/*
 *  Copyright 2001-2013 Stephen Colebourne
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.joda.time;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;

import org.joda.convert.FromString;
import org.joda.convert.ToString;
import org.joda.time.base.BaseLocal;
import org.joda.time.chrono.ISOChronology;
import org.joda.time.convert.ConverterManager;
import org.joda.time.convert.PartialConverter;
import org.joda.time.field.AbstractReadableInstantFieldProperty;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;

LocalDateTime is an unmodifiable datetime class representing a
datetime without a time zone.
 LocalDateTime implements the ReadablePartial interface. To do this, certain methods focus on key fields Year, MonthOfYear, DayOfYear and MillisOfDay. However, all fields may in fact be queried.

Internally, LocalDateTime uses a single millisecond-based value to
represent the local datetime. This value is only used internally and
is not exposed to applications.
 Calculations on LocalDateTime are performed using a Chronology. This chronology will be set internally to be in the UTC time zone for all calculations. 
Each individual field can be queried in two ways:

getHourOfDay()
hourOfDay().get()

The second technique also provides access to other useful methods on the
field:

numeric value
text value
short text value
maximum/minimum values
add/subtract
set
rounding


LocalDateTime is thread-safe and immutable, provided that the Chronology is as well.
All standard Chronology classes supplied are thread-safe and immutable.
Author:
Stephen Colebourne
Since:
1.3/**
 * LocalDateTime is an unmodifiable datetime class representing a
 * datetime without a time zone.
 * <p>
 * LocalDateTime implements the {@link ReadablePartial} interface.
 * To do this, certain methods focus on key fields Year, MonthOfYear,
 * DayOfYear and MillisOfDay.
 * However, <b>all</b> fields may in fact be queried.
 * <p>
 * Internally, LocalDateTime uses a single millisecond-based value to
 * represent the local datetime. This value is only used internally and
 * is not exposed to applications.
 * <p>
 * Calculations on LocalDateTime are performed using a {@link Chronology}.
 * This chronology will be set internally to be in the UTC time zone
 * for all calculations.
 *
 * <p>Each individual field can be queried in two ways:
 * <ul>
 * <li><code>getHourOfDay()</code>
 * <li><code>hourOfDay().get()</code>
 * </ul>
 * The second technique also provides access to other useful methods on the
 * field:
 * <ul>
 * <li>numeric value
 * <li>text value
 * <li>short text value
 * <li>maximum/minimum values
 * <li>add/subtract
 * <li>set
 * <li>rounding
 * </ul>
 *
 * <p>
 * LocalDateTime is thread-safe and immutable, provided that the Chronology is as well.
 * All standard Chronology classes supplied are thread-safe and immutable.
 *
 * @author Stephen Colebourne
 * @since 1.3
 */
public final class LocalDateTime
        extends BaseLocal
        implements ReadablePartial, Serializable {

    
Serialization lock /** Serialization lock */
    private static final long serialVersionUID = -268716875315837168L;

    
The index of the year field in the field array /** The index of the year field in the field array */
    private static final int YEAR = 0;
    
The index of the monthOfYear field in the field array /** The index of the monthOfYear field in the field array */
    private static final int MONTH_OF_YEAR = 1;
    
The index of the dayOfMonth field in the field array /** The index of the dayOfMonth field in the field array */
    private static final int DAY_OF_MONTH = 2;
    
The index of the millis field in the field array /** The index of the millis field in the field array */
    private static final int MILLIS_OF_DAY = 3;

    
The local millis from 1970-01-01T00:00:00 /** The local millis from 1970-01-01T00:00:00 */
    private final long iLocalMillis;
    
The chronology to use in UTC /** The chronology to use in UTC */
    private final Chronology iChronology;

    //-----------------------------------------------------------------------
    
Obtains a LocalDateTime set to the current system millisecond time using ISOChronology in the default time zone.
The resulting object does not use the zone.
Returns:
the current date, not null
Since:
2.0/**
     * Obtains a {@code LocalDateTime} set to the current system millisecond time
     * using <code>ISOChronology</code> in the default time zone.
     * The resulting object does not use the zone.
     * 
     * @return the current date, not null
     * @since 2.0
     */
    public static LocalDateTime now() {
        return new LocalDateTime();
    }

    
Obtains a LocalDateTime set to the current system millisecond time using ISOChronology in the specified time zone.
The resulting object does not use the zone.
Params:
zone –  the time zone, not null
Returns:
the current date, not null
Since:
2.0/**
     * Obtains a {@code LocalDateTime} set to the current system millisecond time
     * using <code>ISOChronology</code> in the specified time zone.
     * The resulting object does not use the zone.
     *
     * @param zone  the time zone, not null
     * @return the current date, not null
     * @since 2.0
     */
    public static LocalDateTime now(DateTimeZone zone) {
        if (zone == null) {
            throw new NullPointerException("Zone must not be null");
        }
        return new LocalDateTime(zone);
    }

    
Obtains a LocalDateTime set to the current system millisecond time using the specified chronology. The resulting object does not use the zone. 
Params:
chronology –  the chronology, not null
Returns:
the current date, not null
Since:
2.0/**
     * Obtains a {@code LocalDateTime} set to the current system millisecond time
     * using the specified chronology.
     * The resulting object does not use the zone.
     *
     * @param chronology  the chronology, not null
     * @return the current date, not null
     * @since 2.0
     */
    public static LocalDateTime now(Chronology chronology) {
        if (chronology == null) {
            throw new NullPointerException("Chronology must not be null");
        }
        return new LocalDateTime(chronology);
    }

    //-----------------------------------------------------------------------
    
Parses a LocalDateTime from the specified string. 
 This uses ISODateTimeFormat.localDateOptionalTimeParser(). 
Params:
str –  the string to parse, not null
Since:
2.0/**
     * Parses a {@code LocalDateTime} from the specified string.
     * <p>
     * This uses {@link ISODateTimeFormat#localDateOptionalTimeParser()}.
     * 
     * @param str  the string to parse, not null
     * @since 2.0
     */
    @FromString
    public static LocalDateTime parse(String str) {
        return parse(str, ISODateTimeFormat.localDateOptionalTimeParser());
    }

    
Parses a LocalDateTime from the specified string using a formatter. 
Params:
str –  the string to parse, not null
formatter –  the formatter to use, not null
Since:
2.0/**
     * Parses a {@code LocalDateTime} from the specified string using a formatter.
     * 
     * @param str  the string to parse, not null
     * @param formatter  the formatter to use, not null
     * @since 2.0
     */
    public static LocalDateTime parse(String str, DateTimeFormatter formatter) {
        return formatter.parseLocalDateTime(str);
    }

    //-----------------------------------------------------------------------
    
Constructs a LocalDateTime from a java.util.Calendar
using exactly the same field values.

Each field is queried from the Calendar and assigned to the LocalDateTime.
This is useful if you have been using the Calendar as a local date,
ignoring the zone.

One advantage of this method is that this method is unaffected if the
version of the time zone data differs between the JDK and Joda-Time.
That is because the local field values are transferred, calculated using
the JDK time zone data and without using the Joda-Time time zone data.

This factory method ignores the type of the calendar and always
creates a LocalDateTime with ISO chronology. It is expected that you
will only pass in instances of GregorianCalendar however
this is not validated.
Params:
calendar –  the Calendar to extract fields from, not null
Throws:
IllegalArgumentException – if the calendar is null
IllegalArgumentException – if the date is invalid for the ISO chronology
Returns:
the created local date-time, not null/**
     * Constructs a LocalDateTime from a <code>java.util.Calendar</code>
     * using exactly the same field values.
     * <p>
     * Each field is queried from the Calendar and assigned to the LocalDateTime.
     * This is useful if you have been using the Calendar as a local date,
     * ignoring the zone.
     * <p>
     * One advantage of this method is that this method is unaffected if the
     * version of the time zone data differs between the JDK and Joda-Time.
     * That is because the local field values are transferred, calculated using
     * the JDK time zone data and without using the Joda-Time time zone data.
     * <p>
     * This factory method ignores the type of the calendar and always
     * creates a LocalDateTime with ISO chronology. It is expected that you
     * will only pass in instances of <code>GregorianCalendar</code> however
     * this is not validated.
     *
     * @param calendar  the Calendar to extract fields from, not null
     * @return the created local date-time, not null
     * @throws IllegalArgumentException if the calendar is null
     * @throws IllegalArgumentException if the date is invalid for the ISO chronology
     */
    public static LocalDateTime fromCalendarFields(Calendar calendar) {
        if (calendar == null) {
            throw new IllegalArgumentException("The calendar must not be null");
        }
        int era = calendar.get(Calendar.ERA);
        int yearOfEra = calendar.get(Calendar.YEAR);
        return new LocalDateTime(
            (era == GregorianCalendar.AD ? yearOfEra : 1 - yearOfEra),
            calendar.get(Calendar.MONTH) + 1,
            calendar.get(Calendar.DAY_OF_MONTH),
            calendar.get(Calendar.HOUR_OF_DAY),
            calendar.get(Calendar.MINUTE),
            calendar.get(Calendar.SECOND),
            calendar.get(Calendar.MILLISECOND)
        );
    }

    
Constructs a LocalDateTime from a java.util.Date
using exactly the same field values.

Each field is queried from the Date and assigned to the LocalDateTime.
This is useful if you have been using the Date as a local date,
ignoring the zone.

One advantage of this method is that this method is unaffected if the
version of the time zone data differs between the JDK and Joda-Time.
That is because the local field values are transferred, calculated using
the JDK time zone data and without using the Joda-Time time zone data.

This factory method always creates a LocalDateTime with ISO chronology.
Params:
date –  the Date to extract fields from, not null
Throws:
IllegalArgumentException – if the calendar is null
IllegalArgumentException – if the date is invalid for the ISO chronology
Returns:
the created local date-time, not null/**
     * Constructs a LocalDateTime from a <code>java.util.Date</code>
     * using exactly the same field values.
     * <p>
     * Each field is queried from the Date and assigned to the LocalDateTime.
     * This is useful if you have been using the Date as a local date,
     * ignoring the zone.
     * <p>
     * One advantage of this method is that this method is unaffected if the
     * version of the time zone data differs between the JDK and Joda-Time.
     * That is because the local field values are transferred, calculated using
     * the JDK time zone data and without using the Joda-Time time zone data.
     * <p>
     * This factory method always creates a LocalDateTime with ISO chronology.
     *
     * @param date  the Date to extract fields from, not null
     * @return the created local date-time, not null
     * @throws IllegalArgumentException if the calendar is null
     * @throws IllegalArgumentException if the date is invalid for the ISO chronology
     */
    @SuppressWarnings("deprecation")
    public static LocalDateTime fromDateFields(Date date) {
        if (date == null) {
            throw new IllegalArgumentException("The date must not be null");
        }
        if (date.getTime() < 0) {
            // handle years in era BC
            GregorianCalendar cal = new GregorianCalendar();
            cal.setTime(date);
            return fromCalendarFields(cal);
        }
        return new LocalDateTime(
            date.getYear() + 1900,
            date.getMonth() + 1,
            date.getDate(),
            date.getHours(),
            date.getMinutes(),
            date.getSeconds(),
            (((int) (date.getTime() % 1000)) + 1000) % 1000
        );
    }

    //-----------------------------------------------------------------------
    
Constructs an instance set to the current local time evaluated using
ISO chronology in the default zone.

Once the constructor is completed, the zone is no longer used.
See Also:
now()/**
     * Constructs an instance set to the current local time evaluated using
     * ISO chronology in the default zone.
     * <p>
     * Once the constructor is completed, the zone is no longer used.
     * 
     * @see #now()
     */
    public LocalDateTime() {
        this(DateTimeUtils.currentTimeMillis(), ISOChronology.getInstance());
    }

    
Constructs an instance set to the current local time evaluated using
ISO chronology in the specified zone.

If the specified time zone is null, the default zone is used.
Once the constructor is completed, the zone is no longer used.
Params:
zone –  the time zone, null means default zone
See Also:
now(DateTimeZone)/**
     * Constructs an instance set to the current local time evaluated using
     * ISO chronology in the specified zone.
     * <p>
     * If the specified time zone is null, the default zone is used.
     * Once the constructor is completed, the zone is no longer used.
     *
     * @param zone  the time zone, null means default zone
     * @see #now(DateTimeZone)
     */
    public LocalDateTime(DateTimeZone zone) {
        this(DateTimeUtils.currentTimeMillis(), ISOChronology.getInstance(zone));
    }

    
Constructs an instance set to the current local time evaluated using
specified chronology.

If the chronology is null, ISO chronology in the default time zone is used.
Once the constructor is completed, the zone is no longer used.
Params:
chronology –  the chronology, null means ISOChronology in default zone
See Also:
now(Chronology)/**
     * Constructs an instance set to the current local time evaluated using
     * specified chronology.
     * <p>
     * If the chronology is null, ISO chronology in the default time zone is used.
     * Once the constructor is completed, the zone is no longer used.
     *
     * @param chronology  the chronology, null means ISOChronology in default zone
     * @see #now(Chronology)
     */
    public LocalDateTime(Chronology chronology) {
        this(DateTimeUtils.currentTimeMillis(), chronology);
    }

    //-----------------------------------------------------------------------
    
Constructs an instance set to the local time defined by the specified
instant evaluated using ISO chronology in the default zone.

Once the constructor is completed, the zone is no longer used.
Params:
instant –  the milliseconds from 1970-01-01T00:00:00Z/**
     * Constructs an instance set to the local time defined by the specified
     * instant evaluated using ISO chronology in the default zone.
     * <p>
     * Once the constructor is completed, the zone is no longer used.
     *
     * @param instant  the milliseconds from 1970-01-01T00:00:00Z
     */
    public LocalDateTime(long instant) {
        this(instant, ISOChronology.getInstance());
    }

    
Constructs an instance set to the local time defined by the specified
instant evaluated using ISO chronology in the specified zone.

If the specified time zone is null, the default zone is used.
Once the constructor is completed, the zone is no longer used.
Params:
instant –  the milliseconds from 1970-01-01T00:00:00Z
zone –  the time zone, null means default zone/**
     * Constructs an instance set to the local time defined by the specified
     * instant evaluated using ISO chronology in the specified zone.
     * <p>
     * If the specified time zone is null, the default zone is used.
     * Once the constructor is completed, the zone is no longer used.
     *
     * @param instant  the milliseconds from 1970-01-01T00:00:00Z
     * @param zone  the time zone, null means default zone
     */
    public LocalDateTime(long instant, DateTimeZone zone) {
        this(instant, ISOChronology.getInstance(zone));
    }

    
Constructs an instance set to the local time defined by the specified
instant evaluated using the specified chronology.

If the chronology is null, ISO chronology in the default zone is used.
Once the constructor is completed, the zone is no longer used.
Params:
instant –  the milliseconds from 1970-01-01T00:00:00Z
chronology –  the chronology, null means ISOChronology in default zone/**
     * Constructs an instance set to the local time defined by the specified
     * instant evaluated using the specified chronology.
     * <p>
     * If the chronology is null, ISO chronology in the default zone is used.
     * Once the constructor is completed, the zone is no longer used.
     *
     * @param instant  the milliseconds from 1970-01-01T00:00:00Z
     * @param chronology  the chronology, null means ISOChronology in default zone
     */
    public LocalDateTime(long instant, Chronology chronology) {
        chronology = DateTimeUtils.getChronology(chronology);
        
        long localMillis = chronology.getZone().getMillisKeepLocal(DateTimeZone.UTC, instant);
        iLocalMillis = localMillis;
        iChronology = chronology.withUTC();
    }

    //-----------------------------------------------------------------------
    
Constructs an instance from an Object that represents a datetime.

If the object contains no chronology, ISOChronology is used.
If the object contains no time zone, the default zone is used.
Once the constructor is completed, the zone is no longer used.
 The recognised object types are defined in ConverterManager and include ReadablePartial, ReadableInstant, String, Calendar and Date. The String formats are described by ISODateTimeFormat.localDateOptionalTimeParser(). The default String converter ignores the zone and only parses the field values. 
Params:
instant –  the datetime object
Throws:
IllegalArgumentException – if the instant is invalid/**
     * Constructs an instance from an Object that represents a datetime.
     * <p>
     * If the object contains no chronology, <code>ISOChronology</code> is used.
     * If the object contains no time zone, the default zone is used.
     * Once the constructor is completed, the zone is no longer used.
     * <p>
     * The recognised object types are defined in
     * {@link org.joda.time.convert.ConverterManager ConverterManager} and
     * include ReadablePartial, ReadableInstant, String, Calendar and Date.
     * The String formats are described by {@link ISODateTimeFormat#localDateOptionalTimeParser()}.
     * The default String converter ignores the zone and only parses the field values.
     *
     * @param instant  the datetime object
     * @throws IllegalArgumentException if the instant is invalid
     */
    public LocalDateTime(Object instant) {
        this(instant, (Chronology) null);
    }

    
Constructs an instance from an Object that represents a datetime,
forcing the time zone to that specified.

If the object contains no chronology, ISOChronology is used.
If the specified time zone is null, the default zone is used.
Once the constructor is completed, the zone is no longer used.
 The recognised object types are defined in ConverterManager and include ReadablePartial, ReadableInstant, String, Calendar and Date. The String formats are described by ISODateTimeFormat.localDateOptionalTimeParser(). The default String converter ignores the zone and only parses the field values. 
Params:
instant –  the datetime object
zone –  the time zone
Throws:
IllegalArgumentException – if the instant is invalid/**
     * Constructs an instance from an Object that represents a datetime,
     * forcing the time zone to that specified.
     * <p>
     * If the object contains no chronology, <code>ISOChronology</code> is used.
     * If the specified time zone is null, the default zone is used.
     * Once the constructor is completed, the zone is no longer used.
     * <p>
     * The recognised object types are defined in
     * {@link org.joda.time.convert.ConverterManager ConverterManager} and
     * include ReadablePartial, ReadableInstant, String, Calendar and Date.
     * The String formats are described by {@link ISODateTimeFormat#localDateOptionalTimeParser()}.
     * The default String converter ignores the zone and only parses the field values.
     *
     * @param instant  the datetime object
     * @param zone  the time zone
     * @throws IllegalArgumentException if the instant is invalid
     */
    public LocalDateTime(Object instant, DateTimeZone zone) {
        PartialConverter converter = ConverterManager.getInstance().getPartialConverter(instant);
        Chronology chronology = converter.getChronology(instant, zone);
        chronology = DateTimeUtils.getChronology(chronology);
        iChronology = chronology.withUTC();
        int[] values = converter.getPartialValues(this, instant, chronology, ISODateTimeFormat.localDateOptionalTimeParser());
        iLocalMillis = iChronology.getDateTimeMillis(values[0], values[1], values[2], values[3]);
    }

    
Constructs an instance from an Object that represents a datetime,
using the specified chronology.
 If the chronology is null, ISO in the default time zone is used. Once the constructor is completed, the zone is no longer used. If the instant contains a chronology, it will be ignored. For example, passing a LocalDate and a different chronology will return a date with the year/month/day from the date applied unaltered to the specified chronology. 
 The recognised object types are defined in ConverterManager and include ReadablePartial, ReadableInstant, String, Calendar and Date. The String formats are described by ISODateTimeFormat.localDateOptionalTimeParser(). The default String converter ignores the zone and only parses the field values. 
Params:
instant –  the datetime object
chronology –  the chronology
Throws:
IllegalArgumentException – if the instant is invalid/**
     * Constructs an instance from an Object that represents a datetime,
     * using the specified chronology.
     * <p>
     * If the chronology is null, ISO in the default time zone is used.
     * Once the constructor is completed, the zone is no longer used.
     * If the instant contains a chronology, it will be ignored.
     * For example, passing a {@code LocalDate} and a different chronology
     * will return a date with the year/month/day from the date applied
     * unaltered to the specified chronology.
     * <p>
     * The recognised object types are defined in
     * {@link org.joda.time.convert.ConverterManager ConverterManager} and
     * include ReadablePartial, ReadableInstant, String, Calendar and Date.
     * The String formats are described by {@link ISODateTimeFormat#localDateOptionalTimeParser()}.
     * The default String converter ignores the zone and only parses the field values.
     *
     * @param instant  the datetime object
     * @param chronology  the chronology
     * @throws IllegalArgumentException if the instant is invalid
     */
    public LocalDateTime(Object instant, Chronology chronology) {
        PartialConverter converter = ConverterManager.getInstance().getPartialConverter(instant);
        chronology = converter.getChronology(instant, chronology);
        chronology = DateTimeUtils.getChronology(chronology);
        iChronology = chronology.withUTC();
        int[] values = converter.getPartialValues(this, instant, chronology, ISODateTimeFormat.localDateOptionalTimeParser());
        iLocalMillis = iChronology.getDateTimeMillis(values[0], values[1], values[2], values[3]);
    }

    //-----------------------------------------------------------------------
    
Constructs an instance set to the specified date and time
using ISOChronology.
Params:
year –  the year
monthOfYear –  the month of the year, from 1 to 12
dayOfMonth –  the day of the month, from 1 to 31
hourOfDay –  the hour of the day, from 0 to 23
minuteOfHour –  the minute of the hour, from 0 to 59/**
     * Constructs an instance set to the specified date and time
     * using <code>ISOChronology</code>.
     *
     * @param year  the year
     * @param monthOfYear  the month of the year, from 1 to 12
     * @param dayOfMonth  the day of the month, from 1 to 31
     * @param hourOfDay  the hour of the day, from 0 to 23
     * @param minuteOfHour  the minute of the hour, from 0 to 59
     */
    public LocalDateTime(
            int year,
            int monthOfYear,
            int dayOfMonth,
            int hourOfDay,
            int minuteOfHour) {
        this(year, monthOfYear, dayOfMonth, hourOfDay,
            minuteOfHour, 0, 0, ISOChronology.getInstanceUTC());
    }

    
Constructs an instance set to the specified date and time
using ISOChronology.
Params:
year –  the year
monthOfYear –  the month of the year, from 1 to 12
dayOfMonth –  the day of the month, from 1 to 31
hourOfDay –  the hour of the day, from 0 to 23
minuteOfHour –  the minute of the hour, from 0 to 59
secondOfMinute –  the second of the minute, from 0 to 59/**
     * Constructs an instance set to the specified date and time
     * using <code>ISOChronology</code>.
     *
     * @param year  the year
     * @param monthOfYear  the month of the year, from 1 to 12
     * @param dayOfMonth  the day of the month, from 1 to 31
     * @param hourOfDay  the hour of the day, from 0 to 23
     * @param minuteOfHour  the minute of the hour, from 0 to 59
     * @param secondOfMinute  the second of the minute, from 0 to 59
     */
    public LocalDateTime(
            int year,
            int monthOfYear,
            int dayOfMonth,
            int hourOfDay,
            int minuteOfHour,
            int secondOfMinute) {
        this(year, monthOfYear, dayOfMonth, hourOfDay,
            minuteOfHour, secondOfMinute, 0, ISOChronology.getInstanceUTC());
    }

    
Constructs an instance set to the specified date and time
using ISOChronology.
Params:
year –  the year
monthOfYear –  the month of the year, from 1 to 12
dayOfMonth –  the day of the month, from 1 to 31
hourOfDay –  the hour of the day, from 0 to 23
minuteOfHour –  the minute of the hour, from 0 to 59
secondOfMinute –  the second of the minute, from 0 to 59
millisOfSecond –  the millisecond of the second, from 0 to 999/**
     * Constructs an instance set to the specified date and time
     * using <code>ISOChronology</code>.
     *
     * @param year  the year
     * @param monthOfYear  the month of the year, from 1 to 12
     * @param dayOfMonth  the day of the month, from 1 to 31
     * @param hourOfDay  the hour of the day, from 0 to 23
     * @param minuteOfHour  the minute of the hour, from 0 to 59
     * @param secondOfMinute  the second of the minute, from 0 to 59
     * @param millisOfSecond  the millisecond of the second, from 0 to 999
     */
    public LocalDateTime(
            int year,
            int monthOfYear,
            int dayOfMonth,
            int hourOfDay,
            int minuteOfHour,
            int secondOfMinute,
            int millisOfSecond) {
        this(year, monthOfYear, dayOfMonth, hourOfDay,
            minuteOfHour, secondOfMinute, millisOfSecond, ISOChronology.getInstanceUTC());
    }

    
Constructs an instance set to the specified date and time
using the specified chronology, whose zone is ignored.

If the chronology is null, ISOChronology is used.
Params:
year –  the year, valid values defined by the chronology
monthOfYear –  the month of the year, valid values defined by the chronology
dayOfMonth –  the day of the month, valid values defined by the chronology
hourOfDay –  the hour of the day, valid values defined by the chronology
minuteOfHour –  the minute of the hour, valid values defined by the chronology
secondOfMinute –  the second of the minute, valid values defined by the chronology
millisOfSecond –  the millisecond of the second, valid values defined by the chronology
chronology –  the chronology, null means ISOChronology in default zone/**
     * Constructs an instance set to the specified date and time
     * using the specified chronology, whose zone is ignored.
     * <p>
     * If the chronology is null, <code>ISOChronology</code> is used.
     *
     * @param year  the year, valid values defined by the chronology
     * @param monthOfYear  the month of the year, valid values defined by the chronology
     * @param dayOfMonth  the day of the month, valid values defined by the chronology
     * @param hourOfDay  the hour of the day, valid values defined by the chronology
     * @param minuteOfHour  the minute of the hour, valid values defined by the chronology
     * @param secondOfMinute  the second of the minute, valid values defined by the chronology
     * @param millisOfSecond  the millisecond of the second, valid values defined by the chronology
     * @param chronology  the chronology, null means ISOChronology in default zone
     */
    public LocalDateTime(
            int year,
            int monthOfYear,
            int dayOfMonth,
            int hourOfDay,
            int minuteOfHour,
            int secondOfMinute,
            int millisOfSecond,
            Chronology chronology) {
        super();
        chronology = DateTimeUtils.getChronology(chronology).withUTC();
        long instant = chronology.getDateTimeMillis(year, monthOfYear, dayOfMonth,
            hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond);
        iChronology = chronology;
        iLocalMillis = instant;
    }

    
Handle broken serialization from other tools.
Returns:
the resolved object, not null/**
     * Handle broken serialization from other tools.
     * @return the resolved object, not null
     */
    private Object readResolve() {
        if (iChronology == null) {
            return new LocalDateTime(iLocalMillis, ISOChronology.getInstanceUTC());
        }
        if (DateTimeZone.UTC.equals(iChronology.getZone()) == false) {
            return new LocalDateTime(iLocalMillis, iChronology.withUTC());
        }
        return this;
    }

    //-----------------------------------------------------------------------
    
Gets the number of fields in this partial, which is four.
The supported fields are Year, MonthOfDay, DayOfMonth and MillisOfDay.
Returns:
the field count, four/**
     * Gets the number of fields in this partial, which is four.
     * The supported fields are Year, MonthOfDay, DayOfMonth and MillisOfDay.
     *
     * @return the field count, four
     */
    public int size() {
        return 4;
    }

    
Gets the field for a specific index in the chronology specified.

This method must not use any instance variables.
Params:
index –  the index to retrieve
chrono –  the chronology to use
Returns:
the field/**
     * Gets the field for a specific index in the chronology specified.
     * <p>
     * This method must not use any instance variables.
     *
     * @param index  the index to retrieve
     * @param chrono  the chronology to use
     * @return the field
     */
    protected DateTimeField getField(int index, Chronology chrono) {
        switch (index) {
            case YEAR:
                return chrono.year();
            case MONTH_OF_YEAR:
                return chrono.monthOfYear();
            case DAY_OF_MONTH:
                return chrono.dayOfMonth();
            case MILLIS_OF_DAY:
                return chrono.millisOfDay();
            default:
                throw new IndexOutOfBoundsException("Invalid index: " + index);
        }
    }

    
Gets the value of the field at the specified index.

This method is required to support the ReadablePartial
interface. The supported fields are Year, MonthOfDay, DayOfMonth and MillisOfDay.
Params:
index –  the index, zero to two
Throws:
IndexOutOfBoundsException – if the index is invalid
Returns:
the value/**
     * Gets the value of the field at the specified index.
     * <p>
     * This method is required to support the <code>ReadablePartial</code>
     * interface. The supported fields are Year, MonthOfDay, DayOfMonth and MillisOfDay.
     *
     * @param index  the index, zero to two
     * @return the value
     * @throws IndexOutOfBoundsException if the index is invalid
     */
    public int getValue(int index) {
        switch (index) {
            case YEAR:
                return getChronology().year().get(getLocalMillis());
            case MONTH_OF_YEAR:
                return getChronology().monthOfYear().get(getLocalMillis());
            case DAY_OF_MONTH:
                return getChronology().dayOfMonth().get(getLocalMillis());
            case MILLIS_OF_DAY:
                return getChronology().millisOfDay().get(getLocalMillis());
            default:
                throw new IndexOutOfBoundsException("Invalid index: " + index);
        }
    }

    //-----------------------------------------------------------------------
    
Get the value of one of the fields of a datetime.

This method gets the value of the specified field.
For example:
DateTime dt = new DateTime();
int year = dt.get(DateTimeFieldType.year());

Params:
type –  a field type, usually obtained from DateTimeFieldType, not null
Throws:
IllegalArgumentException – if the field type is null
Returns:
the value of that field/**
     * Get the value of one of the fields of a datetime.
     * <p>
     * This method gets the value of the specified field.
     * For example:
     * <pre>
     * DateTime dt = new DateTime();
     * int year = dt.get(DateTimeFieldType.year());
     * </pre>
     *
     * @param type  a field type, usually obtained from DateTimeFieldType, not null
     * @return the value of that field
     * @throws IllegalArgumentException if the field type is null
     */
    public int get(DateTimeFieldType type) {
        if (type == null) {
            throw new IllegalArgumentException("The DateTimeFieldType must not be null");
        }
        return type.getField(getChronology()).get(getLocalMillis());
    }

    
Checks if the field type specified is supported by this local datetime and chronology. This can be used to avoid exceptions in get(DateTimeFieldType). 
Params:
type –  a field type, usually obtained from DateTimeFieldType
Returns:
true if the field type is supported/**
     * Checks if the field type specified is supported by this
     * local datetime and chronology.
     * This can be used to avoid exceptions in {@link #get(DateTimeFieldType)}.
     *
     * @param type  a field type, usually obtained from DateTimeFieldType
     * @return true if the field type is supported
     */
    public boolean isSupported(DateTimeFieldType type) {
        if (type == null) {
            return false;
        }
        return type.getField(getChronology()).isSupported();
    }

    
Checks if the duration type specified is supported by this
local datetime and chronology.
Params:
type –  a duration type, usually obtained from DurationFieldType
Returns:
true if the field type is supported/**
     * Checks if the duration type specified is supported by this
     * local datetime and chronology.
     *
     * @param type  a duration type, usually obtained from DurationFieldType
     * @return true if the field type is supported
     */
    public boolean isSupported(DurationFieldType type) {
        if (type == null) {
            return false;
        }
        return type.getField(getChronology()).isSupported();
    }

    //-----------------------------------------------------------------------
    
Gets the milliseconds of the datetime instant from the Java epoch
of 1970-01-01T00:00:00 (not fixed to any specific time zone).
Returns:
the number of milliseconds since 1970-01-01T00:00:00
Since:
1.5 (previously private)/**
     * Gets the milliseconds of the datetime instant from the Java epoch
     * of 1970-01-01T00:00:00 (not fixed to any specific time zone).
     *
     * @return the number of milliseconds since 1970-01-01T00:00:00
     * @since 1.5 (previously private)
     */
    protected long getLocalMillis() {
        return iLocalMillis;
    }

    
Gets the chronology of the datetime.
Returns:
the Chronology that the datetime is using/**
     * Gets the chronology of the datetime.
     *
     * @return the Chronology that the datetime is using
     */
    public Chronology getChronology() {
        return iChronology;
    }

    //-----------------------------------------------------------------------
    
Compares this ReadablePartial with another returning true if the chronology,
field types and values are equal.
Params:
partial –  an object to check against
Returns:
true if fields and values are equal/**
     * Compares this ReadablePartial with another returning true if the chronology,
     * field types and values are equal.
     *
     * @param partial  an object to check against
     * @return true if fields and values are equal
     */
    public boolean equals(Object partial) {
        // override to perform faster
        if (this == partial) {
            return true;
        }
        if (partial instanceof LocalDateTime) {
            LocalDateTime other = (LocalDateTime) partial;
            if (iChronology.equals(other.iChronology)) {
                return iLocalMillis == other.iLocalMillis;
            }
        }
        return super.equals(partial);
    }

    
Compares this partial with another returning an integer
indicating the order.

The fields are compared in order, from largest to smallest.
The first field that is non-equal is used to determine the result.

The specified object must be a partial instance whose field types
match those of this partial.
Params:
partial –  an object to check against
Throws:
ClassCastException – if the partial is the wrong class
 or if it has field types that don't match
NullPointerException – if the partial is null
Returns:
negative if this is less, zero if equal, positive if greater/**
     * Compares this partial with another returning an integer
     * indicating the order.
     * <p>
     * The fields are compared in order, from largest to smallest.
     * The first field that is non-equal is used to determine the result.
     * <p>
     * The specified object must be a partial instance whose field types
     * match those of this partial.
     *
     * @param partial  an object to check against
     * @return negative if this is less, zero if equal, positive if greater
     * @throws ClassCastException if the partial is the wrong class
     *  or if it has field types that don't match
     * @throws NullPointerException if the partial is null
     */
    public int compareTo(ReadablePartial partial) {
        // override to perform faster
        if (this == partial) {
            return 0;
        }
        if (partial instanceof LocalDateTime) {
            LocalDateTime other = (LocalDateTime) partial;
            if (iChronology.equals(other.iChronology)) {
                return (iLocalMillis < other.iLocalMillis ? -1 :
                            (iLocalMillis == other.iLocalMillis ? 0 : 1));

            }
        }
        return super.compareTo(partial);
    }

    //-----------------------------------------------------------------------
    
Converts this object to a DateTime using the default zone.

When the time zone is applied, the local date-time may be affected by daylight saving.
In a daylight saving gap, when the local time does not exist,
this method will throw an exception.
In a daylight saving overlap, when the same local time occurs twice,
this method returns the first occurrence of the local time.
Throws:
IllegalInstantException – if the local time does not exist when the time zone is applied
Returns:
this/**
     * Converts this object to a DateTime using the default zone.
     * <p>
     * When the time zone is applied, the local date-time may be affected by daylight saving.
     * In a daylight saving gap, when the local time does not exist,
     * this method will throw an exception.
     * In a daylight saving overlap, when the same local time occurs twice,
     * this method returns the first occurrence of the local time.
     * 
     * @return <code>this</code>
     * @throws IllegalInstantException if the local time does not exist when the time zone is applied
     */
    public DateTime toDateTime() {
        return toDateTime((DateTimeZone) null);
    }

    
Converts this object to a DateTime using the specified zone.

When the time zone is applied, the local date-time may be affected by daylight saving.
In a daylight saving gap, when the local time does not exist,
this method will throw an exception.
In a daylight saving overlap, when the same local time occurs twice,
this method returns the first occurrence of the local time.
Params:
zone – time zone to apply, or default if null
Throws:
IllegalInstantException – if the local time does not exist when the time zone is applied
Returns:
a DateTime using the same millis/**
     * Converts this object to a DateTime using the specified zone.
     * <p>
     * When the time zone is applied, the local date-time may be affected by daylight saving.
     * In a daylight saving gap, when the local time does not exist,
     * this method will throw an exception.
     * In a daylight saving overlap, when the same local time occurs twice,
     * this method returns the first occurrence of the local time.
     * 
     * @param zone time zone to apply, or default if null
     * @return a DateTime using the same millis
     * @throws IllegalInstantException if the local time does not exist when the time zone is applied
     */
    public DateTime toDateTime(DateTimeZone zone) {
        zone = DateTimeUtils.getZone(zone);
        Chronology chrono = iChronology.withZone(zone);
        return new DateTime(
                getYear(), getMonthOfYear(), getDayOfMonth(),
                getHourOfDay(), getMinuteOfHour(),
                getSecondOfMinute(), getMillisOfSecond(), chrono);
    }

    //-----------------------------------------------------------------------
    
Converts this object to a LocalDate with the same date and chronology.
Returns:
a LocalDate with the same date and chronology/**
     * Converts this object to a LocalDate with the same date and chronology.
     *
     * @return a LocalDate with the same date and chronology
     */
    public LocalDate toLocalDate() {
        return new LocalDate(getLocalMillis(), getChronology());
    }

    
Converts this object to a LocalTime with the same time and chronology.
Returns:
a LocalTime with the same time and chronology/**
     * Converts this object to a LocalTime with the same time and chronology.
     *
     * @return a LocalTime with the same time and chronology
     */
    public LocalTime toLocalTime() {
        return new LocalTime(getLocalMillis(), getChronology());
    }

    //-----------------------------------------------------------------------
    
Get the date time as a java.util.Date.

The Date object created has exactly the same fields as this
date-time, except when the time would be invalid due to a daylight savings
gap. In that case, the time will be set to the earliest valid time after the gap.

In the case of a daylight savings overlap, the earlier instant is selected.

Converting to a JDK Date is full of complications as the JDK Date constructor
doesn't behave as you might expect around DST transitions. This method works
by taking a first guess and then adjusting. This also handles the situation
where the JDK time zone data differs from the Joda-Time time zone data.
Returns:
a Date initialised with this date-time, never null
Since:
2.0/**
     * Get the date time as a <code>java.util.Date</code>.
     * <p>
     * The <code>Date</code> object created has exactly the same fields as this
     * date-time, except when the time would be invalid due to a daylight savings
     * gap. In that case, the time will be set to the earliest valid time after the gap.
     * <p>
     * In the case of a daylight savings overlap, the earlier instant is selected.
     * <p>
     * Converting to a JDK Date is full of complications as the JDK Date constructor
     * doesn't behave as you might expect around DST transitions. This method works
     * by taking a first guess and then adjusting. This also handles the situation
     * where the JDK time zone data differs from the Joda-Time time zone data.
     *
     * @return a Date initialised with this date-time, never null
     * @since 2.0
     */
    @SuppressWarnings("deprecation")
    public Date toDate() {
        int dom = getDayOfMonth();
        Date date = new Date(getYear() - 1900, getMonthOfYear() - 1, dom,
                        getHourOfDay(), getMinuteOfHour(), getSecondOfMinute());
        date.setTime(date.getTime() + getMillisOfSecond());
        return correctDstTransition(date, TimeZone.getDefault());
    }

    
Get the date time as a java.util.Date using the specified time zone.

The Date object created has exactly the same fields as this
date-time, except when the time would be invalid due to a daylight savings
gap. In that case, the time will be set to the earliest valid time after the gap.

In the case of a daylight savings overlap, the earlier instant is selected.

Converting to a JDK Date is full of complications as the JDK Date constructor
doesn't behave as you might expect around DST transitions. This method works
by taking a first guess and then adjusting. This also handles the situation
where the JDK time zone data differs from the Joda-Time time zone data.
 Unlike toDate(), this implementation does not rely on Java's synchronized time zone initialization logic, and should demonstrate better concurrent performance characteristics. 
Returns:
a Date initialised with this date-time, never null
Since:
2.3/**
     * Get the date time as a <code>java.util.Date</code> using the specified time zone.
     * <p>
     * The <code>Date</code> object created has exactly the same fields as this
     * date-time, except when the time would be invalid due to a daylight savings
     * gap. In that case, the time will be set to the earliest valid time after the gap.
     * <p>
     * In the case of a daylight savings overlap, the earlier instant is selected.
     * <p>
     * Converting to a JDK Date is full of complications as the JDK Date constructor
     * doesn't behave as you might expect around DST transitions. This method works
     * by taking a first guess and then adjusting. This also handles the situation
     * where the JDK time zone data differs from the Joda-Time time zone data.
     * <p>
     * Unlike {@link #toDate()}, this implementation does not rely on Java's synchronized
     * time zone initialization logic, and should demonstrate better concurrent performance
     * characteristics.
     *
     * @return a Date initialised with this date-time, never null
     * @since 2.3
     */
    public Date toDate(final TimeZone timeZone) {
        final Calendar calendar = Calendar.getInstance(timeZone);
        calendar.clear();
        calendar.set(getYear(), getMonthOfYear() - 1, getDayOfMonth(),
                    getHourOfDay(), getMinuteOfHour(), getSecondOfMinute());
        Date date = calendar.getTime();
        date.setTime(date.getTime() + getMillisOfSecond());
        return correctDstTransition(date, timeZone);
    }

    
Correct date in case of DST overlap.

The Date object created has exactly the same fields as this
date-time, except when the time would be invalid due to a daylight savings
gap. In that case, the time will be set to the earliest valid time after the gap.

In the case of a daylight savings overlap, the earlier instant is selected.

Converting to a JDK Date is full of complications as the JDK Date constructor
doesn't behave as you might expect around DST transitions. This method works
by taking a first guess and then adjusting. This also handles the situation
where the JDK time zone data differs from the Joda-Time time zone data.
See Also:
toDate()/**
     * Correct <code>date</code> in case of DST overlap.
     * <p>
     * The <code>Date</code> object created has exactly the same fields as this
     * date-time, except when the time would be invalid due to a daylight savings
     * gap. In that case, the time will be set to the earliest valid time after the gap.
     * <p>
     * In the case of a daylight savings overlap, the earlier instant is selected.
     * <p>
     * Converting to a JDK Date is full of complications as the JDK Date constructor
     * doesn't behave as you might expect around DST transitions. This method works
     * by taking a first guess and then adjusting. This also handles the situation
     * where the JDK time zone data differs from the Joda-Time time zone data.
     * @see #toDate()
     */
    private Date correctDstTransition(Date date, final TimeZone timeZone) {
        Calendar calendar = Calendar.getInstance(timeZone);
        calendar.setTime(date);
        LocalDateTime check = LocalDateTime.fromCalendarFields(calendar);
        if (check.isBefore(this)) {
            // DST gap
            // move forward in units of one minute until equal/after
            while (check.isBefore(this)) {
                calendar.setTimeInMillis(calendar.getTimeInMillis() + 60000);
                check = LocalDateTime.fromCalendarFields(calendar);
            }
            // move back in units of one second until date wrong
            while (check.isBefore(this) == false) {
                calendar.setTimeInMillis(calendar.getTimeInMillis() - 1000);
                check = LocalDateTime.fromCalendarFields(calendar);
            }
            calendar.setTimeInMillis(calendar.getTimeInMillis() + 1000);
        } else if (check.equals(this)) {
            // check for DST overlap
            final Calendar earlier = Calendar.getInstance(timeZone);
            earlier.setTimeInMillis(calendar.getTimeInMillis() - timeZone.getDSTSavings());
            check = LocalDateTime.fromCalendarFields(earlier);
            if (check.equals(this)) {
                calendar = earlier;
            }
        }
        return calendar.getTime();
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime with different local millis.

The returned object will be a new instance of the same type.
Only the millis will change, the chronology is kept.
The returned object will be either be a new instance or this.
Params:
newMillis –  the new millis, from 1970-01-01T00:00:00
Returns:
a copy of this datetime with different millis/**
     * Returns a copy of this datetime with different local millis.
     * <p>
     * The returned object will be a new instance of the same type.
     * Only the millis will change, the chronology is kept.
     * The returned object will be either be a new instance or <code>this</code>.
     *
     * @param newMillis  the new millis, from 1970-01-01T00:00:00
     * @return a copy of this datetime with different millis
     */
    LocalDateTime withLocalMillis(long newMillis) {
        return (newMillis == getLocalMillis() ? this : new LocalDateTime(newMillis, getChronology()));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime with the specified date,
retaining the time fields.

If the date is already the date passed in, then this is returned.

To set a single field use the properties, for example:
DateTime set = dt.monthOfYear().setCopy(6);

Params:
year –  the new year value
monthOfYear –  the new monthOfYear value
dayOfMonth –  the new dayOfMonth value
Throws:
IllegalArgumentException – if any value if invalid
Returns:
a copy of this datetime with a different date/**
     * Returns a copy of this datetime with the specified date,
     * retaining the time fields.
     * <p>
     * If the date is already the date passed in, then <code>this</code> is returned.
     * <p>
     * To set a single field use the properties, for example:
     * <pre>
     * DateTime set = dt.monthOfYear().setCopy(6);
     * </pre>
     *
     * @param year  the new year value
     * @param monthOfYear  the new monthOfYear value
     * @param dayOfMonth  the new dayOfMonth value
     * @return a copy of this datetime with a different date
     * @throws IllegalArgumentException if any value if invalid
     */
    public LocalDateTime withDate(int year, int monthOfYear, int dayOfMonth) {
        Chronology chrono = getChronology();
        long instant = getLocalMillis();
        instant = chrono.year().set(instant, year);
        instant = chrono.monthOfYear().set(instant, monthOfYear);
        instant = chrono.dayOfMonth().set(instant, dayOfMonth);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime with the specified time,
retaining the date fields.

If the time is already the time passed in, then this is returned.

To set a single field use the properties, for example:
LocalDateTime set = dt.hourOfDay().setCopy(6);

Params:
hourOfDay –  the hour of the day
minuteOfHour –  the minute of the hour
secondOfMinute –  the second of the minute
millisOfSecond –  the millisecond of the second
Throws:
IllegalArgumentException – if any value if invalid
Returns:
a copy of this datetime with a different time/**
     * Returns a copy of this datetime with the specified time,
     * retaining the date fields.
     * <p>
     * If the time is already the time passed in, then <code>this</code> is returned.
     * <p>
     * To set a single field use the properties, for example:
     * <pre>
     * LocalDateTime set = dt.hourOfDay().setCopy(6);
     * </pre>
     *
     * @param hourOfDay  the hour of the day
     * @param minuteOfHour  the minute of the hour
     * @param secondOfMinute  the second of the minute
     * @param millisOfSecond  the millisecond of the second
     * @return a copy of this datetime with a different time
     * @throws IllegalArgumentException if any value if invalid
     */
    public LocalDateTime withTime(int hourOfDay, int minuteOfHour, int secondOfMinute, int millisOfSecond) {
        Chronology chrono = getChronology();
        long instant = getLocalMillis();
        instant = chrono.hourOfDay().set(instant, hourOfDay);
        instant = chrono.minuteOfHour().set(instant, minuteOfHour);
        instant = chrono.secondOfMinute().set(instant, secondOfMinute);
        instant = chrono.millisOfSecond().set(instant, millisOfSecond);
        return withLocalMillis(instant);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime with the partial set of fields
replacing those from this instance.

For example, if the partial is a TimeOfDay then the time fields
would be changed in the returned instance.
If the partial is null, then this is returned.
Params:
partial –  the partial set of fields to apply to this datetime, null ignored
Throws:
IllegalArgumentException – if any value is invalid
Returns:
a copy of this datetime with a different set of fields/**
     * Returns a copy of this datetime with the partial set of fields
     * replacing those from this instance.
     * <p>
     * For example, if the partial is a <code>TimeOfDay</code> then the time fields
     * would be changed in the returned instance.
     * If the partial is null, then <code>this</code> is returned.
     *
     * @param partial  the partial set of fields to apply to this datetime, null ignored
     * @return a copy of this datetime with a different set of fields
     * @throws IllegalArgumentException if any value is invalid
     */
    public LocalDateTime withFields(ReadablePartial partial) {
        if (partial == null) {
            return this;
        }
        return withLocalMillis(getChronology().set(partial, getLocalMillis()));
    }

    
Returns a copy of this datetime with the specified field set to a new value.

For example, if the field type is hourOfDay then the hour of day
field would be changed in the returned instance.
If the field type is null, then this is returned.

These three lines are equivalent:
LocalDateTime updated = dt.withField(DateTimeFieldType.dayOfMonth(), 6);
LocalDateTime updated = dt.dayOfMonth().setCopy(6);
LocalDateTime updated = dt.property(DateTimeFieldType.dayOfMonth()).setCopy(6);

Params:
fieldType –  the field type to set, not null
value –  the value to set
Throws:
IllegalArgumentException – if the value is null or invalid
Returns:
a copy of this datetime with the field set/**
     * Returns a copy of this datetime with the specified field set to a new value.
     * <p>
     * For example, if the field type is <code>hourOfDay</code> then the hour of day
     * field would be changed in the returned instance.
     * If the field type is null, then <code>this</code> is returned.
     * <p>
     * These three lines are equivalent:
     * <pre>
     * LocalDateTime updated = dt.withField(DateTimeFieldType.dayOfMonth(), 6);
     * LocalDateTime updated = dt.dayOfMonth().setCopy(6);
     * LocalDateTime updated = dt.property(DateTimeFieldType.dayOfMonth()).setCopy(6);
     * </pre>
     *
     * @param fieldType  the field type to set, not null
     * @param value  the value to set
     * @return a copy of this datetime with the field set
     * @throws IllegalArgumentException if the value is null or invalid
     */
    public LocalDateTime withField(DateTimeFieldType fieldType, int value) {
        if (fieldType == null) {
            throw new IllegalArgumentException("Field must not be null");
        }
        long instant = fieldType.getField(getChronology()).set(getLocalMillis(), value);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime with the value of the specified
field increased.

If the addition is zero or the field is null, then this is returned.

These three lines are equivalent:
LocalDateTime added = dt.withFieldAdded(DurationFieldType.years(), 6);
LocalDateTime added = dt.plusYears(6);
LocalDateTime added = dt.plus(Period.years(6));

Params:
fieldType –  the field type to add to, not null
amount –  the amount to add
Throws:
IllegalArgumentException – if the value is null or invalid
ArithmeticException – if the result exceeds the internal capacity
Returns:
a copy of this datetime with the field updated/**
     * Returns a copy of this datetime with the value of the specified
     * field increased.
     * <p>
     * If the addition is zero or the field is null, then <code>this</code> is returned.
     * <p>
     * These three lines are equivalent:
     * <pre>
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.years(), 6);
     * LocalDateTime added = dt.plusYears(6);
     * LocalDateTime added = dt.plus(Period.years(6));
     * </pre>
     *
     * @param fieldType  the field type to add to, not null
     * @param amount  the amount to add
     * @return a copy of this datetime with the field updated
     * @throws IllegalArgumentException if the value is null or invalid
     * @throws ArithmeticException if the result exceeds the internal capacity
     */
    public LocalDateTime withFieldAdded(DurationFieldType fieldType, int amount) {
        if (fieldType == null) {
            throw new IllegalArgumentException("Field must not be null");
        }
        if (amount == 0) {
            return this;
        }
        long instant = fieldType.getField(getChronology()).add(getLocalMillis(), amount);
        return withLocalMillis(instant);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime with the specified duration added.

If the addition is zero, then this is returned.
Params:
durationToAdd –  the duration to add to this one, null means zero
scalar –  the amount of times to add, such as -1 to subtract once
Throws:
ArithmeticException – if the result exceeds the internal capacity
Returns:
a copy of this datetime with the duration added/**
     * Returns a copy of this datetime with the specified duration added.
     * <p>
     * If the addition is zero, then <code>this</code> is returned.
     *
     * @param durationToAdd  the duration to add to this one, null means zero
     * @param scalar  the amount of times to add, such as -1 to subtract once
     * @return a copy of this datetime with the duration added
     * @throws ArithmeticException if the result exceeds the internal capacity
     */
    public LocalDateTime withDurationAdded(ReadableDuration durationToAdd, int scalar) {
        if (durationToAdd == null || scalar == 0) {
            return this;
        }
        long instant = getChronology().add(getLocalMillis(), durationToAdd.getMillis(), scalar);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime with the specified period added.

If the addition is zero, then this is returned.
 This method is typically used to add multiple copies of complex period instances. Adding one field is best achieved using methods like withFieldAdded(DurationFieldType, int) or plusYears(int). 
Params:
period –  the period to add to this one, null means zero
scalar –  the amount of times to add, such as -1 to subtract once
Throws:
ArithmeticException – if the result exceeds the internal capacity
Returns:
a copy of this datetime with the period added/**
     * Returns a copy of this datetime with the specified period added.
     * <p>
     * If the addition is zero, then <code>this</code> is returned.
     * <p>
     * This method is typically used to add multiple copies of complex
     * period instances. Adding one field is best achieved using methods
     * like {@link #withFieldAdded(DurationFieldType, int)}
     * or {@link #plusYears(int)}.
     *
     * @param period  the period to add to this one, null means zero
     * @param scalar  the amount of times to add, such as -1 to subtract once
     * @return a copy of this datetime with the period added
     * @throws ArithmeticException if the result exceeds the internal capacity
     */
    public LocalDateTime withPeriodAdded(ReadablePeriod period, int scalar) {
        if (period == null || scalar == 0) {
            return this;
        }
        long instant = getChronology().add(period, getLocalMillis(), scalar);
        return withLocalMillis(instant);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime with the specified duration added.

If the amount is zero or null, then this is returned.
Params:
duration –  the duration to add to this one, null means zero
Throws:
ArithmeticException – if the result exceeds the internal capacity
Returns:
a copy of this datetime with the duration added/**
     * Returns a copy of this datetime with the specified duration added.
     * <p>
     * If the amount is zero or null, then <code>this</code> is returned.
     *
     * @param duration  the duration to add to this one, null means zero
     * @return a copy of this datetime with the duration added
     * @throws ArithmeticException if the result exceeds the internal capacity
     */
    public LocalDateTime plus(ReadableDuration duration) {
        return withDurationAdded(duration, 1);
    }

    
Returns a copy of this datetime with the specified period added.

If the amount is zero or null, then this is returned.
 This method is typically used to add complex period instances. Adding one field is best achieved using methods like plusYears(int). 
Params:
period –  the period to add to this one, null means zero
Throws:
ArithmeticException – if the result exceeds the internal capacity
Returns:
a copy of this datetime with the period added/**
     * Returns a copy of this datetime with the specified period added.
     * <p>
     * If the amount is zero or null, then <code>this</code> is returned.
     * <p>
     * This method is typically used to add complex period instances.
     * Adding one field is best achieved using methods
     * like {@link #plusYears(int)}.
     *
     * @param period  the period to add to this one, null means zero
     * @return a copy of this datetime with the period added
     * @throws ArithmeticException if the result exceeds the internal capacity
     */
    public LocalDateTime plus(ReadablePeriod period) {
        return withPeriodAdded(period, 1);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime plus the specified number of years.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime added = dt.plusYears(6);
LocalDateTime added = dt.plus(Period.years(6));
LocalDateTime added = dt.withFieldAdded(DurationFieldType.years(), 6);

Params:
years –  the amount of years to add, may be negative
Returns:
the new LocalDateTime plus the increased years/**
     * Returns a copy of this datetime plus the specified number of years.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime added = dt.plusYears(6);
     * LocalDateTime added = dt.plus(Period.years(6));
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.years(), 6);
     * </pre>
     *
     * @param years  the amount of years to add, may be negative
     * @return the new LocalDateTime plus the increased years
     */
    public LocalDateTime plusYears(int years) {
        if (years == 0) {
            return this;
        }
        long instant = getChronology().years().add(getLocalMillis(), years);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime plus the specified number of months.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime added = dt.plusMonths(6);
LocalDateTime added = dt.plus(Period.months(6));
LocalDateTime added = dt.withFieldAdded(DurationFieldType.months(), 6);

Params:
months –  the amount of months to add, may be negative
Returns:
the new LocalDateTime plus the increased months/**
     * Returns a copy of this datetime plus the specified number of months.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime added = dt.plusMonths(6);
     * LocalDateTime added = dt.plus(Period.months(6));
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.months(), 6);
     * </pre>
     *
     * @param months  the amount of months to add, may be negative
     * @return the new LocalDateTime plus the increased months
     */
    public LocalDateTime plusMonths(int months) {
        if (months == 0) {
            return this;
        }
        long instant = getChronology().months().add(getLocalMillis(), months);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime plus the specified number of weeks.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime added = dt.plusWeeks(6);
LocalDateTime added = dt.plus(Period.weeks(6));
LocalDateTime added = dt.withFieldAdded(DurationFieldType.weeks(), 6);

Params:
weeks –  the amount of weeks to add, may be negative
Returns:
the new LocalDateTime plus the increased weeks/**
     * Returns a copy of this datetime plus the specified number of weeks.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime added = dt.plusWeeks(6);
     * LocalDateTime added = dt.plus(Period.weeks(6));
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.weeks(), 6);
     * </pre>
     *
     * @param weeks  the amount of weeks to add, may be negative
     * @return the new LocalDateTime plus the increased weeks
     */
    public LocalDateTime plusWeeks(int weeks) {
        if (weeks == 0) {
            return this;
        }
        long instant = getChronology().weeks().add(getLocalMillis(), weeks);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime plus the specified number of days.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime added = dt.plusDays(6);
LocalDateTime added = dt.plus(Period.days(6));
LocalDateTime added = dt.withFieldAdded(DurationFieldType.days(), 6);

Params:
days –  the amount of days to add, may be negative
Returns:
the new LocalDateTime plus the increased days/**
     * Returns a copy of this datetime plus the specified number of days.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime added = dt.plusDays(6);
     * LocalDateTime added = dt.plus(Period.days(6));
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.days(), 6);
     * </pre>
     *
     * @param days  the amount of days to add, may be negative
     * @return the new LocalDateTime plus the increased days
     */
    public LocalDateTime plusDays(int days) {
        if (days == 0) {
            return this;
        }
        long instant = getChronology().days().add(getLocalMillis(), days);
        return withLocalMillis(instant);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime plus the specified number of hours.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime added = dt.plusHours(6);
LocalDateTime added = dt.plus(Period.hours(6));
LocalDateTime added = dt.withFieldAdded(DurationFieldType.hours(), 6);

Params:
hours –  the amount of hours to add, may be negative
Returns:
the new LocalDateTime plus the increased hours/**
     * Returns a copy of this datetime plus the specified number of hours.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime added = dt.plusHours(6);
     * LocalDateTime added = dt.plus(Period.hours(6));
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.hours(), 6);
     * </pre>
     *
     * @param hours  the amount of hours to add, may be negative
     * @return the new LocalDateTime plus the increased hours
     */
    public LocalDateTime plusHours(int hours) {
        if (hours == 0) {
            return this;
        }
        long instant = getChronology().hours().add(getLocalMillis(), hours);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime plus the specified number of minutes.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime added = dt.plusMinutes(6);
LocalDateTime added = dt.plus(Period.minutes(6));
LocalDateTime added = dt.withFieldAdded(DurationFieldType.minutes(), 6);

Params:
minutes –  the amount of minutes to add, may be negative
Returns:
the new LocalDateTime plus the increased minutes/**
     * Returns a copy of this datetime plus the specified number of minutes.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime added = dt.plusMinutes(6);
     * LocalDateTime added = dt.plus(Period.minutes(6));
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.minutes(), 6);
     * </pre>
     *
     * @param minutes  the amount of minutes to add, may be negative
     * @return the new LocalDateTime plus the increased minutes
     */
    public LocalDateTime plusMinutes(int minutes) {
        if (minutes == 0) {
            return this;
        }
        long instant = getChronology().minutes().add(getLocalMillis(), minutes);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime plus the specified number of seconds.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime added = dt.plusSeconds(6);
LocalDateTime added = dt.plus(Period.seconds(6));
LocalDateTime added = dt.withFieldAdded(DurationFieldType.seconds(), 6);

Params:
seconds –  the amount of seconds to add, may be negative
Returns:
the new LocalDateTime plus the increased seconds/**
     * Returns a copy of this datetime plus the specified number of seconds.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime added = dt.plusSeconds(6);
     * LocalDateTime added = dt.plus(Period.seconds(6));
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.seconds(), 6);
     * </pre>
     *
     * @param seconds  the amount of seconds to add, may be negative
     * @return the new LocalDateTime plus the increased seconds
     */
    public LocalDateTime plusSeconds(int seconds) {
        if (seconds == 0) {
            return this;
        }
        long instant = getChronology().seconds().add(getLocalMillis(), seconds);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime plus the specified number of millis.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime added = dt.plusMillis(6);
LocalDateTime added = dt.plus(Period.millis(6));
LocalDateTime added = dt.withFieldAdded(DurationFieldType.millis(), 6);

Params:
millis –  the amount of millis to add, may be negative
Returns:
the new LocalDateTime plus the increased millis/**
     * Returns a copy of this datetime plus the specified number of millis.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime added = dt.plusMillis(6);
     * LocalDateTime added = dt.plus(Period.millis(6));
     * LocalDateTime added = dt.withFieldAdded(DurationFieldType.millis(), 6);
     * </pre>
     *
     * @param millis  the amount of millis to add, may be negative
     * @return the new LocalDateTime plus the increased millis
     */
    public LocalDateTime plusMillis(int millis) {
        if (millis == 0) {
            return this;
        }
        long instant = getChronology().millis().add(getLocalMillis(), millis);
        return withLocalMillis(instant);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime with the specified duration taken away.

If the amount is zero or null, then this is returned.
Params:
duration –  the duration to reduce this instant by
Throws:
ArithmeticException – if the result exceeds the internal capacity
Returns:
a copy of this datetime with the duration taken away/**
     * Returns a copy of this datetime with the specified duration taken away.
     * <p>
     * If the amount is zero or null, then <code>this</code> is returned.
     *
     * @param duration  the duration to reduce this instant by
     * @return a copy of this datetime with the duration taken away
     * @throws ArithmeticException if the result exceeds the internal capacity
     */
    public LocalDateTime minus(ReadableDuration duration) {
        return withDurationAdded(duration, -1);
    }

    
Returns a copy of this datetime with the specified period taken away.

If the amount is zero or null, then this is returned.
 This method is typically used to subtract complex period instances. Subtracting one field is best achieved using methods like minusYears(int). 
Params:
period –  the period to reduce this instant by
Throws:
ArithmeticException – if the result exceeds the internal capacity
Returns:
a copy of this datetime with the period taken away/**
     * Returns a copy of this datetime with the specified period taken away.
     * <p>
     * If the amount is zero or null, then <code>this</code> is returned.
     * <p>
     * This method is typically used to subtract complex period instances.
     * Subtracting one field is best achieved using methods
     * like {@link #minusYears(int)}.
     *
     * @param period  the period to reduce this instant by
     * @return a copy of this datetime with the period taken away
     * @throws ArithmeticException if the result exceeds the internal capacity
     */
    public LocalDateTime minus(ReadablePeriod period) {
        return withPeriodAdded(period, -1);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime minus the specified number of years.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime subtracted = dt.minusYears(6);
LocalDateTime subtracted = dt.minus(Period.years(6));
LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.years(), -6);

Params:
years –  the amount of years to subtract, may be negative
Returns:
the new LocalDateTime minus the increased years/**
     * Returns a copy of this datetime minus the specified number of years.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime subtracted = dt.minusYears(6);
     * LocalDateTime subtracted = dt.minus(Period.years(6));
     * LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.years(), -6);
     * </pre>
     *
     * @param years  the amount of years to subtract, may be negative
     * @return the new LocalDateTime minus the increased years
     */
    public LocalDateTime minusYears(int years) {
        if (years == 0) {
            return this;
        }
        long instant = getChronology().years().subtract(getLocalMillis(), years);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime minus the specified number of months.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime subtracted = dt.minusMonths(6);
LocalDateTime subtracted = dt.minus(Period.months(6));
LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.months(), -6);

Params:
months –  the amount of months to subtract, may be negative
Returns:
the new LocalDateTime minus the increased months/**
     * Returns a copy of this datetime minus the specified number of months.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime subtracted = dt.minusMonths(6);
     * LocalDateTime subtracted = dt.minus(Period.months(6));
     * LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.months(), -6);
     * </pre>
     *
     * @param months  the amount of months to subtract, may be negative
     * @return the new LocalDateTime minus the increased months
     */
    public LocalDateTime minusMonths(int months) {
        if (months == 0) {
            return this;
        }
        long instant = getChronology().months().subtract(getLocalMillis(), months);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime minus the specified number of weeks.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime subtracted = dt.minusWeeks(6);
LocalDateTime subtracted = dt.minus(Period.weeks(6));
LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.weeks(), -6);

Params:
weeks –  the amount of weeks to subtract, may be negative
Returns:
the new LocalDateTime minus the increased weeks/**
     * Returns a copy of this datetime minus the specified number of weeks.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime subtracted = dt.minusWeeks(6);
     * LocalDateTime subtracted = dt.minus(Period.weeks(6));
     * LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.weeks(), -6);
     * </pre>
     *
     * @param weeks  the amount of weeks to subtract, may be negative
     * @return the new LocalDateTime minus the increased weeks
     */
    public LocalDateTime minusWeeks(int weeks) {
        if (weeks == 0) {
            return this;
        }
        long instant = getChronology().weeks().subtract(getLocalMillis(), weeks);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime minus the specified number of days.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime subtracted = dt.minusDays(6);
LocalDateTime subtracted = dt.minus(Period.days(6));
LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.days(), -6);

Params:
days –  the amount of days to subtract, may be negative
Returns:
the new LocalDateTime minus the increased days/**
     * Returns a copy of this datetime minus the specified number of days.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime subtracted = dt.minusDays(6);
     * LocalDateTime subtracted = dt.minus(Period.days(6));
     * LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.days(), -6);
     * </pre>
     *
     * @param days  the amount of days to subtract, may be negative
     * @return the new LocalDateTime minus the increased days
     */
    public LocalDateTime minusDays(int days) {
        if (days == 0) {
            return this;
        }
        long instant = getChronology().days().subtract(getLocalMillis(), days);
        return withLocalMillis(instant);
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime minus the specified number of hours.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime subtracted = dt.minusHours(6);
LocalDateTime subtracted = dt.minus(Period.hours(6));
LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.hours(), -6);

Params:
hours –  the amount of hours to subtract, may be negative
Returns:
the new LocalDateTime minus the increased hours/**
     * Returns a copy of this datetime minus the specified number of hours.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime subtracted = dt.minusHours(6);
     * LocalDateTime subtracted = dt.minus(Period.hours(6));
     * LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.hours(), -6);
     * </pre>
     *
     * @param hours  the amount of hours to subtract, may be negative
     * @return the new LocalDateTime minus the increased hours
     */
    public LocalDateTime minusHours(int hours) {
        if (hours == 0) {
            return this;
        }
        long instant = getChronology().hours().subtract(getLocalMillis(), hours);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime minus the specified number of minutes.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime subtracted = dt.minusMinutes(6);
LocalDateTime subtracted = dt.minus(Period.minutes(6));
LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.minutes(), -6);

Params:
minutes –  the amount of minutes to subtract, may be negative
Returns:
the new LocalDateTime minus the increased minutes/**
     * Returns a copy of this datetime minus the specified number of minutes.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime subtracted = dt.minusMinutes(6);
     * LocalDateTime subtracted = dt.minus(Period.minutes(6));
     * LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.minutes(), -6);
     * </pre>
     *
     * @param minutes  the amount of minutes to subtract, may be negative
     * @return the new LocalDateTime minus the increased minutes
     */
    public LocalDateTime minusMinutes(int minutes) {
        if (minutes == 0) {
            return this;
        }
        long instant = getChronology().minutes().subtract(getLocalMillis(), minutes);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime minus the specified number of seconds.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime subtracted = dt.minusSeconds(6);
LocalDateTime subtracted = dt.minus(Period.seconds(6));
LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.seconds(), -6);

Params:
seconds –  the amount of seconds to subtract, may be negative
Returns:
the new LocalDateTime minus the increased seconds/**
     * Returns a copy of this datetime minus the specified number of seconds.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime subtracted = dt.minusSeconds(6);
     * LocalDateTime subtracted = dt.minus(Period.seconds(6));
     * LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.seconds(), -6);
     * </pre>
     *
     * @param seconds  the amount of seconds to subtract, may be negative
     * @return the new LocalDateTime minus the increased seconds
     */
    public LocalDateTime minusSeconds(int seconds) {
        if (seconds == 0) {
            return this;
        }
        long instant = getChronology().seconds().subtract(getLocalMillis(), seconds);
        return withLocalMillis(instant);
    }

    
Returns a copy of this datetime minus the specified number of millis.

This LocalDateTime instance is immutable and unaffected by this method call.

The following three lines are identical in effect:
LocalDateTime subtracted = dt.minusMillis(6);
LocalDateTime subtracted = dt.minus(Period.millis(6));
LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.millis(), -6);

Params:
millis –  the amount of millis to subtract, may be negative
Returns:
the new LocalDateTime minus the increased millis/**
     * Returns a copy of this datetime minus the specified number of millis.
     * <p>
     * This LocalDateTime instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * LocalDateTime subtracted = dt.minusMillis(6);
     * LocalDateTime subtracted = dt.minus(Period.millis(6));
     * LocalDateTime subtracted = dt.withFieldAdded(DurationFieldType.millis(), -6);
     * </pre>
     *
     * @param millis  the amount of millis to subtract, may be negative
     * @return the new LocalDateTime minus the increased millis
     */
    public LocalDateTime minusMillis(int millis) {
        if (millis == 0) {
            return this;
        }
        long instant = getChronology().millis().subtract(getLocalMillis(), millis);
        return withLocalMillis(instant);
    }

    //-----------------------------------------------------------------------
    
Gets the property object for the specified type, which contains many
useful methods.
Params:
fieldType –  the field type to get the chronology for
Throws:
IllegalArgumentException – if the field is null or unsupported
Returns:
the property object/**
     * Gets the property object for the specified type, which contains many
     * useful methods.
     *
     * @param fieldType  the field type to get the chronology for
     * @return the property object
     * @throws IllegalArgumentException if the field is null or unsupported
     */
    public Property property(DateTimeFieldType fieldType) {
        if (fieldType == null) {
            throw new IllegalArgumentException("The DateTimeFieldType must not be null");
        }
        if (isSupported(fieldType) == false) {
            throw new IllegalArgumentException("Field '" + fieldType + "' is not supported");
        }
        return new Property(this, fieldType.getField(getChronology()));
    }

    //-----------------------------------------------------------------------
    
Get the era field value.
Returns:
the era/**
     * Get the era field value.
     *
     * @return the era
     */
    public int getEra() {
        return getChronology().era().get(getLocalMillis());
    }

    
Get the year of era field value.
Returns:
the year of era/**
     * Get the year of era field value.
     *
     * @return the year of era
     */
    public int getCenturyOfEra() {
        return getChronology().centuryOfEra().get(getLocalMillis());
    }

    
Get the year of era field value.
Returns:
the year of era/**
     * Get the year of era field value.
     *
     * @return the year of era
     */
    public int getYearOfEra() {
        return getChronology().yearOfEra().get(getLocalMillis());
    }

    
Get the year of century field value.
Returns:
the year of century/**
     * Get the year of century field value.
     *
     * @return the year of century
     */
    public int getYearOfCentury() {
        return getChronology().yearOfCentury().get(getLocalMillis());
    }

    
Get the year field value.
Returns:
the year/**
     * Get the year field value.
     *
     * @return the year
     */
    public int getYear() {
        return getChronology().year().get(getLocalMillis());
    }

    
Get the weekyear field value.

The weekyear is the year that matches with the weekOfWeekyear field.
In the standard ISO8601 week algorithm, the first week of the year
is that in which at least 4 days are in the year. As a result of this
definition, day 1 of the first week may be in the previous year.
The weekyear allows you to query the effective year for that day.
Returns:
the weekyear/**
     * Get the weekyear field value.
     * <p>
     * The weekyear is the year that matches with the weekOfWeekyear field.
     * In the standard ISO8601 week algorithm, the first week of the year
     * is that in which at least 4 days are in the year. As a result of this
     * definition, day 1 of the first week may be in the previous year.
     * The weekyear allows you to query the effective year for that day.
     *
     * @return the weekyear
     */
    public int getWeekyear() {
        return getChronology().weekyear().get(getLocalMillis());
    }

    
Get the month of year field value.
Returns:
the month of year/**
     * Get the month of year field value.
     *
     * @return the month of year
     */
    public int getMonthOfYear() {
        return getChronology().monthOfYear().get(getLocalMillis());
    }

    
Get the week of weekyear field value.
 This field is associated with the "weekyear" via getWeekyear(). In the standard ISO8601 week algorithm, the first week of the year is that in which at least 4 days are in the year. As a result of this definition, day 1 of the first week may be in the previous year. 
Returns:
the week of a week based year/**
     * Get the week of weekyear field value.
     * <p>
     * This field is associated with the "weekyear" via {@link #getWeekyear()}.
     * In the standard ISO8601 week algorithm, the first week of the year
     * is that in which at least 4 days are in the year. As a result of this
     * definition, day 1 of the first week may be in the previous year.
     *
     * @return the week of a week based year
     */
    public int getWeekOfWeekyear() {
        return getChronology().weekOfWeekyear().get(getLocalMillis());
    }

    
Get the day of year field value.
Returns:
the day of year/**
     * Get the day of year field value.
     *
     * @return the day of year
     */
    public int getDayOfYear() {
        return getChronology().dayOfYear().get(getLocalMillis());
    }

    
Get the day of month field value.
 The values for the day of month are defined in DateTimeConstants. 
Returns:
the day of month/**
     * Get the day of month field value.
     * <p>
     * The values for the day of month are defined in {@link org.joda.time.DateTimeConstants}.
     *
     * @return the day of month
     */
    public int getDayOfMonth() {
        return getChronology().dayOfMonth().get(getLocalMillis());
    }

    
Get the day of week field value.
 The values for the day of week are defined in DateTimeConstants. 
Returns:
the day of week/**
     * Get the day of week field value.
     * <p>
     * The values for the day of week are defined in {@link org.joda.time.DateTimeConstants}.
     *
     * @return the day of week
     */
    public int getDayOfWeek() {
        return getChronology().dayOfWeek().get(getLocalMillis());
    }

    //-----------------------------------------------------------------------
    
Get the hour of day field value.
Returns:
the hour of day/**
     * Get the hour of day field value.
     *
     * @return the hour of day
     */
    public int getHourOfDay() {
        return getChronology().hourOfDay().get(getLocalMillis());
    }

    
Get the minute of hour field value.
Returns:
the minute of hour/**
     * Get the minute of hour field value.
     *
     * @return the minute of hour
     */
    public int getMinuteOfHour() {
        return getChronology().minuteOfHour().get(getLocalMillis());
    }

    
Get the second of minute field value.
Returns:
the second of minute/**
     * Get the second of minute field value.
     *
     * @return the second of minute
     */
    public int getSecondOfMinute() {
        return getChronology().secondOfMinute().get(getLocalMillis());
    }

    
Get the millis of second field value.
Returns:
the millis of second/**
     * Get the millis of second field value.
     *
     * @return the millis of second
     */
    public int getMillisOfSecond() {
        return getChronology().millisOfSecond().get(getLocalMillis());
    }

    
Get the millis of day field value.
Returns:
the millis of day/**
     * Get the millis of day field value.
     *
     * @return the millis of day
     */
    public int getMillisOfDay() {
        return getChronology().millisOfDay().get(getLocalMillis());
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime with the era field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
era changed.
Params:
era –  the era to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the era field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * era changed.
     *
     * @param era  the era to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withEra(int era) {
        return withLocalMillis(getChronology().era().set(getLocalMillis(), era));
    }

    
Returns a copy of this datetime with the century of era field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
century of era changed.
Params:
centuryOfEra –  the century of era to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the century of era field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * century of era changed.
     *
     * @param centuryOfEra  the century of era to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withCenturyOfEra(int centuryOfEra) {
        return withLocalMillis(getChronology().centuryOfEra().set(getLocalMillis(), centuryOfEra));
    }

    
Returns a copy of this datetime with the year of era field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
year of era changed.
Params:
yearOfEra –  the year of era to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the year of era field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * year of era changed.
     *
     * @param yearOfEra  the year of era to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withYearOfEra(int yearOfEra) {
        return withLocalMillis(getChronology().yearOfEra().set(getLocalMillis(), yearOfEra));
    }

    
Returns a copy of this datetime with the year of century field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
year of century changed.
Params:
yearOfCentury –  the year of century to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the year of century field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * year of century changed.
     *
     * @param yearOfCentury  the year of century to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withYearOfCentury(int yearOfCentury) {
        return withLocalMillis(getChronology().yearOfCentury().set(getLocalMillis(), yearOfCentury));
    }

    
Returns a copy of this datetime with the year field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
year changed.
Params:
year –  the year to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the year field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * year changed.
     *
     * @param year  the year to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withYear(int year) {
        return withLocalMillis(getChronology().year().set(getLocalMillis(), year));
    }

    
Returns a copy of this datetime with the weekyear field updated.

The weekyear is the year that matches with the weekOfWeekyear field.
In the standard ISO8601 week algorithm, the first week of the year
is that in which at least 4 days are in the year. As a result of this
definition, day 1 of the first week may be in the previous year.
The weekyear allows you to query the effective year for that day.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
weekyear changed.
Params:
weekyear –  the weekyear to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the weekyear field updated.
     * <p>
     * The weekyear is the year that matches with the weekOfWeekyear field.
     * In the standard ISO8601 week algorithm, the first week of the year
     * is that in which at least 4 days are in the year. As a result of this
     * definition, day 1 of the first week may be in the previous year.
     * The weekyear allows you to query the effective year for that day.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * weekyear changed.
     *
     * @param weekyear  the weekyear to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withWeekyear(int weekyear) {
        return withLocalMillis(getChronology().weekyear().set(getLocalMillis(), weekyear));
    }

    
Returns a copy of this datetime with the month of year field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
month of year changed.
Params:
monthOfYear –  the month of year to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the month of year field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * month of year changed.
     *
     * @param monthOfYear  the month of year to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withMonthOfYear(int monthOfYear) {
        return withLocalMillis(getChronology().monthOfYear().set(getLocalMillis(), monthOfYear));
    }

    
Returns a copy of this datetime with the week of weekyear field updated.
 This field is associated with the "weekyear" via withWeekyear(int). In the standard ISO8601 week algorithm, the first week of the year is that in which at least 4 days are in the year. As a result of this definition, day 1 of the first week may be in the previous year. 

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
week of weekyear changed.
Params:
weekOfWeekyear –  the week of weekyear to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the week of weekyear field updated.
     * <p>
     * This field is associated with the "weekyear" via {@link #withWeekyear(int)}.
     * In the standard ISO8601 week algorithm, the first week of the year
     * is that in which at least 4 days are in the year. As a result of this
     * definition, day 1 of the first week may be in the previous year.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * week of weekyear changed.
     *
     * @param weekOfWeekyear  the week of weekyear to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withWeekOfWeekyear(int weekOfWeekyear) {
        return withLocalMillis(getChronology().weekOfWeekyear().set(getLocalMillis(), weekOfWeekyear));
    }

    
Returns a copy of this datetime with the day of year field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
day of year changed.
Params:
dayOfYear –  the day of year to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the day of year field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * day of year changed.
     *
     * @param dayOfYear  the day of year to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withDayOfYear(int dayOfYear) {
        return withLocalMillis(getChronology().dayOfYear().set(getLocalMillis(), dayOfYear));
    }

    
Returns a copy of this datetime with the day of month field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
day of month changed.
Params:
dayOfMonth –  the day of month to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the day of month field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * day of month changed.
     *
     * @param dayOfMonth  the day of month to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withDayOfMonth(int dayOfMonth) {
        return withLocalMillis(getChronology().dayOfMonth().set(getLocalMillis(), dayOfMonth));
    }

    
Returns a copy of this datetime with the day of week field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
day of week changed.
Params:
dayOfWeek –  the day of week to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the day of week field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * day of week changed.
     *
     * @param dayOfWeek  the day of week to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withDayOfWeek(int dayOfWeek) {
        return withLocalMillis(getChronology().dayOfWeek().set(getLocalMillis(), dayOfWeek));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this datetime with the hour of day field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
hour of day changed.
Params:
hour –  the hour of day to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the hour of day field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * hour of day changed.
     *
     * @param hour  the hour of day to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withHourOfDay(int hour) {
        return withLocalMillis(getChronology().hourOfDay().set(getLocalMillis(), hour));
    }

    
Returns a copy of this datetime with the minute of hour field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
minute of hour changed.
Params:
minute –  the minute of hour to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the minute of hour field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * minute of hour changed.
     *
     * @param minute  the minute of hour to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withMinuteOfHour(int minute) {
        return withLocalMillis(getChronology().minuteOfHour().set(getLocalMillis(), minute));
    }

    
Returns a copy of this datetime with the second of minute field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
second of minute changed.
Params:
second –  the second of minute to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the second of minute field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * second of minute changed.
     *
     * @param second  the second of minute to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withSecondOfMinute(int second) {
        return withLocalMillis(getChronology().secondOfMinute().set(getLocalMillis(), second));
    }

    
Returns a copy of this datetime with the millis of second field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
millis of second changed.
Params:
millis –  the millis of second to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the millis of second field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * millis of second changed.
     *
     * @param millis  the millis of second to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withMillisOfSecond(int millis) {
        return withLocalMillis(getChronology().millisOfSecond().set(getLocalMillis(), millis));
    }

    
Returns a copy of this datetime with the millis of day field updated.

LocalDateTime is immutable, so there are no set methods.
Instead, this method returns a new instance with the value of
millis of day changed.
Params:
millis –  the millis of day to set
Throws:
IllegalArgumentException – if the value is invalid
Returns:
a copy of this object with the field set/**
     * Returns a copy of this datetime with the millis of day field updated.
     * <p>
     * LocalDateTime is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * millis of day changed.
     *
     * @param millis  the millis of day to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     */
    public LocalDateTime withMillisOfDay(int millis) {
        return withLocalMillis(getChronology().millisOfDay().set(getLocalMillis(), millis));
    }

    //-----------------------------------------------------------------------
    
Get the era property which provides access to advanced functionality.
Returns:
the era property/**
     * Get the era property which provides access to advanced functionality.
     *
     * @return the era property
     */
    public Property era() {
        return new Property(this, getChronology().era());
    }

    
Get the century of era property which provides access to advanced functionality.
Returns:
the year of era property/**
     * Get the century of era property which provides access to advanced functionality.
     *
     * @return the year of era property
     */
    public Property centuryOfEra() {
        return new Property(this, getChronology().centuryOfEra());
    }

    
Get the year of century property which provides access to advanced functionality.
Returns:
the year of era property/**
     * Get the year of century property which provides access to advanced functionality.
     *
     * @return the year of era property
     */
    public Property yearOfCentury() {
        return new Property(this, getChronology().yearOfCentury());
    }

    
Get the year of era property which provides access to advanced functionality.
Returns:
the year of era property/**
     * Get the year of era property which provides access to advanced functionality.
     *
     * @return the year of era property
     */
    public Property yearOfEra() {
        return new Property(this, getChronology().yearOfEra());
    }

    
Get the year property which provides access to advanced functionality.
Returns:
the year property/**
     * Get the year property which provides access to advanced functionality.
     *
     * @return the year property
     */
    public Property year() {
        return new Property(this, getChronology().year());
    }

    
Get the weekyear property which provides access to advanced functionality.
Returns:
the weekyear property/**
     * Get the weekyear property which provides access to advanced functionality.
     *
     * @return the weekyear property
     */
    public Property weekyear() {
        return new Property(this, getChronology().weekyear());
    }

    
Get the month of year property which provides access to advanced functionality.
Returns:
the month of year property/**
     * Get the month of year property which provides access to advanced functionality.
     *
     * @return the month of year property
     */
    public Property monthOfYear() {
        return new Property(this, getChronology().monthOfYear());
    }

    
Get the week of a week based year property which provides access to advanced functionality.
Returns:
the week of a week based year property/**
     * Get the week of a week based year property which provides access to advanced functionality.
     *
     * @return the week of a week based year property
     */
    public Property weekOfWeekyear() {
        return new Property(this, getChronology().weekOfWeekyear());
    }

    
Get the day of year property which provides access to advanced functionality.
Returns:
the day of year property/**
     * Get the day of year property which provides access to advanced functionality.
     *
     * @return the day of year property
     */
    public Property dayOfYear() {
        return new Property(this, getChronology().dayOfYear());
    }

    
Get the day of month property which provides access to advanced functionality.
Returns:
the day of month property/**
     * Get the day of month property which provides access to advanced functionality.
     *
     * @return the day of month property
     */
    public Property dayOfMonth() {
        return new Property(this, getChronology().dayOfMonth());
    }

    
Get the day of week property which provides access to advanced functionality.
Returns:
the day of week property/**
     * Get the day of week property which provides access to advanced functionality.
     *
     * @return the day of week property
     */
    public Property dayOfWeek() {
        return new Property(this, getChronology().dayOfWeek());
    }

    //-----------------------------------------------------------------------
    
Get the hour of day field property which provides access to advanced functionality.
Returns:
the hour of day property/**
     * Get the hour of day field property which provides access to advanced functionality.
     * 
     * @return the hour of day property
     */
    public Property hourOfDay() {
        return new Property(this, getChronology().hourOfDay());
    }

    
Get the minute of hour field property which provides access to advanced functionality.
Returns:
the minute of hour property/**
     * Get the minute of hour field property which provides access to advanced functionality.
     * 
     * @return the minute of hour property
     */
    public Property minuteOfHour() {
        return new Property(this, getChronology().minuteOfHour());
    }

    
Get the second of minute field property which provides access to advanced functionality.
Returns:
the second of minute property/**
     * Get the second of minute field property which provides access to advanced functionality.
     * 
     * @return the second of minute property
     */
    public Property secondOfMinute() {
        return new Property(this, getChronology().secondOfMinute());
    }

    
Get the millis of second property which provides access to advanced functionality.
Returns:
the millis of second property/**
     * Get the millis of second property which provides access to advanced functionality.
     * 
     * @return the millis of second property
     */
    public Property millisOfSecond() {
        return new Property(this, getChronology().millisOfSecond());
    }

    
Get the millis of day property which provides access to advanced functionality.
Returns:
the millis of day property/**
     * Get the millis of day property which provides access to advanced functionality.
     * 
     * @return the millis of day property
     */
    public Property millisOfDay() {
        return new Property(this, getChronology().millisOfDay());
    }

    //-----------------------------------------------------------------------
    
Output the date time in ISO8601 format (yyyy-MM-ddTHH:mm:ss.SSS).
Returns:
ISO8601 time formatted string./**
     * Output the date time in ISO8601 format (yyyy-MM-ddTHH:mm:ss.SSS).
     * 
     * @return ISO8601 time formatted string.
     */
    @ToString
    public String toString() {
        return ISODateTimeFormat.dateTime().print(this);
    }

    
Output the date using the specified format pattern.
Params:
pattern –  the pattern specification, null means use toString
See Also:
DateTimeFormat/**
     * Output the date using the specified format pattern.
     *
     * @param pattern  the pattern specification, null means use <code>toString</code>
     * @see org.joda.time.format.DateTimeFormat
     */
    public String toString(String pattern) {
        if (pattern == null) {
            return toString();
        }
        return DateTimeFormat.forPattern(pattern).print(this);
    }

    
Output the date using the specified format pattern.
Params:
pattern –  the pattern specification, null means use toString
locale –  Locale to use, null means default
See Also:
DateTimeFormat/**
     * Output the date using the specified format pattern.
     *
     * @param pattern  the pattern specification, null means use <code>toString</code>
     * @param locale  Locale to use, null means default
     * @see org.joda.time.format.DateTimeFormat
     */
    public String toString(String pattern, Locale locale) throws IllegalArgumentException {
        if (pattern == null) {
            return toString();
        }
        return DateTimeFormat.forPattern(pattern).withLocale(locale).print(this);
    }

    //-----------------------------------------------------------------------
    
LocalDateTime.Property binds a LocalDateTime to a DateTimeField allowing
powerful datetime functionality to be easily accessed.

The simplest use of this class is as an alternative get method, here used to
get the year '1972' (as an int) and the month 'December' (as a String).
LocalDateTime dt = new LocalDateTime(1972, 12, 3, 0, 0);
int year = dt.year().get();
String monthStr = dt.month().getAsText();


Methods are also provided that allow date modification. These return
new instances of LocalDateTime - they do not modify the original.
The example below yields two independent immutable date objects
20 years apart.
LocalDateTime dt = new LocalDateTime(1972, 12, 3, 0, 0);
LocalDateTime dt1920 = dt.year().setCopy(1920);


LocalDateTime.Property itself is thread-safe and immutable, as well as the
LocalDateTime being operated on.
Author:
Stephen Colebourne, Brian S O'Neill
Since:
1.3/**
     * LocalDateTime.Property binds a LocalDateTime to a DateTimeField allowing
     * powerful datetime functionality to be easily accessed.
     * <p>
     * The simplest use of this class is as an alternative get method, here used to
     * get the year '1972' (as an int) and the month 'December' (as a String).
     * <pre>
     * LocalDateTime dt = new LocalDateTime(1972, 12, 3, 0, 0);
     * int year = dt.year().get();
     * String monthStr = dt.month().getAsText();
     * </pre>
     * <p>
     * Methods are also provided that allow date modification. These return
     * new instances of LocalDateTime - they do not modify the original.
     * The example below yields two independent immutable date objects
     * 20 years apart.
     * <pre>
     * LocalDateTime dt = new LocalDateTime(1972, 12, 3, 0, 0);
     * LocalDateTime dt1920 = dt.year().setCopy(1920);
     * </pre>
     * <p>
     * LocalDateTime.Property itself is thread-safe and immutable, as well as the
     * LocalDateTime being operated on.
     *
     * @author Stephen Colebourne
     * @author Brian S O'Neill
     * @since 1.3
     */
    public static final class Property extends AbstractReadableInstantFieldProperty {
        
        
Serialization version /** Serialization version */
        private static final long serialVersionUID = -358138762846288L;
        
        
The instant this property is working against /** The instant this property is working against */
        private transient LocalDateTime iInstant;
        
The field this property is working against /** The field this property is working against */
        private transient DateTimeField iField;
        
        
Constructor.
Params:
instant –  the instant to set
field –  the field to use/**
         * Constructor.
         * 
         * @param instant  the instant to set
         * @param field  the field to use
         */
        Property(LocalDateTime instant, DateTimeField field) {
            super();
            iInstant = instant;
            iField = field;
        }
        
        
Writes the property in a safe serialization format.
/**
         * Writes the property in a safe serialization format.
         */
        private void writeObject(ObjectOutputStream oos) throws IOException {
            oos.writeObject(iInstant);
            oos.writeObject(iField.getType());
        }

        
Reads the property from a safe serialization format.
/**
         * Reads the property from a safe serialization format.
         */
        private void readObject(ObjectInputStream oos) throws IOException, ClassNotFoundException {
            iInstant = (LocalDateTime) oos.readObject();
            DateTimeFieldType type = (DateTimeFieldType) oos.readObject();
            iField = type.getField(iInstant.getChronology());
        }

        //-----------------------------------------------------------------------
        
Gets the field being used.
Returns:
the field/**
         * Gets the field being used.
         * 
         * @return the field
         */
        public DateTimeField getField() {
            return iField;
        }
        
        
Gets the milliseconds of the datetime that this property is linked to.
Returns:
the milliseconds/**
         * Gets the milliseconds of the datetime that this property is linked to.
         * 
         * @return the milliseconds
         */
        protected long getMillis() {
            return iInstant.getLocalMillis();
        }
        
        
Gets the chronology of the datetime that this property is linked to.
Returns:
the chronology
Since:
1.4/**
         * Gets the chronology of the datetime that this property is linked to.
         * 
         * @return the chronology
         * @since 1.4
         */
        protected Chronology getChronology() {
            return iInstant.getChronology();
        }
        
        
Gets the LocalDateTime object linked to this property.
Returns:
the linked LocalDateTime/**
         * Gets the LocalDateTime object linked to this property.
         * 
         * @return the linked LocalDateTime
         */
        public LocalDateTime getLocalDateTime() {
            return iInstant;
        }
        
        //-----------------------------------------------------------------------
        
Adds to this field in a copy of this LocalDateTime.

The LocalDateTime attached to this property is unchanged by this call.
Params:
value –  the value to add to the field in the copy
Throws:
IllegalArgumentException – if the value isn't valid
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Adds to this field in a copy of this LocalDateTime.
         * <p>
         * The LocalDateTime attached to this property is unchanged by this call.
         *
         * @param value  the value to add to the field in the copy
         * @return a copy of the LocalDateTime with the field value changed
         * @throws IllegalArgumentException if the value isn't valid
         */
        public LocalDateTime addToCopy(int value) {
            return iInstant.withLocalMillis(iField.add(iInstant.getLocalMillis(), value));
        }
        
        
Adds to this field in a copy of this LocalDateTime.

The LocalDateTime attached to this property is unchanged by this call.
Params:
value –  the value to add to the field in the copy
Throws:
IllegalArgumentException – if the value isn't valid
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Adds to this field in a copy of this LocalDateTime.
         * <p>
         * The LocalDateTime attached to this property is unchanged by this call.
         *
         * @param value  the value to add to the field in the copy
         * @return a copy of the LocalDateTime with the field value changed
         * @throws IllegalArgumentException if the value isn't valid
         */
        public LocalDateTime addToCopy(long value) {
            return iInstant.withLocalMillis(iField.add(iInstant.getLocalMillis(), value));
        }
        
        
Adds to this field, possibly wrapped, in a copy of this LocalDateTime.
A field wrapped operation only changes this field.
Thus 31st January addWrapField one day goes to the 1st January.

The LocalDateTime attached to this property is unchanged by this call.
Params:
value –  the value to add to the field in the copy
Throws:
IllegalArgumentException – if the value isn't valid
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Adds to this field, possibly wrapped, in a copy of this LocalDateTime.
         * A field wrapped operation only changes this field.
         * Thus 31st January addWrapField one day goes to the 1st January.
         * <p>
         * The LocalDateTime attached to this property is unchanged by this call.
         *
         * @param value  the value to add to the field in the copy
         * @return a copy of the LocalDateTime with the field value changed
         * @throws IllegalArgumentException if the value isn't valid
         */
        public LocalDateTime addWrapFieldToCopy(int value) {
            return iInstant.withLocalMillis(iField.addWrapField(iInstant.getLocalMillis(), value));
        }
        
        //-----------------------------------------------------------------------
        
Sets this field in a copy of the LocalDateTime.

The LocalDateTime attached to this property is unchanged by this call.
Params:
value –  the value to set the field in the copy to
Throws:
IllegalArgumentException – if the value isn't valid
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Sets this field in a copy of the LocalDateTime.
         * <p>
         * The LocalDateTime attached to this property is unchanged by this call.
         *
         * @param value  the value to set the field in the copy to
         * @return a copy of the LocalDateTime with the field value changed
         * @throws IllegalArgumentException if the value isn't valid
         */
        public LocalDateTime setCopy(int value) {
            return iInstant.withLocalMillis(iField.set(iInstant.getLocalMillis(), value));
        }
        
        
Sets this field in a copy of the LocalDateTime to a parsed text value.

The LocalDateTime attached to this property is unchanged by this call.
Params:
text –  the text value to set
locale –  optional locale to use for selecting a text symbol
Throws:
IllegalArgumentException – if the text value isn't valid
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Sets this field in a copy of the LocalDateTime to a parsed text value.
         * <p>
         * The LocalDateTime attached to this property is unchanged by this call.
         *
         * @param text  the text value to set
         * @param locale  optional locale to use for selecting a text symbol
         * @return a copy of the LocalDateTime with the field value changed
         * @throws IllegalArgumentException if the text value isn't valid
         */
        public LocalDateTime setCopy(String text, Locale locale) {
            return iInstant.withLocalMillis(iField.set(iInstant.getLocalMillis(), text, locale));
        }
        
        
Sets this field in a copy of the LocalDateTime to a parsed text value.

The LocalDateTime attached to this property is unchanged by this call.
Params:
text –  the text value to set
Throws:
IllegalArgumentException – if the text value isn't valid
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Sets this field in a copy of the LocalDateTime to a parsed text value.
         * <p>
         * The LocalDateTime attached to this property is unchanged by this call.
         *
         * @param text  the text value to set
         * @return a copy of the LocalDateTime with the field value changed
         * @throws IllegalArgumentException if the text value isn't valid
         */
        public LocalDateTime setCopy(String text) {
            return setCopy(text, null);
        }
        
        //-----------------------------------------------------------------------
        
Returns a new LocalDateTime with this field set to the maximum value
for this field.

This operation is useful for obtaining a LocalDateTime on the last day
of the month, as month lengths vary.
LocalDateTime lastDayOfMonth = dt.dayOfMonth().withMaximumValue();


The LocalDateTime attached to this property is unchanged by this call.
Returns:
a copy of the LocalDateTime with this field set to its maximum/**
         * Returns a new LocalDateTime with this field set to the maximum value
         * for this field.
         * <p>
         * This operation is useful for obtaining a LocalDateTime on the last day
         * of the month, as month lengths vary.
         * <pre>
         * LocalDateTime lastDayOfMonth = dt.dayOfMonth().withMaximumValue();
         * </pre>
         * <p>
         * The LocalDateTime attached to this property is unchanged by this call.
         *
         * @return a copy of the LocalDateTime with this field set to its maximum
         */
        public LocalDateTime withMaximumValue() {
            return setCopy(getMaximumValue());
        }
        
        
Returns a new LocalDateTime with this field set to the minimum value
for this field.

The LocalDateTime attached to this property is unchanged by this call.
Returns:
a copy of the LocalDateTime with this field set to its minimum/**
         * Returns a new LocalDateTime with this field set to the minimum value
         * for this field.
         * <p>
         * The LocalDateTime attached to this property is unchanged by this call.
         *
         * @return a copy of the LocalDateTime with this field set to its minimum
         */
        public LocalDateTime withMinimumValue() {
            return setCopy(getMinimumValue());
        }
        
        //-----------------------------------------------------------------------
        
Rounds to the lowest whole unit of this field on a copy of this
LocalDateTime.

For example, rounding floor on the hourOfDay field of a LocalDateTime
where the time is 10:30 would result in new LocalDateTime with the
time of 10:00.
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Rounds to the lowest whole unit of this field on a copy of this
         * LocalDateTime.
         * <p>
         * For example, rounding floor on the hourOfDay field of a LocalDateTime
         * where the time is 10:30 would result in new LocalDateTime with the
         * time of 10:00.
         *
         * @return a copy of the LocalDateTime with the field value changed
         */
        public LocalDateTime roundFloorCopy() {
            return iInstant.withLocalMillis(iField.roundFloor(iInstant.getLocalMillis()));
        }
        
        
Rounds to the highest whole unit of this field on a copy of this
LocalDateTime.

For example, rounding floor on the hourOfDay field of a LocalDateTime
where the time is 10:30 would result in new LocalDateTime with the
time of 11:00.
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Rounds to the highest whole unit of this field on a copy of this
         * LocalDateTime.
         * <p>
         * For example, rounding floor on the hourOfDay field of a LocalDateTime
         * where the time is 10:30 would result in new LocalDateTime with the
         * time of 11:00.
         *
         * @return a copy of the LocalDateTime with the field value changed
         */
        public LocalDateTime roundCeilingCopy() {
            return iInstant.withLocalMillis(iField.roundCeiling(iInstant.getLocalMillis()));
        }
        
        
Rounds to the nearest whole unit of this field on a copy of this
LocalDateTime, favoring the floor if halfway.
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Rounds to the nearest whole unit of this field on a copy of this
         * LocalDateTime, favoring the floor if halfway.
         *
         * @return a copy of the LocalDateTime with the field value changed
         */
        public LocalDateTime roundHalfFloorCopy() {
            return iInstant.withLocalMillis(iField.roundHalfFloor(iInstant.getLocalMillis()));
        }
        
        
Rounds to the nearest whole unit of this field on a copy of this
LocalDateTime, favoring the ceiling if halfway.
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Rounds to the nearest whole unit of this field on a copy of this
         * LocalDateTime, favoring the ceiling if halfway.
         *
         * @return a copy of the LocalDateTime with the field value changed
         */
        public LocalDateTime roundHalfCeilingCopy() {
            return iInstant.withLocalMillis(iField.roundHalfCeiling(iInstant.getLocalMillis()));
        }
        
        
Rounds to the nearest whole unit of this field on a copy of this
LocalDateTime.  If halfway, the ceiling is favored over the floor
only if it makes this field's value even.
Returns:
a copy of the LocalDateTime with the field value changed/**
         * Rounds to the nearest whole unit of this field on a copy of this
         * LocalDateTime.  If halfway, the ceiling is favored over the floor
         * only if it makes this field's value even.
         *
         * @return a copy of the LocalDateTime with the field value changed
         */
        public LocalDateTime roundHalfEvenCopy() {
            return iInstant.withLocalMillis(iField.roundHalfEven(iInstant.getLocalMillis()));
        }
    }

}