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the hours added, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of hours added.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param hours  the hours to add, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the hours added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime plusHours(long hours) {
        return plusWithOverflow(date, hours, 0, 0, 0, 1);
    }

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

This instance is immutable and unaffected by this method call.

Params:
  • minutes –  the minutes to add, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the minutes added, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of minutes added.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param minutes  the minutes to add, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the minutes added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime plusMinutes(long minutes) {
        return plusWithOverflow(date, 0, minutes, 0, 0, 1);
    }

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

This instance is immutable and unaffected by this method call.

Params:
  • seconds –  the seconds to add, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the seconds added, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of seconds added.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param seconds  the seconds to add, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the seconds added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime plusSeconds(long seconds) {
        return plusWithOverflow(date, 0, 0, seconds, 0, 1);
    }

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

This instance is immutable and unaffected by this method call.

Params:
  • nanos –  the nanos to add, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the nanoseconds added, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds added.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param nanos  the nanos to add, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the nanoseconds added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime plusNanos(long nanos) {
        return plusWithOverflow(date, 0, 0, 0, nanos, 1);
    }

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

 This returns a LocalDateTime, 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 LocalDateTime 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 LocalDateTime}, 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 LocalDateTime} 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 LocalDateTime minus(TemporalAmount amountToSubtract) {
        if (amountToSubtract instanceof Period) {
            Period periodToSubtract = (Period) amountToSubtract;
            return with(date.minus(periodToSubtract), time);
        }
        Objects.requireNonNull(amountToSubtract, "amountToSubtract");
        return (LocalDateTime) amountToSubtract.subtractFrom(this);
    }

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

 This returns a LocalDateTime, 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. 
 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 LocalDateTime 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 LocalDateTime}, 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>
     * 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 LocalDateTime} 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 LocalDateTime 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 LocalDateTime with the specified number of years subtracted. 

This method subtracts the specified amount from the years field in three steps:

    

  1. Subtract the input years from the year field
    2. 

  2. Check if the resulting date would be invalid
    3. 

  3. Adjust the day-of-month to the last valid day if necessary
    4. 




For example, 2008-02-29 (leap year) minus one year would result in the
invalid date 2007-02-29 (standard year). Instead of returning an invalid
result, the last valid day of the month, 2007-02-28, is selected instead.


This instance is immutable and unaffected by this method call.

Params:
  • years –  the years to subtract, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the years subtracted, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of years subtracted.
     * <p>
     * This method subtracts the specified amount from the years field in three steps:
     * <ol>
     * <li>Subtract the input years from the year field</li>
     * <li>Check if the resulting date would be invalid</li>
     * <li>Adjust the day-of-month to the last valid day if necessary</li>
     * </ol>
     * <p>
     * For example, 2008-02-29 (leap year) minus one year would result in the
     * invalid date 2007-02-29 (standard year). Instead of returning an invalid
     * result, the last valid day of the month, 2007-02-28, is selected instead.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param years  the years to subtract, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the years subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime minusYears(long years) {
        return (years == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-years));
    }

    
Returns a copy of this LocalDateTime with the specified number of months subtracted. 

This method subtracts the specified amount from the months field in three steps:

    

  1. Subtract the input months from the month-of-year field
    2. 

  2. Check if the resulting date would be invalid
    3. 

  3. Adjust the day-of-month to the last valid day if necessary
    4. 




For example, 2007-03-31 minus one month would result in the invalid date
2007-02-31. Instead of returning an invalid result, the last valid day
of the month, 2007-02-28, is selected instead.


This instance is immutable and unaffected by this method call.

Params:
  • months –  the months to subtract, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the months subtracted, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of months subtracted.
     * <p>
     * This method subtracts the specified amount from the months field in three steps:
     * <ol>
     * <li>Subtract the input months from the month-of-year field</li>
     * <li>Check if the resulting date would be invalid</li>
     * <li>Adjust the day-of-month to the last valid day if necessary</li>
     * </ol>
     * <p>
     * For example, 2007-03-31 minus one month would result in the invalid date
     * 2007-02-31. Instead of returning an invalid result, the last valid day
     * of the month, 2007-02-28, is selected instead.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param months  the months to subtract, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the months subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime minusMonths(long months) {
        return (months == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-months));
    }

    
Returns a copy of this LocalDateTime with the specified number of weeks subtracted. 

This method subtracts the specified amount in weeks from the days field decrementing
the month and year fields as necessary to ensure the result remains valid.
The result is only invalid if the maximum/minimum year is exceeded.


For example, 2009-01-07 minus one week would result in 2008-12-31.


This instance is immutable and unaffected by this method call.

Params:
  • weeks –  the weeks to subtract, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the weeks subtracted, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of weeks subtracted.
     * <p>
     * This method subtracts the specified amount in weeks from the days field decrementing
     * the month and year fields as necessary to ensure the result remains valid.
     * The result is only invalid if the maximum/minimum year is exceeded.
     * <p>
     * For example, 2009-01-07 minus one week would result in 2008-12-31.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param weeks  the weeks to subtract, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the weeks subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime minusWeeks(long weeks) {
        return (weeks == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeks));
    }

    
Returns a copy of this LocalDateTime with the specified number of days subtracted. 

This method subtracts the specified amount from the days field decrementing the
month and year fields as necessary to ensure the result remains valid.
The result is only invalid if the maximum/minimum year is exceeded.


For example, 2009-01-01 minus one day would result in 2008-12-31.


This instance is immutable and unaffected by this method call.

Params:
  • days –  the days to subtract, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the days subtracted, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of days subtracted.
     * <p>
     * This method subtracts the specified amount from the days field decrementing the
     * month and year fields as necessary to ensure the result remains valid.
     * The result is only invalid if the maximum/minimum year is exceeded.
     * <p>
     * For example, 2009-01-01 minus one day would result in 2008-12-31.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param days  the days to subtract, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the days subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime minusDays(long days) {
        return (days == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-days));
    }

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

This instance is immutable and unaffected by this method call.

Params:
  • hours –  the hours to subtract, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the hours subtracted, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of hours subtracted.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param hours  the hours to subtract, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the hours subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime minusHours(long hours) {
        return plusWithOverflow(date, hours, 0, 0, 0, -1);
   }

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

This instance is immutable and unaffected by this method call.

Params:
  • minutes –  the minutes to subtract, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the minutes subtracted, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of minutes subtracted.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param minutes  the minutes to subtract, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the minutes subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime minusMinutes(long minutes) {
        return plusWithOverflow(date, 0, minutes, 0, 0, -1);
    }

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

This instance is immutable and unaffected by this method call.

Params:
  • seconds –  the seconds to subtract, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the seconds subtracted, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of seconds subtracted.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param seconds  the seconds to subtract, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the seconds subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime minusSeconds(long seconds) {
        return plusWithOverflow(date, 0, 0, seconds, 0, -1);
    }

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

This instance is immutable and unaffected by this method call.

Params:
  • nanos –  the nanos to subtract, may be negative
Throws:
Returns:a LocalDateTime based on this date-time with the nanoseconds subtracted, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified number of nanoseconds subtracted.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param nanos  the nanos to subtract, may be negative
     * @return a {@code LocalDateTime} based on this date-time with the nanoseconds subtracted, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDateTime minusNanos(long nanos) {
        return plusWithOverflow(date, 0, 0, 0, nanos, -1);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this LocalDateTime with the specified period added. 

This instance is immutable and unaffected by this method call.

Params:
  • newDate –  the new date to base the calculation on, not null
  • hours –  the hours to add, may be negative
  • minutes – the minutes to add, may be negative
  • seconds – the seconds to add, may be negative
  • nanos – the nanos to add, may be negative
  • sign –  the sign to determine add or subtract
Returns:the combined result, not null
/**
     * Returns a copy of this {@code LocalDateTime} with the specified period added.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param newDate  the new date to base the calculation on, not null
     * @param hours  the hours to add, may be negative
     * @param minutes the minutes to add, may be negative
     * @param seconds the seconds to add, may be negative
     * @param nanos the nanos to add, may be negative
     * @param sign  the sign to determine add or subtract
     * @return the combined result, not null
     */
    private LocalDateTime plusWithOverflow(LocalDate newDate, long hours, long minutes, long seconds, long nanos, int sign) {
        // 9223372036854775808 long, 2147483648 int
        if ((hours | minutes | seconds | nanos) == 0) {
            return with(newDate, time);
        }
        long totDays = nanos / NANOS_PER_DAY +             //   max/24*60*60*1B
                seconds / SECONDS_PER_DAY +                //   max/24*60*60
                minutes / MINUTES_PER_DAY +                //   max/24*60
                hours / HOURS_PER_DAY;                     //   max/24
        totDays *= sign;                                   // total max*0.4237...
        long totNanos = nanos % NANOS_PER_DAY +                    //   max  86400000000000
                (seconds % SECONDS_PER_DAY) * NANOS_PER_SECOND +   //   max  86400000000000
                (minutes % MINUTES_PER_DAY) * NANOS_PER_MINUTE +   //   max  86400000000000
                (hours % HOURS_PER_DAY) * NANOS_PER_HOUR;          //   max  86400000000000
        long curNoD = time.toNanoOfDay();                       //   max  86400000000000
        totNanos = totNanos * sign + curNoD;                    // total 432000000000000
        totDays += Math.floorDiv(totNanos, NANOS_PER_DAY);
        long newNoD = Math.floorMod(totNanos, NANOS_PER_DAY);
        LocalTime newTime = (newNoD == curNoD ? time : LocalTime.ofNanoOfDay(newNoD));
        return with(newDate.plusDays(totDays), newTime);
    }

    //-----------------------------------------------------------------------
    
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) date;
        }
        return ChronoLocalDateTime.super.query(query);
    }

    
Adjusts the specified temporal object to have the same date and time as this object.


This returns a temporal object of the same observable type as the input
with the date and time changed to be the same as this.

 The adjustment is equivalent to using Temporal.with(TemporalField, long) twice, passing ChronoField.EPOCH_DAY and ChronoField.NANO_OF_DAY as the fields. 
 In most cases, it is clearer to reverse the calling pattern by using Temporal.with(TemporalAdjuster): 
  // these two lines are equivalent, but the second approach is recommended
  temporal = thisLocalDateTime.adjustInto(temporal);
  temporal = temporal.with(thisLocalDateTime);




This instance is immutable and unaffected by this method call.

Params:
  • temporal –  the target object to be adjusted, not null
Throws:
Returns:the adjusted object, not null
/**
     * Adjusts the specified temporal object to have the same date and time as this object.
     * <p>
     * This returns a temporal object of the same observable type as the input
     * with the date and time changed to be the same as this.
     * <p>
     * The adjustment is equivalent to using {@link Temporal#with(TemporalField, long)}
     * twice, passing {@link ChronoField#EPOCH_DAY} and
     * {@link ChronoField#NANO_OF_DAY} as the fields.
     * <p>
     * In most cases, it is clearer to reverse the calling pattern by using
     * {@link Temporal#with(TemporalAdjuster)}:
     * <pre>
     *   // these two lines are equivalent, but the second approach is recommended
     *   temporal = thisLocalDateTime.adjustInto(temporal);
     *   temporal = temporal.with(thisLocalDateTime);
     * </pre>
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param temporal  the target object to be adjusted, not null
     * @return the adjusted object, not null
     * @throws DateTimeException if unable to make the adjustment
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override  // override for Javadoc
    public Temporal adjustInto(Temporal temporal) {
        return ChronoLocalDateTime.super.adjustInto(temporal);
    }

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

 This calculates the amount of time between two LocalDateTime 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. The Temporal passed to this method is converted to a LocalDateTime using from(TemporalAccessor). For example, the amount in days between two date-times can be calculated using startDateTime.until(endDateTime, DAYS). 

The calculation returns a whole number, representing the number of
complete units between the two date-times.
For example, the amount in months between 2012-06-15T00:00 and 2012-08-14T23:59
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. 
 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 LocalDateTime, 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 LocalDateTime}
     * 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.
     * The {@code Temporal} passed to this method is converted to a
     * {@code LocalDateTime} using {@link #from(TemporalAccessor)}.
     * For example, the amount in days between two date-times can be calculated
     * using {@code startDateTime.until(endDateTime, DAYS)}.
     * <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 2012-06-15T00:00 and 2012-08-14T23:59
     * 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>
     * 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 LocalDateTime}, 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 LocalDateTime}
     * @throws UnsupportedTemporalTypeException if the unit is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public long until(Temporal endExclusive, TemporalUnit unit) {
        LocalDateTime end = LocalDateTime.from(endExclusive);
        if (unit instanceof ChronoUnit) {
            if (unit.isTimeBased()) {
                long amount = date.daysUntil(end.date);
                if (amount == 0) {
                    return time.until(end.time, unit);
                }
                long timePart = end.time.toNanoOfDay() - time.toNanoOfDay();
                if (amount > 0) {
                    amount--;  // safe
                    timePart += NANOS_PER_DAY;  // safe
                } else {
                    amount++;  // safe
                    timePart -= NANOS_PER_DAY;  // safe
                }
                switch ((ChronoUnit) unit) {
                    case NANOS:
                        amount = Math.multiplyExact(amount, NANOS_PER_DAY);
                        break;
                    case MICROS:
                        amount = Math.multiplyExact(amount, MICROS_PER_DAY);
                        timePart = timePart / 1000;
                        break;
                    case MILLIS:
                        amount = Math.multiplyExact(amount, MILLIS_PER_DAY);
                        timePart = timePart / 1_000_000;
                        break;
                    case SECONDS:
                        amount = Math.multiplyExact(amount, SECONDS_PER_DAY);
                        timePart = timePart / NANOS_PER_SECOND;
                        break;
                    case MINUTES:
                        amount = Math.multiplyExact(amount, MINUTES_PER_DAY);
                        timePart = timePart / NANOS_PER_MINUTE;
                        break;
                    case HOURS:
                        amount = Math.multiplyExact(amount, HOURS_PER_DAY);
                        timePart = timePart / NANOS_PER_HOUR;
                        break;
                    case HALF_DAYS:
                        amount = Math.multiplyExact(amount, 2);
                        timePart = timePart / (NANOS_PER_HOUR * 12);
                        break;
                }
                return Math.addExact(amount, timePart);
            }
            LocalDate endDate = end.date;
            if (endDate.isAfter(date) && end.time.isBefore(time)) {
                endDate = endDate.minusDays(1);
            } else if (endDate.isBefore(date) && end.time.isAfter(time)) {
                endDate = endDate.plusDays(1);
            }
            return date.until(endDate, 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);
    }

    //-----------------------------------------------------------------------
    
Combines this date-time with an offset to create an OffsetDateTime. 
 This returns an OffsetDateTime formed from this date-time at the specified offset. All possible combinations of date-time and offset are valid. 
Params:
  • offset –  the offset to combine with, not null
Returns:the offset date-time formed from this date-time and the specified offset, not null
/**
     * Combines this date-time with an offset to create an {@code OffsetDateTime}.
     * <p>
     * This returns an {@code OffsetDateTime} formed from this date-time at the specified offset.
     * All possible combinations of date-time and offset are valid.
     *
     * @param offset  the offset to combine with, not null
     * @return the offset date-time formed from this date-time and the specified offset, not null
     */
    public OffsetDateTime atOffset(ZoneOffset offset) {
        return OffsetDateTime.of(this, offset);
    }

    
Combines this date-time with a time-zone to create a ZonedDateTime. 
 This returns a ZonedDateTime formed from this date-time at the specified time-zone. The result will match this 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, where 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, 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".

 To obtain the later offset during an overlap, call ZonedDateTime.withLaterOffsetAtOverlap() on the result of this method. To throw an exception when there is a gap or overlap, use ZonedDateTime.ofStrict(LocalDateTime, ZoneOffset, ZoneId). 
Params:
  • zone –  the time-zone to use, not null
Returns:the zoned date-time formed from this date-time, not null
/**
     * Combines this date-time with a time-zone to create a {@code ZonedDateTime}.
     * <p>
     * This returns a {@code ZonedDateTime} formed from this date-time at the
     * specified time-zone. The result will match this 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, where 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, 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".
     * <p>
     * To obtain the later offset during an overlap, call
     * {@link ZonedDateTime#withLaterOffsetAtOverlap()} on the result of this method.
     * To throw an exception when there is a gap or overlap, use
     * {@link ZonedDateTime#ofStrict(LocalDateTime, ZoneOffset, ZoneId)}.
     *
     * @param zone  the time-zone to use, not null
     * @return the zoned date-time formed from this date-time, not null
     */
    @Override
    public ZonedDateTime atZone(ZoneId zone) {
        return ZonedDateTime.of(this, zone);
    }

    //-----------------------------------------------------------------------
    
Compares this date-time to another date-time.

 The comparison is primarily based on the date-time, from earliest to latest. It is "consistent with equals", as defined by Comparable. 
 If all the date-times being compared are instances of LocalDateTime, then the comparison will be entirely based on the date-time. If some dates being compared are in different chronologies, then the chronology is also considered, see ChronoLocalDateTime.compareTo. 
Params:
  • other –  the other date-time to compare to, not null
Returns:the comparator value, negative if less, positive if greater
/**
     * Compares this date-time to another date-time.
     * <p>
     * The comparison is primarily based on the date-time, from earliest to latest.
     * It is "consistent with equals", as defined by {@link Comparable}.
     * <p>
     * If all the date-times being compared are instances of {@code LocalDateTime},
     * then the comparison will be entirely based on the date-time.
     * If some dates being compared are in different chronologies, then the
     * chronology is also considered, see {@link ChronoLocalDateTime#compareTo}.
     *
     * @param other  the other date-time to compare to, not null
     * @return the comparator value, negative if less, positive if greater
     */
    @Override  // override for Javadoc and performance
    public int compareTo(ChronoLocalDateTime<?> other) {
        if (other instanceof LocalDateTime) {
            return compareTo0((LocalDateTime) other);
        }
        return ChronoLocalDateTime.super.compareTo(other);
    }

    private int compareTo0(LocalDateTime other) {
        int cmp = date.compareTo0(other.toLocalDate());
        if (cmp == 0) {
            cmp = time.compareTo(other.toLocalTime());
        }
        return cmp;
    }

    
Checks if this date-time is after the specified date-time.


This checks to see if this date-time represents a point on the
local time-line after the other date-time.

  LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
  LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
  a.isAfter(b) == false
  a.isAfter(a) == false
  b.isAfter(a) == true



 This method only considers the position of the two date-times on the local time-line. It does not take into account the chronology, or calendar system. This is different from the comparison in compareTo(ChronoLocalDateTime<?>), but is the same approach as ChronoLocalDateTime.timeLineOrder(). 
Params:
  • other –  the other date-time to compare to, not null
Returns:true if this date-time is after the specified date-time
/**
     * Checks if this date-time is after the specified date-time.
     * <p>
     * This checks to see if this date-time represents a point on the
     * local time-line after the other date-time.
     * <pre>
     *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
     *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
     *   a.isAfter(b) == false
     *   a.isAfter(a) == false
     *   b.isAfter(a) == true
     * </pre>
     * <p>
     * This method only considers the position of the two date-times on the local time-line.
     * It does not take into account the chronology, or calendar system.
     * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
     * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
     *
     * @param other  the other date-time to compare to, not null
     * @return true if this date-time is after the specified date-time
     */
    @Override  // override for Javadoc and performance
    public boolean isAfter(ChronoLocalDateTime<?> other) {
        if (other instanceof LocalDateTime) {
            return compareTo0((LocalDateTime) other) > 0;
        }
        return ChronoLocalDateTime.super.isAfter(other);
    }

    
Checks if this date-time is before the specified date-time.


This checks to see if this date-time represents a point on the
local time-line before the other date-time.

  LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
  LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
  a.isBefore(b) == true
  a.isBefore(a) == false
  b.isBefore(a) == false



 This method only considers the position of the two date-times on the local time-line. It does not take into account the chronology, or calendar system. This is different from the comparison in compareTo(ChronoLocalDateTime<?>), but is the same approach as ChronoLocalDateTime.timeLineOrder(). 
Params:
  • other –  the other date-time to compare to, not null
Returns:true if this date-time is before the specified date-time
/**
     * Checks if this date-time is before the specified date-time.
     * <p>
     * This checks to see if this date-time represents a point on the
     * local time-line before the other date-time.
     * <pre>
     *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
     *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
     *   a.isBefore(b) == true
     *   a.isBefore(a) == false
     *   b.isBefore(a) == false
     * </pre>
     * <p>
     * This method only considers the position of the two date-times on the local time-line.
     * It does not take into account the chronology, or calendar system.
     * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
     * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
     *
     * @param other  the other date-time to compare to, not null
     * @return true if this date-time is before the specified date-time
     */
    @Override  // override for Javadoc and performance
    public boolean isBefore(ChronoLocalDateTime<?> other) {
        if (other instanceof LocalDateTime) {
            return compareTo0((LocalDateTime) other) < 0;
        }
        return ChronoLocalDateTime.super.isBefore(other);
    }

    
Checks if this date-time is equal to the specified date-time.


This checks to see if this date-time represents the same point on the
local time-line as the other date-time.

  LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
  LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
  a.isEqual(b) == false
  a.isEqual(a) == true
  b.isEqual(a) == false



 This method only considers the position of the two date-times on the local time-line. It does not take into account the chronology, or calendar system. This is different from the comparison in compareTo(ChronoLocalDateTime<?>), but is the same approach as ChronoLocalDateTime.timeLineOrder(). 
Params:
  • other –  the other date-time to compare to, not null
Returns:true if this date-time is equal to the specified date-time
/**
     * Checks if this date-time is equal to the specified date-time.
     * <p>
     * This checks to see if this date-time represents the same point on the
     * local time-line as the other date-time.
     * <pre>
     *   LocalDate a = LocalDateTime.of(2012, 6, 30, 12, 00);
     *   LocalDate b = LocalDateTime.of(2012, 7, 1, 12, 00);
     *   a.isEqual(b) == false
     *   a.isEqual(a) == true
     *   b.isEqual(a) == false
     * </pre>
     * <p>
     * This method only considers the position of the two date-times on the local time-line.
     * It does not take into account the chronology, or calendar system.
     * This is different from the comparison in {@link #compareTo(ChronoLocalDateTime)},
     * but is the same approach as {@link ChronoLocalDateTime#timeLineOrder()}.
     *
     * @param other  the other date-time to compare to, not null
     * @return true if this date-time is equal to the specified date-time
     */
    @Override  // override for Javadoc and performance
    public boolean isEqual(ChronoLocalDateTime<?> other) {
        if (other instanceof LocalDateTime) {
            return compareTo0((LocalDateTime) other) == 0;
        }
        return ChronoLocalDateTime.super.isEqual(other);
    }

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

 Compares this LocalDateTime with another ensuring that the date-time is the same. Only objects of type LocalDateTime 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>
     * Compares this {@code LocalDateTime} with another ensuring that the date-time is the same.
     * Only objects of type {@code LocalDateTime} 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 LocalDateTime) {
            LocalDateTime other = (LocalDateTime) obj;
            return date.equals(other.date) && time.equals(other.time);
        }
        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 date.hashCode() ^ time.hashCode();
    }

    //-----------------------------------------------------------------------
    
Outputs this date-time as a String, such as 2007-12-03T10:15:30. 

The output will be one of the following ISO-8601 formats:

    

  • uuuu-MM-dd'T'HH:mm
    • 

  • uuuu-MM-dd'T'HH:mm:ss
    • 

  • uuuu-MM-dd'T'HH:mm:ss.SSS
    • 

  • uuuu-MM-dd'T'HH:mm:ss.SSSSSS
    • 

  • uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS
    • 


The format used will be the shortest that outputs the full value of
the time where the omitted parts are implied to be zero.

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}.
     * <p>
     * The output will be one of the following ISO-8601 formats:
     * <ul>
     * <li>{@code uuuu-MM-dd'T'HH:mm}</li>
     * <li>{@code uuuu-MM-dd'T'HH:mm:ss}</li>
     * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSS}</li>
     * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSS}</li>
     * <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS}</li>
     * </ul>
     * The format used will be the shortest that outputs the full value of
     * the time where the omitted parts are implied to be zero.
     *
     * @return a string representation of this date-time, not null
     */
    @Override
    public String toString() {
        return date.toString() + 'T' + time.toString();
    }

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

@serialData

 out.writeByte(5);  // identifies a LocalDateTime
 // the date excluding the one byte header
 // the time 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(5);  // identifies a LocalDateTime
     *  // the <a href="../../serialized-form.html#java.time.LocalDate">date</a> excluding the one byte header
     *  // the <a href="../../serialized-form.html#java.time.LocalTime">time</a> excluding the one byte header
     * </pre>
     *
     * @return the instance of {@code Ser}, not null
     */
    private Object writeReplace() {
        return new Ser(Ser.LOCAL_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 {
        date.writeExternal(out);
        time.writeExternal(out);
    }

    static LocalDateTime readExternal(DataInput in) throws IOException {
        LocalDate date = LocalDate.readExternal(in);
        LocalTime time = LocalTime.readExternal(in);
        return LocalDateTime.of(date, time);
    }

}