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

import static java.time.LocalTime.SECONDS_PER_DAY;
import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH;
import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR;
import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH;
import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR;
import static java.time.temporal.ChronoField.DAY_OF_MONTH;
import static java.time.temporal.ChronoField.DAY_OF_YEAR;
import static java.time.temporal.ChronoField.EPOCH_DAY;
import static java.time.temporal.ChronoField.ERA;
import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
import static java.time.temporal.ChronoField.PROLEPTIC_MONTH;
import static java.time.temporal.ChronoField.YEAR;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.time.chrono.ChronoLocalDate;
import java.time.chrono.IsoEra;
import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalQuery;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
import java.time.zone.ZoneOffsetTransition;
import java.time.zone.ZoneRules;
import java.util.Objects;
import java.util.stream.LongStream;
import java.util.stream.Stream;


A date without a time-zone in the ISO-8601 calendar system, such as 2007-12-03. 
 LocalDate is an immutable date-time object that represents a date, often viewed as year-month-day. Other date fields, such as day-of-year, day-of-week and week-of-year, can also be accessed. For example, the value "2nd October 2007" can be stored in a LocalDate. 

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


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


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

    
The minimum supported LocalDate, '-999999999-01-01'. This could be used by an application as a "far past" date. 
/**
     * The minimum supported {@code LocalDate}, '-999999999-01-01'.
     * This could be used by an application as a "far past" date.
     */
    public static final LocalDate MIN = LocalDate.of(Year.MIN_VALUE, 1, 1);
    
The maximum supported LocalDate, '+999999999-12-31'. This could be used by an application as a "far future" date. 
/**
     * The maximum supported {@code LocalDate}, '+999999999-12-31'.
     * This could be used by an application as a "far future" date.
     */
    public static final LocalDate MAX = LocalDate.of(Year.MAX_VALUE, 12, 31);
    
The epoch year LocalDate, '1970-01-01'. 
/**
     * The epoch year {@code LocalDate}, '1970-01-01'.
     */
    public static final LocalDate EPOCH = LocalDate.of(1970, 1, 1);

    
Serialization version.

/**
     * Serialization version.
     */
    private static final long serialVersionUID = 2942565459149668126L;
    
The number of days in a 400 year cycle.

/**
     * The number of days in a 400 year cycle.
     */
    private static final int DAYS_PER_CYCLE = 146097;
    
The number of days from year zero to year 1970.
There are five 400 year cycles from year zero to 2000.
There are 7 leap years from 1970 to 2000.

/**
     * The number of days from year zero to year 1970.
     * There are five 400 year cycles from year zero to 2000.
     * There are 7 leap years from 1970 to 2000.
     */
    static final long DAYS_0000_TO_1970 = (DAYS_PER_CYCLE * 5L) - (30L * 365L + 7L);

    
The year.

/**
     * The year.
     */
    private final int year;
    
The month-of-year.

/**
     * The month-of-year.
     */
    private final short month;
    
The day-of-month.

/**
     * The day-of-month.
     */
    private final short day;

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

 This will query the system clock in the default time-zone to obtain the current date. 

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

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

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

 This will query the system clock to obtain the current date. Specifying the time-zone avoids dependence on the default time-zone. 

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

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

    
Obtains the current date from the specified clock.

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

    //-----------------------------------------------------------------------
    
Obtains an instance of LocalDate from a year, month and day. 
 This returns a LocalDate with the specified year, month and day-of-month. The day must be valid for the year and month, otherwise an exception will be thrown. 
Params:
  • year –  the year to represent, from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, not null
  • dayOfMonth –  the day-of-month to represent, from 1 to 31
Throws:
  • DateTimeException – if the value of any field is out of range,
 or if the day-of-month is invalid for the month-year
Returns:the local date, not null
/**
     * Obtains an instance of {@code LocalDate} from a year, month and day.
     * <p>
     * This returns a {@code LocalDate} with the specified year, month and day-of-month.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     *
     * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, not null
     * @param dayOfMonth  the day-of-month to represent, from 1 to 31
     * @return the local date, not null
     * @throws DateTimeException if the value of any field is out of range,
     *  or if the day-of-month is invalid for the month-year
     */
    public static LocalDate of(int year, Month month, int dayOfMonth) {
        YEAR.checkValidValue(year);
        Objects.requireNonNull(month, "month");
        DAY_OF_MONTH.checkValidValue(dayOfMonth);
        return create(year, month.getValue(), dayOfMonth);
    }

    
Obtains an instance of LocalDate from a year, month and day. 
 This returns a LocalDate with the specified year, month and day-of-month. The day must be valid for the year and month, otherwise an exception will be thrown. 
Params:
  • year –  the year to represent, from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, from 1 (January) to 12 (December)
  • dayOfMonth –  the day-of-month to represent, from 1 to 31
Throws:
  • DateTimeException – if the value of any field is out of range,
 or if the day-of-month is invalid for the month-year
Returns:the local date, not null
/**
     * Obtains an instance of {@code LocalDate} from a year, month and day.
     * <p>
     * This returns a {@code LocalDate} with the specified year, month and day-of-month.
     * The day must be valid for the year and month, otherwise an exception will be thrown.
     *
     * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, from 1 (January) to 12 (December)
     * @param dayOfMonth  the day-of-month to represent, from 1 to 31
     * @return the local date, not null
     * @throws DateTimeException if the value of any field is out of range,
     *  or if the day-of-month is invalid for the month-year
     */
    public static LocalDate of(int year, int month, int dayOfMonth) {
        YEAR.checkValidValue(year);
        MONTH_OF_YEAR.checkValidValue(month);
        DAY_OF_MONTH.checkValidValue(dayOfMonth);
        return create(year, month, dayOfMonth);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of LocalDate from a year and day-of-year. 
 This returns a LocalDate with the specified year and day-of-year. The day-of-year must be valid for the year, otherwise an exception will be thrown. 
Params:
  • year –  the year to represent, from MIN_YEAR to MAX_YEAR
  • dayOfYear –  the day-of-year to represent, from 1 to 366
Throws:
  • DateTimeException – if the value of any field is out of range,
 or if the day-of-year is invalid for the year
Returns:the local date, not null
/**
     * Obtains an instance of {@code LocalDate} from a year and day-of-year.
     * <p>
     * This returns a {@code LocalDate} with the specified year and day-of-year.
     * The day-of-year must be valid for the year, otherwise an exception will be thrown.
     *
     * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
     * @param dayOfYear  the day-of-year to represent, from 1 to 366
     * @return the local date, not null
     * @throws DateTimeException if the value of any field is out of range,
     *  or if the day-of-year is invalid for the year
     */
    public static LocalDate ofYearDay(int year, int dayOfYear) {
        YEAR.checkValidValue(year);
        DAY_OF_YEAR.checkValidValue(dayOfYear);
        boolean leap = IsoChronology.INSTANCE.isLeapYear(year);
        if (dayOfYear == 366 && leap == false) {
            throw new DateTimeException("Invalid date 'DayOfYear 366' as '" + year + "' is not a leap year");
        }
        Month moy = Month.of((dayOfYear - 1) / 31 + 1);
        int monthEnd = moy.firstDayOfYear(leap) + moy.length(leap) - 1;
        if (dayOfYear > monthEnd) {
            moy = moy.plus(1);
        }
        int dom = dayOfYear - moy.firstDayOfYear(leap) + 1;
        return new LocalDate(year, moy.getValue(), dom);
    }

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

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

Params:
  • instant –  the instant to create the date from, not null
  • zone –  the time-zone, which may be an offset, not null
Throws:
Returns:the local date, not null
Since:9
/**
     * Obtains an instance of {@code LocalDate} from an {@code Instant} and zone ID.
     * <p>
     * This creates a local date based on the specified instant.
     * First, the offset from UTC/Greenwich is obtained using the zone ID and instant,
     * which is simple as there is only one valid offset for each instant.
     * Then, the instant and offset are used to calculate the local date.
     *
     * @param instant  the instant to create the date from, not null
     * @param zone  the time-zone, which may be an offset, not null
     * @return the local date, not null
     * @throws DateTimeException if the result exceeds the supported range
     * @since 9
     */
    public static LocalDate ofInstant(Instant instant, ZoneId zone) {
        Objects.requireNonNull(instant, "instant");
        Objects.requireNonNull(zone, "zone");
        ZoneRules rules = zone.getRules();
        ZoneOffset offset = rules.getOffset(instant);
        long localSecond = instant.getEpochSecond() + offset.getTotalSeconds();
        long localEpochDay = Math.floorDiv(localSecond, SECONDS_PER_DAY);
        return ofEpochDay(localEpochDay);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of LocalDate from the epoch day count. 
 This returns a LocalDate with the specified epoch-day. The EPOCH_DAY is a simple incrementing count of days where day 0 is 1970-01-01. Negative numbers represent earlier days. 
Params:
  • epochDay –  the Epoch Day to convert, based on the epoch 1970-01-01
Throws:
Returns:the local date, not null
/**
     * Obtains an instance of {@code LocalDate} from the epoch day count.
     * <p>
     * This returns a {@code LocalDate} with the specified epoch-day.
     * The {@link ChronoField#EPOCH_DAY EPOCH_DAY} is a simple incrementing count
     * of days where day 0 is 1970-01-01. Negative numbers represent earlier days.
     *
     * @param epochDay  the Epoch Day to convert, based on the epoch 1970-01-01
     * @return the local date, not null
     * @throws DateTimeException if the epoch day exceeds the supported date range
     */
    public static LocalDate ofEpochDay(long epochDay) {
        EPOCH_DAY.checkValidValue(epochDay);
        long zeroDay = epochDay + DAYS_0000_TO_1970;
        // find the march-based year
        zeroDay -= 60;  // adjust to 0000-03-01 so leap day is at end of four year cycle
        long adjust = 0;
        if (zeroDay < 0) {
            // adjust negative years to positive for calculation
            long adjustCycles = (zeroDay + 1) / DAYS_PER_CYCLE - 1;
            adjust = adjustCycles * 400;
            zeroDay += -adjustCycles * DAYS_PER_CYCLE;
        }
        long yearEst = (400 * zeroDay + 591) / DAYS_PER_CYCLE;
        long doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400);
        if (doyEst < 0) {
            // fix estimate
            yearEst--;
            doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400);
        }
        yearEst += adjust;  // reset any negative year
        int marchDoy0 = (int) doyEst;

        // convert march-based values back to january-based
        int marchMonth0 = (marchDoy0 * 5 + 2) / 153;
        int month = (marchMonth0 + 2) % 12 + 1;
        int dom = marchDoy0 - (marchMonth0 * 306 + 5) / 10 + 1;
        yearEst += marchMonth0 / 10;

        // check year now we are certain it is correct
        int year = YEAR.checkValidIntValue(yearEst);
        return new LocalDate(year, month, dom);
    }

    //-----------------------------------------------------------------------
    
Obtains an instance of LocalDate from a temporal object. 
 This obtains a local date based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of LocalDate. 
 The conversion uses the TemporalQueries.localDate() query, which relies on extracting the EPOCH_DAY field. 
 This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, LocalDate::from. 
Params:
  • temporal –  the temporal object to convert, not null
Throws:
Returns:the local date, not null
/**
     * Obtains an instance of {@code LocalDate} from a temporal object.
     * <p>
     * This obtains a local date based on the specified temporal.
     * A {@code TemporalAccessor} represents an arbitrary set of date and time information,
     * which this factory converts to an instance of {@code LocalDate}.
     * <p>
     * The conversion uses the {@link TemporalQueries#localDate()} query, which relies
     * on extracting the {@link ChronoField#EPOCH_DAY EPOCH_DAY} field.
     * <p>
     * This method matches the signature of the functional interface {@link TemporalQuery}
     * allowing it to be used as a query via method reference, {@code LocalDate::from}.
     *
     * @param temporal  the temporal object to convert, not null
     * @return the local date, not null
     * @throws DateTimeException if unable to convert to a {@code LocalDate}
     */
    public static LocalDate from(TemporalAccessor temporal) {
        Objects.requireNonNull(temporal, "temporal");
        LocalDate date = temporal.query(TemporalQueries.localDate());
        if (date == null) {
            throw new DateTimeException("Unable to obtain LocalDate from TemporalAccessor: " +
                    temporal + " of type " + temporal.getClass().getName());
        }
        return date;
    }

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

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

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

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

    //-----------------------------------------------------------------------
    
Creates a local date from the year, month and day fields.

Params:
  • year –  the year to represent, validated from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, from 1 to 12, validated
  • dayOfMonth –  the day-of-month to represent, validated from 1 to 31
Throws:
Returns:the local date, not null
/**
     * Creates a local date from the year, month and day fields.
     *
     * @param year  the year to represent, validated from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, from 1 to 12, validated
     * @param dayOfMonth  the day-of-month to represent, validated from 1 to 31
     * @return the local date, not null
     * @throws DateTimeException if the day-of-month is invalid for the month-year
     */
    private static LocalDate create(int year, int month, int dayOfMonth) {
        if (dayOfMonth > 28) {
            int dom = 31;
            switch (month) {
                case 2:
                    dom = (IsoChronology.INSTANCE.isLeapYear(year) ? 29 : 28);
                    break;
                case 4:
                case 6:
                case 9:
                case 11:
                    dom = 30;
                    break;
            }
            if (dayOfMonth > dom) {
                if (dayOfMonth == 29) {
                    throw new DateTimeException("Invalid date 'February 29' as '" + year + "' is not a leap year");
                } else {
                    throw new DateTimeException("Invalid date '" + Month.of(month).name() + " " + dayOfMonth + "'");
                }
            }
        }
        return new LocalDate(year, month, dayOfMonth);
    }

    
Resolves the date, resolving days past the end of month.

Params:
  • year –  the year to represent, validated from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, validated from 1 to 12
  • day –  the day-of-month to represent, validated from 1 to 31
Returns:the resolved date, not null
/**
     * Resolves the date, resolving days past the end of month.
     *
     * @param year  the year to represent, validated from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, validated from 1 to 12
     * @param day  the day-of-month to represent, validated from 1 to 31
     * @return the resolved date, not null
     */
    private static LocalDate resolvePreviousValid(int year, int month, int day) {
        switch (month) {
            case 2:
                day = Math.min(day, IsoChronology.INSTANCE.isLeapYear(year) ? 29 : 28);
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                day = Math.min(day, 30);
                break;
        }
        return new LocalDate(year, month, day);
    }

    
Constructor, previously validated.

Params:
  • year –  the year to represent, from MIN_YEAR to MAX_YEAR
  • month –  the month-of-year to represent, not null
  • dayOfMonth –  the day-of-month to represent, valid for year-month, from 1 to 31
/**
     * Constructor, previously validated.
     *
     * @param year  the year to represent, from MIN_YEAR to MAX_YEAR
     * @param month  the month-of-year to represent, not null
     * @param dayOfMonth  the day-of-month to represent, valid for year-month, from 1 to 31
     */
    private LocalDate(int year, int month, int dayOfMonth) {
        this.year = year;
        this.month = (short) month;
        this.day = (short) dayOfMonth;
    }

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

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

  • DAY_OF_WEEK 
  • ALIGNED_DAY_OF_WEEK_IN_MONTH 
  • ALIGNED_DAY_OF_WEEK_IN_YEAR 
  • DAY_OF_MONTH 
  • DAY_OF_YEAR 
  • EPOCH_DAY 
  • ALIGNED_WEEK_OF_MONTH 
  • ALIGNED_WEEK_OF_YEAR 
  • MONTH_OF_YEAR 
  • PROLEPTIC_MONTH 
  • YEAR_OF_ERA 
  • YEAR 
  • ERA 
 All other ChronoField instances will return false. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.isSupportedBy(TemporalAccessor) passing this as the argument. Whether the field is supported is determined by the field. 
Params:
  • field –  the field to check, null returns false
Returns:true if the field is supported on this date, false if not
/**
     * Checks if the specified field is supported.
     * <p>
     * This checks if this date can be queried for the specified field.
     * If false, then calling the {@link #range(TemporalField) range},
     * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
     * methods will throw an exception.
     * <p>
     * If the field is a {@link ChronoField} then the query is implemented here.
     * The supported fields are:
     * <ul>
     * <li>{@code DAY_OF_WEEK}
     * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
     * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
     * <li>{@code DAY_OF_MONTH}
     * <li>{@code DAY_OF_YEAR}
     * <li>{@code EPOCH_DAY}
     * <li>{@code ALIGNED_WEEK_OF_MONTH}
     * <li>{@code ALIGNED_WEEK_OF_YEAR}
     * <li>{@code MONTH_OF_YEAR}
     * <li>{@code PROLEPTIC_MONTH}
     * <li>{@code YEAR_OF_ERA}
     * <li>{@code YEAR}
     * <li>{@code ERA}
     * </ul>
     * All other {@code ChronoField} instances will return false.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}
     * passing {@code this} as the argument.
     * Whether the field is supported is determined by the field.
     *
     * @param field  the field to check, null returns false
     * @return true if the field is supported on this date, false if not
     */
    @Override  // override for Javadoc
    public boolean isSupported(TemporalField field) {
        return ChronoLocalDate.super.isSupported(field);
    }

    
Checks if the specified unit is supported.

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

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

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


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

 If the field is a ChronoField then the query is implemented here. The supported fields will return appropriate range instances. All other ChronoField instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.rangeRefinedBy(TemporalAccessor) passing this as the argument. Whether the range can be obtained is determined by the field. 
Params:
  • field –  the field to query the range for, not null
Throws:
Returns:the range of valid values for the field, not null
/**
     * Gets the range of valid values for the specified field.
     * <p>
     * The range object expresses the minimum and maximum valid values for a field.
     * This date is used to enhance the accuracy of the returned range.
     * If it is not possible to return the range, because the field is not supported
     * or for some other reason, an exception is thrown.
     * <p>
     * If the field is a {@link ChronoField} then the query is implemented here.
     * The {@link #isSupported(TemporalField) supported fields} will return
     * appropriate range instances.
     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}
     * passing {@code this} as the argument.
     * Whether the range can be obtained is determined by the field.
     *
     * @param field  the field to query the range for, not null
     * @return the range of valid values for the field, not null
     * @throws DateTimeException if the range for the field cannot be obtained
     * @throws UnsupportedTemporalTypeException if the field is not supported
     */
    @Override
    public ValueRange range(TemporalField field) {
        if (field instanceof ChronoField) {
            ChronoField f = (ChronoField) field;
            if (f.isDateBased()) {
                switch (f) {
                    case DAY_OF_MONTH: return ValueRange.of(1, lengthOfMonth());
                    case DAY_OF_YEAR: return ValueRange.of(1, lengthOfYear());
                    case ALIGNED_WEEK_OF_MONTH: return ValueRange.of(1, getMonth() == Month.FEBRUARY && isLeapYear() == false ? 4 : 5);
                    case YEAR_OF_ERA:
                        return (getYear() <= 0 ? ValueRange.of(1, Year.MAX_VALUE + 1) : ValueRange.of(1, Year.MAX_VALUE));
                }
                return field.range();
            }
            throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
        }
        return field.rangeRefinedBy(this);
    }

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

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

 If the field is a ChronoField then the query is implemented here. The supported fields will return valid values based on this date, except EPOCH_DAY and PROLEPTIC_MONTH which are too large to fit in an int and throw an UnsupportedTemporalTypeException. All other ChronoField instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field. 
Params:
  • field –  the field to get, not null
Throws:
Returns:the value for the field
/**
     * Gets the value of the specified field from this date as an {@code int}.
     * <p>
     * This queries this date for the value of the specified field.
     * The returned value will always be within the valid range of values for the field.
     * If it is not possible to return the value, because the field is not supported
     * or for some other reason, an exception is thrown.
     * <p>
     * If the field is a {@link ChronoField} then the query is implemented here.
     * The {@link #isSupported(TemporalField) supported fields} will return valid
     * values based on this date, except {@code EPOCH_DAY} and {@code PROLEPTIC_MONTH}
     * which are too large to fit in an {@code int} and throw an {@code UnsupportedTemporalTypeException}.
     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
     * passing {@code this} as the argument. Whether the value can be obtained,
     * and what the value represents, is determined by the field.
     *
     * @param field  the field to get, not null
     * @return the value for the field
     * @throws DateTimeException if a value for the field cannot be obtained or
     *         the value is outside the range of valid values for the field
     * @throws UnsupportedTemporalTypeException if the field is not supported or
     *         the range of values exceeds an {@code int}
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override  // override for Javadoc and performance
    public int get(TemporalField field) {
        if (field instanceof ChronoField) {
            return get0(field);
        }
        return ChronoLocalDate.super.get(field);
    }

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

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

 If the field is a ChronoField then the query is implemented here. The supported fields will return valid values based on this date. All other ChronoField instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.getFrom(TemporalAccessor) passing this as the argument. Whether the value can be obtained, and what the value represents, is determined by the field. 
Params:
  • field –  the field to get, not null
Throws:
Returns:the value for the field
/**
     * Gets the value of the specified field from this date as a {@code long}.
     * <p>
     * This queries this date for the value of the specified field.
     * If it is not possible to return the value, because the field is not supported
     * or for some other reason, an exception is thrown.
     * <p>
     * If the field is a {@link ChronoField} then the query is implemented here.
     * The {@link #isSupported(TemporalField) supported fields} will return valid
     * values based on this date.
     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}
     * passing {@code this} as the argument. Whether the value can be obtained,
     * and what the value represents, is determined by the field.
     *
     * @param field  the field to get, not null
     * @return the value for the field
     * @throws DateTimeException if a value for the field cannot be obtained
     * @throws UnsupportedTemporalTypeException if the field is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public long getLong(TemporalField field) {
        if (field instanceof ChronoField) {
            if (field == EPOCH_DAY) {
                return toEpochDay();
            }
            if (field == PROLEPTIC_MONTH) {
                return getProlepticMonth();
            }
            return get0(field);
        }
        return field.getFrom(this);
    }

    private int get0(TemporalField field) {
        switch ((ChronoField) field) {
            case DAY_OF_WEEK: return getDayOfWeek().getValue();
            case ALIGNED_DAY_OF_WEEK_IN_MONTH: return ((day - 1) % 7) + 1;
            case ALIGNED_DAY_OF_WEEK_IN_YEAR: return ((getDayOfYear() - 1) % 7) + 1;
            case DAY_OF_MONTH: return day;
            case DAY_OF_YEAR: return getDayOfYear();
            case EPOCH_DAY: throw new UnsupportedTemporalTypeException("Invalid field 'EpochDay' for get() method, use getLong() instead");
            case ALIGNED_WEEK_OF_MONTH: return ((day - 1) / 7) + 1;
            case ALIGNED_WEEK_OF_YEAR: return ((getDayOfYear() - 1) / 7) + 1;
            case MONTH_OF_YEAR: return month;
            case PROLEPTIC_MONTH: throw new UnsupportedTemporalTypeException("Invalid field 'ProlepticMonth' for get() method, use getLong() instead");
            case YEAR_OF_ERA: return (year >= 1 ? year : 1 - year);
            case YEAR: return year;
            case ERA: return (year >= 1 ? 1 : 0);
        }
        throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
    }

    private long getProlepticMonth() {
        return (year * 12L + month - 1);
    }

    //-----------------------------------------------------------------------
    
Gets the chronology of this date, which is the ISO calendar system.

 The Chronology represents the calendar system in use. The ISO-8601 calendar system is the modern civil calendar system used today in most of the world. It is equivalent to the proleptic Gregorian calendar system, in which today's rules for leap years are applied for all time. 
Returns:the ISO chronology, not null
/**
     * Gets the chronology of this date, which is the ISO calendar system.
     * <p>
     * The {@code Chronology} represents the calendar system in use.
     * The ISO-8601 calendar system is the modern civil calendar system used today
     * in most of the world. It is equivalent to the proleptic Gregorian calendar
     * system, in which today's rules for leap years are applied for all time.
     *
     * @return the ISO chronology, not null
     */
    @Override
    public IsoChronology getChronology() {
        return IsoChronology.INSTANCE;
    }

    
Gets the era applicable at this date.

 The official ISO-8601 standard does not define eras, however IsoChronology does. It defines two eras, 'CE' from year one onwards and 'BCE' from year zero backwards. Since dates before the Julian-Gregorian cutover are not in line with history, the cutover between 'BCE' and 'CE' is also not aligned with the commonly used eras, often referred to using 'BC' and 'AD'. 
 Users of this class should typically ignore this method as it exists primarily to fulfill the ChronoLocalDate contract where it is necessary to support the Japanese calendar system. 
Returns:the IsoEra applicable at this date, not null
/**
     * Gets the era applicable at this date.
     * <p>
     * The official ISO-8601 standard does not define eras, however {@code IsoChronology} does.
     * It defines two eras, 'CE' from year one onwards and 'BCE' from year zero backwards.
     * Since dates before the Julian-Gregorian cutover are not in line with history,
     * the cutover between 'BCE' and 'CE' is also not aligned with the commonly used
     * eras, often referred to using 'BC' and 'AD'.
     * <p>
     * Users of this class should typically ignore this method as it exists primarily
     * to fulfill the {@link ChronoLocalDate} contract where it is necessary to support
     * the Japanese calendar system.
     *
     * @return the IsoEra applicable at this date, not null
     */
    @Override // override for Javadoc
    public IsoEra getEra() {
        return (getYear() >= 1 ? IsoEra.CE : IsoEra.BCE);
    }

    
Gets the year field.

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

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

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

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

    
Gets the day-of-month field.

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

    
Gets the day-of-year field.

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

    
Gets the day-of-week field, which is an enum DayOfWeek. 
 This method returns the enum DayOfWeek for the day-of-week. This avoids confusion as to what int values mean. If you need access to the primitive int value then the enum provides the int value. 
 Additional information can be obtained from the DayOfWeek. This includes textual names of the values. 
Returns:the day-of-week, not null
/**
     * Gets the day-of-week field, which is an enum {@code DayOfWeek}.
     * <p>
     * This method returns the enum {@link DayOfWeek} for the day-of-week.
     * This avoids confusion as to what {@code int} values mean.
     * If you need access to the primitive {@code int} value then the enum
     * provides the {@link DayOfWeek#getValue() int value}.
     * <p>
     * Additional information can be obtained from the {@code DayOfWeek}.
     * This includes textual names of the values.
     *
     * @return the day-of-week, not null
     */
    public DayOfWeek getDayOfWeek() {
        int dow0 = Math.floorMod(toEpochDay() + 3, 7);
        return DayOfWeek.of(dow0 + 1);
    }

    //-----------------------------------------------------------------------
    
Checks if the year is a leap year, according to the ISO proleptic
calendar system rules.


This method applies the current rules for leap years across the whole time-line.
In general, a year is a leap year if it is divisible by four without
remainder. However, years divisible by 100, are not leap years, with
the exception of years divisible by 400 which are.


For example, 1904 is a leap year it is divisible by 4.
1900 was not a leap year as it is divisible by 100, however 2000 was a
leap year as it is divisible by 400.


The calculation is proleptic - applying the same rules into the far future and far past.
This is historically inaccurate, but is correct for the ISO-8601 standard.

Returns:true if the year is leap, false otherwise
/**
     * Checks if the year is a leap year, according to the ISO proleptic
     * calendar system rules.
     * <p>
     * This method applies the current rules for leap years across the whole time-line.
     * In general, a year is a leap year if it is divisible by four without
     * remainder. However, years divisible by 100, are not leap years, with
     * the exception of years divisible by 400 which are.
     * <p>
     * For example, 1904 is a leap year it is divisible by 4.
     * 1900 was not a leap year as it is divisible by 100, however 2000 was a
     * leap year as it is divisible by 400.
     * <p>
     * The calculation is proleptic - applying the same rules into the far future and far past.
     * This is historically inaccurate, but is correct for the ISO-8601 standard.
     *
     * @return true if the year is leap, false otherwise
     */
    @Override // override for Javadoc and performance
    public boolean isLeapYear() {
        return IsoChronology.INSTANCE.isLeapYear(year);
    }

    
Returns the length of the month represented by this date.


This returns the length of the month in days.
For example, a date in January would return 31.

Returns:the length of the month in days
/**
     * Returns the length of the month represented by this date.
     * <p>
     * This returns the length of the month in days.
     * For example, a date in January would return 31.
     *
     * @return the length of the month in days
     */
    @Override
    public int lengthOfMonth() {
        switch (month) {
            case 2:
                return (isLeapYear() ? 29 : 28);
            case 4:
            case 6:
            case 9:
            case 11:
                return 30;
            default:
                return 31;
        }
    }

    
Returns the length of the year represented by this date.


This returns the length of the year in days, either 365 or 366.

Returns:366 if the year is leap, 365 otherwise
/**
     * Returns the length of the year represented by this date.
     * <p>
     * This returns the length of the year in days, either 365 or 366.
     *
     * @return 366 if the year is leap, 365 otherwise
     */
    @Override // override for Javadoc and performance
    public int lengthOfYear() {
        return (isLeapYear() ? 366 : 365);
    }

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

 This returns a LocalDate, based on this one, with the date adjusted. The adjustment takes place using the specified adjuster strategy object. Read the documentation of the adjuster to understand what adjustment will be made. 

A simple adjuster might simply set the one of the fields, such as the year field.
A more complex adjuster might set the date to the last day of the month.

 A selection of common adjustments is provided in TemporalAdjusters. These include finding the "last day of the month" and "next Wednesday". Key date-time classes also implement the TemporalAdjuster interface, such as Month and MonthDay. The adjuster is responsible for handling special cases, such as the varying lengths of month and leap years. 

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

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



 The result of this method is obtained by invoking the TemporalAdjuster.adjustInto(Temporal) method on the specified adjuster passing this as the argument. 

This instance is immutable and unaffected by this method call.

Params:
  • adjuster – the adjuster to use, not null
Throws:
Returns:a LocalDate based on this with the adjustment made, not null
/**
     * Returns an adjusted copy of this date.
     * <p>
     * This returns a {@code LocalDate}, based on this one, with the date adjusted.
     * The adjustment takes place using the specified adjuster strategy object.
     * Read the documentation of the adjuster to understand what adjustment will be made.
     * <p>
     * A simple adjuster might simply set the one of the fields, such as the year field.
     * A more complex adjuster might set the date to the last day of the month.
     * <p>
     * A selection of common adjustments is provided in
     * {@link java.time.temporal.TemporalAdjusters TemporalAdjusters}.
     * These include finding the "last day of the month" and "next Wednesday".
     * Key date-time classes also implement the {@code TemporalAdjuster} interface,
     * such as {@link Month} and {@link java.time.MonthDay MonthDay}.
     * The adjuster is responsible for handling special cases, such as the varying
     * lengths of month and leap years.
     * <p>
     * For example this code returns a date on the last day of July:
     * <pre>
     *  import static java.time.Month.*;
     *  import static java.time.temporal.TemporalAdjusters.*;
     *
     *  result = localDate.with(JULY).with(lastDayOfMonth());
     * </pre>
     * <p>
     * The result of this method is obtained by invoking the
     * {@link TemporalAdjuster#adjustInto(Temporal)} method on the
     * specified adjuster passing {@code this} as the argument.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param adjuster the adjuster to use, not null
     * @return a {@code LocalDate} based on {@code this} with the adjustment made, not null
     * @throws DateTimeException if the adjustment cannot be made
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public LocalDate with(TemporalAdjuster adjuster) {
        // optimizations
        if (adjuster instanceof LocalDate) {
            return (LocalDate) adjuster;
        }
        return (LocalDate) adjuster.adjustInto(this);
    }

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

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

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

 If the field is a ChronoField then the adjustment is implemented here. The supported fields behave as follows: 
    

  • DAY_OF_WEEK - Returns a LocalDate with the specified day-of-week. The date is adjusted up to 6 days forward or backward within the boundary of a Monday to Sunday week. 
  • ALIGNED_DAY_OF_WEEK_IN_MONTH - Returns a LocalDate with the specified aligned-day-of-week. The date is adjusted to the specified month-based aligned-day-of-week. Aligned weeks are counted such that the first week of a given month starts on the first day of that month. This may cause the date to be moved up to 6 days into the following month. 
  • ALIGNED_DAY_OF_WEEK_IN_YEAR - Returns a LocalDate with the specified aligned-day-of-week. The date is adjusted to the specified year-based aligned-day-of-week. Aligned weeks are counted such that the first week of a given year starts on the first day of that year. This may cause the date to be moved up to 6 days into the following year. 
  • DAY_OF_MONTH - Returns a LocalDate with the specified day-of-month. The month and year will be unchanged. If the day-of-month is invalid for the year and month, then a DateTimeException is thrown. 
  • DAY_OF_YEAR - Returns a LocalDate with the specified day-of-year. The year will be unchanged. If the day-of-year is invalid for the year, then a DateTimeException is thrown. 
  • EPOCH_DAY - Returns a LocalDate with the specified epoch-day. This completely replaces the date and is equivalent to ofEpochDay(long). 
  • ALIGNED_WEEK_OF_MONTH - Returns a LocalDate with the specified aligned-week-of-month. Aligned weeks are counted such that the first week of a given month starts on the first day of that month. This adjustment moves the date in whole week chunks to match the specified week. The result will have the same day-of-week as this date. This may cause the date to be moved into the following month. 
  • ALIGNED_WEEK_OF_YEAR - Returns a LocalDate with the specified aligned-week-of-year. Aligned weeks are counted such that the first week of a given year starts on the first day of that year. This adjustment moves the date in whole week chunks to match the specified week. The result will have the same day-of-week as this date. This may cause the date to be moved into the following year. 
  • MONTH_OF_YEAR - Returns a LocalDate with the specified month-of-year. The year will be unchanged. The day-of-month will also be unchanged, unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • PROLEPTIC_MONTH - Returns a LocalDate with the specified proleptic-month. The day-of-month will be unchanged, unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • YEAR_OF_ERA - Returns a LocalDate with the specified year-of-era. The era and month will be unchanged. The day-of-month will also be unchanged, unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • YEAR - Returns a LocalDate with the specified year. The month will be unchanged. The day-of-month will also be unchanged, unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • ERA - Returns a LocalDate with the specified era. The year-of-era and month will be unchanged. The day-of-month will also be unchanged, unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 


 In all cases, if the new value is outside the valid range of values for the field then a DateTimeException will be thrown. 
 All other ChronoField instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoField, then the result of this method is obtained by invoking TemporalField.adjustInto(Temporal, long) passing this as the argument. In this case, the field determines whether and how to adjust the instant. 

This instance is immutable and unaffected by this method call.

Params:
  • field –  the field to set in the result, not null
  • newValue –  the new value of the field in the result
Throws:
Returns:a LocalDate based on this with the specified field set, not null
/**
     * Returns a copy of this date with the specified field set to a new value.
     * <p>
     * This returns a {@code LocalDate}, based on this one, with the value
     * for the specified field changed.
     * This can be used to change any supported field, such as the year, month or day-of-month.
     * If it is not possible to set the value, because the field is not supported or for
     * some other reason, an exception is thrown.
     * <p>
     * In some cases, changing the specified field can cause the resulting date to become invalid,
     * such as changing the month from 31st January to February would make the day-of-month invalid.
     * In cases like this, the field is responsible for resolving the date. Typically it will choose
     * the previous valid date, which would be the last valid day of February in this example.
     * <p>
     * If the field is a {@link ChronoField} then the adjustment is implemented here.
     * The supported fields behave as follows:
     * <ul>
     * <li>{@code DAY_OF_WEEK} -
     *  Returns a {@code LocalDate} with the specified day-of-week.
     *  The date is adjusted up to 6 days forward or backward within the boundary
     *  of a Monday to Sunday week.
     * <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH} -
     *  Returns a {@code LocalDate} with the specified aligned-day-of-week.
     *  The date is adjusted to the specified month-based aligned-day-of-week.
     *  Aligned weeks are counted such that the first week of a given month starts
     *  on the first day of that month.
     *  This may cause the date to be moved up to 6 days into the following month.
     * <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR} -
     *  Returns a {@code LocalDate} with the specified aligned-day-of-week.
     *  The date is adjusted to the specified year-based aligned-day-of-week.
     *  Aligned weeks are counted such that the first week of a given year starts
     *  on the first day of that year.
     *  This may cause the date to be moved up to 6 days into the following year.
     * <li>{@code DAY_OF_MONTH} -
     *  Returns a {@code LocalDate} with the specified day-of-month.
     *  The month and year will be unchanged. If the day-of-month is invalid for the
     *  year and month, then a {@code DateTimeException} is thrown.
     * <li>{@code DAY_OF_YEAR} -
     *  Returns a {@code LocalDate} with the specified day-of-year.
     *  The year will be unchanged. If the day-of-year is invalid for the
     *  year, then a {@code DateTimeException} is thrown.
     * <li>{@code EPOCH_DAY} -
     *  Returns a {@code LocalDate} with the specified epoch-day.
     *  This completely replaces the date and is equivalent to {@link #ofEpochDay(long)}.
     * <li>{@code ALIGNED_WEEK_OF_MONTH} -
     *  Returns a {@code LocalDate} with the specified aligned-week-of-month.
     *  Aligned weeks are counted such that the first week of a given month starts
     *  on the first day of that month.
     *  This adjustment moves the date in whole week chunks to match the specified week.
     *  The result will have the same day-of-week as this date.
     *  This may cause the date to be moved into the following month.
     * <li>{@code ALIGNED_WEEK_OF_YEAR} -
     *  Returns a {@code LocalDate} with the specified aligned-week-of-year.
     *  Aligned weeks are counted such that the first week of a given year starts
     *  on the first day of that year.
     *  This adjustment moves the date in whole week chunks to match the specified week.
     *  The result will have the same day-of-week as this date.
     *  This may cause the date to be moved into the following year.
     * <li>{@code MONTH_OF_YEAR} -
     *  Returns a {@code LocalDate} with the specified month-of-year.
     *  The year will be unchanged. The day-of-month will also be unchanged,
     *  unless it would be invalid for the new month and year. In that case, the
     *  day-of-month is adjusted to the maximum valid value for the new month and year.
     * <li>{@code PROLEPTIC_MONTH} -
     *  Returns a {@code LocalDate} with the specified proleptic-month.
     *  The day-of-month will be unchanged, unless it would be invalid for the new month
     *  and year. In that case, the day-of-month is adjusted to the maximum valid value
     *  for the new month and year.
     * <li>{@code YEAR_OF_ERA} -
     *  Returns a {@code LocalDate} with the specified year-of-era.
     *  The era and month will be unchanged. The day-of-month will also be unchanged,
     *  unless it would be invalid for the new month and year. In that case, the
     *  day-of-month is adjusted to the maximum valid value for the new month and year.
     * <li>{@code YEAR} -
     *  Returns a {@code LocalDate} with the specified year.
     *  The month will be unchanged. The day-of-month will also be unchanged,
     *  unless it would be invalid for the new month and year. In that case, the
     *  day-of-month is adjusted to the maximum valid value for the new month and year.
     * <li>{@code ERA} -
     *  Returns a {@code LocalDate} with the specified era.
     *  The year-of-era and month will be unchanged. The day-of-month will also be unchanged,
     *  unless it would be invalid for the new month and year. In that case, the
     *  day-of-month is adjusted to the maximum valid value for the new month and year.
     * </ul>
     * <p>
     * In all cases, if the new value is outside the valid range of values for the field
     * then a {@code DateTimeException} will be thrown.
     * <p>
     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoField}, then the result of this method
     * is obtained by invoking {@code TemporalField.adjustInto(Temporal, long)}
     * passing {@code this} as the argument. In this case, the field determines
     * whether and how to adjust the instant.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param field  the field to set in the result, not null
     * @param newValue  the new value of the field in the result
     * @return a {@code LocalDate} based on {@code this} with the specified field set, not null
     * @throws DateTimeException if the field cannot be set
     * @throws UnsupportedTemporalTypeException if the field is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public LocalDate with(TemporalField field, long newValue) {
        if (field instanceof ChronoField) {
            ChronoField f = (ChronoField) field;
            f.checkValidValue(newValue);
            switch (f) {
                case DAY_OF_WEEK: return plusDays(newValue - getDayOfWeek().getValue());
                case ALIGNED_DAY_OF_WEEK_IN_MONTH: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_MONTH));
                case ALIGNED_DAY_OF_WEEK_IN_YEAR: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_YEAR));
                case DAY_OF_MONTH: return withDayOfMonth((int) newValue);
                case DAY_OF_YEAR: return withDayOfYear((int) newValue);
                case EPOCH_DAY: return LocalDate.ofEpochDay(newValue);
                case ALIGNED_WEEK_OF_MONTH: return plusWeeks(newValue - getLong(ALIGNED_WEEK_OF_MONTH));
                case ALIGNED_WEEK_OF_YEAR: return plusWeeks(newValue - getLong(ALIGNED_WEEK_OF_YEAR));
                case MONTH_OF_YEAR: return withMonth((int) newValue);
                case PROLEPTIC_MONTH: return plusMonths(newValue - getProlepticMonth());
                case YEAR_OF_ERA: return withYear((int) (year >= 1 ? newValue : 1 - newValue));
                case YEAR: return withYear((int) newValue);
                case ERA: return (getLong(ERA) == newValue ? this : withYear(1 - year));
            }
            throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
        }
        return field.adjustInto(this, newValue);
    }

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

If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.


This instance is immutable and unaffected by this method call.

Params:
  • year –  the year to set in the result, from MIN_YEAR to MAX_YEAR
Throws:
Returns:a LocalDate based on this date with the requested year, not null
/**
     * Returns a copy of this {@code LocalDate} with the year altered.
     * <p>
     * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param year  the year to set in the result, from MIN_YEAR to MAX_YEAR
     * @return a {@code LocalDate} based on this date with the requested year, not null
     * @throws DateTimeException if the year value is invalid
     */
    public LocalDate withYear(int year) {
        if (this.year == year) {
            return this;
        }
        YEAR.checkValidValue(year);
        return resolvePreviousValid(year, month, day);
    }

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

If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.


This instance is immutable and unaffected by this method call.

Params:
  • month –  the month-of-year to set in the result, from 1 (January) to 12 (December)
Throws:
Returns:a LocalDate based on this date with the requested month, not null
/**
     * Returns a copy of this {@code LocalDate} with the month-of-year altered.
     * <p>
     * If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param month  the month-of-year to set in the result, from 1 (January) to 12 (December)
     * @return a {@code LocalDate} based on this date with the requested month, not null
     * @throws DateTimeException if the month-of-year value is invalid
     */
    public LocalDate withMonth(int month) {
        if (this.month == month) {
            return this;
        }
        MONTH_OF_YEAR.checkValidValue(month);
        return resolvePreviousValid(year, month, day);
    }

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

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


This instance is immutable and unaffected by this method call.

Params:
  • dayOfMonth –  the day-of-month to set in the result, from 1 to 28-31
Throws:
  • DateTimeException – if the day-of-month value is invalid,
 or if the day-of-month is invalid for the month-year
Returns:a LocalDate based on this date with the requested day, not null
/**
     * Returns a copy of this {@code LocalDate} with the day-of-month altered.
     * <p>
     * If the resulting date is invalid, an exception is thrown.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param dayOfMonth  the day-of-month to set in the result, from 1 to 28-31
     * @return a {@code LocalDate} based on this date with the requested day, not null
     * @throws DateTimeException if the day-of-month value is invalid,
     *  or if the day-of-month is invalid for the month-year
     */
    public LocalDate withDayOfMonth(int dayOfMonth) {
        if (this.day == dayOfMonth) {
            return this;
        }
        return of(year, month, dayOfMonth);
    }

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

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


This instance is immutable and unaffected by this method call.

Params:
  • dayOfYear –  the day-of-year to set in the result, from 1 to 365-366
Throws:
  • DateTimeException – if the day-of-year value is invalid,
 or if the day-of-year is invalid for the year
Returns:a LocalDate based on this date with the requested day, not null
/**
     * Returns a copy of this {@code LocalDate} with the day-of-year altered.
     * <p>
     * If the resulting date is invalid, an exception is thrown.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param dayOfYear  the day-of-year to set in the result, from 1 to 365-366
     * @return a {@code LocalDate} based on this date with the requested day, not null
     * @throws DateTimeException if the day-of-year value is invalid,
     *  or if the day-of-year is invalid for the year
     */
    public LocalDate withDayOfYear(int dayOfYear) {
        if (this.getDayOfYear() == dayOfYear) {
            return this;
        }
        return ofYearDay(year, dayOfYear);
    }

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

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

This instance is immutable and unaffected by this method call.

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

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

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

In some cases, adding the amount can cause the resulting date to become invalid.
For example, adding one month to 31st January would result in 31st February.
In cases like this, the unit is responsible for resolving the date.
Typically it will choose the previous valid date, which would be the last valid
day of February in this example.

 If the field is a ChronoUnit then the addition is implemented here. The supported fields behave as follows: 
    

  • DAYS - Returns a LocalDate with the specified number of days added. This is equivalent to plusDays(long). 
  • WEEKS - Returns a LocalDate with the specified number of weeks added. This is equivalent to plusWeeks(long) and uses a 7 day week. 
  • MONTHS - Returns a LocalDate with the specified number of months added. This is equivalent to plusMonths(long). The day-of-month will be unchanged unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • YEARS - Returns a LocalDate with the specified number of years added. This is equivalent to plusYears(long). The day-of-month will be unchanged unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • DECADES - Returns a LocalDate with the specified number of decades added. This is equivalent to calling plusYears(long) with the amount multiplied by 10. The day-of-month will be unchanged unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • CENTURIES - Returns a LocalDate with the specified number of centuries added. This is equivalent to calling plusYears(long) with the amount multiplied by 100. The day-of-month will be unchanged unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • MILLENNIA - Returns a LocalDate with the specified number of millennia added. This is equivalent to calling plusYears(long) with the amount multiplied by 1,000. The day-of-month will be unchanged unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 
  • ERAS - Returns a LocalDate with the specified number of eras added. Only two eras are supported so the amount must be one, zero or minus one. If the amount is non-zero then the year is changed such that the year-of-era is unchanged. The day-of-month will be unchanged unless it would be invalid for the new month and year. In that case, the day-of-month is adjusted to the maximum valid value for the new month and year. 


 All other ChronoUnit instances will throw an UnsupportedTemporalTypeException. 
 If the field is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.addTo(Temporal, long) passing this as the argument. In this case, the unit determines whether and how to perform the addition. 

This instance is immutable and unaffected by this method call.

Params:
  • amountToAdd –  the amount of the unit to add to the result, may be negative
  • unit –  the unit of the amount to add, not null
Throws:
Returns:a LocalDate based on this date with the specified amount added, not null
/**
     * Returns a copy of this date with the specified amount added.
     * <p>
     * This returns a {@code LocalDate}, based on this one, with the amount
     * in terms of the unit added. If it is not possible to add the amount, because the
     * unit is not supported or for some other reason, an exception is thrown.
     * <p>
     * In some cases, adding the amount can cause the resulting date to become invalid.
     * For example, adding one month to 31st January would result in 31st February.
     * In cases like this, the unit is responsible for resolving the date.
     * Typically it will choose the previous valid date, which would be the last valid
     * day of February in this example.
     * <p>
     * If the field is a {@link ChronoUnit} then the addition is implemented here.
     * The supported fields behave as follows:
     * <ul>
     * <li>{@code DAYS} -
     *  Returns a {@code LocalDate} with the specified number of days added.
     *  This is equivalent to {@link #plusDays(long)}.
     * <li>{@code WEEKS} -
     *  Returns a {@code LocalDate} with the specified number of weeks added.
     *  This is equivalent to {@link #plusWeeks(long)} and uses a 7 day week.
     * <li>{@code MONTHS} -
     *  Returns a {@code LocalDate} with the specified number of months added.
     *  This is equivalent to {@link #plusMonths(long)}.
     *  The day-of-month will be unchanged unless it would be invalid for the new
     *  month and year. In that case, the day-of-month is adjusted to the maximum
     *  valid value for the new month and year.
     * <li>{@code YEARS} -
     *  Returns a {@code LocalDate} with the specified number of years added.
     *  This is equivalent to {@link #plusYears(long)}.
     *  The day-of-month will be unchanged unless it would be invalid for the new
     *  month and year. In that case, the day-of-month is adjusted to the maximum
     *  valid value for the new month and year.
     * <li>{@code DECADES} -
     *  Returns a {@code LocalDate} with the specified number of decades added.
     *  This is equivalent to calling {@link #plusYears(long)} with the amount
     *  multiplied by 10.
     *  The day-of-month will be unchanged unless it would be invalid for the new
     *  month and year. In that case, the day-of-month is adjusted to the maximum
     *  valid value for the new month and year.
     * <li>{@code CENTURIES} -
     *  Returns a {@code LocalDate} with the specified number of centuries added.
     *  This is equivalent to calling {@link #plusYears(long)} with the amount
     *  multiplied by 100.
     *  The day-of-month will be unchanged unless it would be invalid for the new
     *  month and year. In that case, the day-of-month is adjusted to the maximum
     *  valid value for the new month and year.
     * <li>{@code MILLENNIA} -
     *  Returns a {@code LocalDate} with the specified number of millennia added.
     *  This is equivalent to calling {@link #plusYears(long)} with the amount
     *  multiplied by 1,000.
     *  The day-of-month will be unchanged unless it would be invalid for the new
     *  month and year. In that case, the day-of-month is adjusted to the maximum
     *  valid value for the new month and year.
     * <li>{@code ERAS} -
     *  Returns a {@code LocalDate} with the specified number of eras added.
     *  Only two eras are supported so the amount must be one, zero or minus one.
     *  If the amount is non-zero then the year is changed such that the year-of-era
     *  is unchanged.
     *  The day-of-month will be unchanged unless it would be invalid for the new
     *  month and year. In that case, the day-of-month is adjusted to the maximum
     *  valid value for the new month and year.
     * </ul>
     * <p>
     * All other {@code ChronoUnit} instances will throw an {@code UnsupportedTemporalTypeException}.
     * <p>
     * If the field is not a {@code ChronoUnit}, then the result of this method
     * is obtained by invoking {@code TemporalUnit.addTo(Temporal, long)}
     * passing {@code this} as the argument. In this case, the unit determines
     * whether and how to perform the addition.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param amountToAdd  the amount of the unit to add to the result, may be negative
     * @param unit  the unit of the amount to add, not null
     * @return a {@code LocalDate} based on this date with the specified amount added, not null
     * @throws DateTimeException if the addition cannot be made
     * @throws UnsupportedTemporalTypeException if the unit is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public LocalDate plus(long amountToAdd, TemporalUnit unit) {
        if (unit instanceof ChronoUnit) {
            ChronoUnit f = (ChronoUnit) unit;
            switch (f) {
                case DAYS: return plusDays(amountToAdd);
                case WEEKS: return plusWeeks(amountToAdd);
                case MONTHS: return plusMonths(amountToAdd);
                case YEARS: return plusYears(amountToAdd);
                case DECADES: return plusYears(Math.multiplyExact(amountToAdd, 10));
                case CENTURIES: return plusYears(Math.multiplyExact(amountToAdd, 100));
                case MILLENNIA: return plusYears(Math.multiplyExact(amountToAdd, 1000));
                case ERAS: return with(ERA, Math.addExact(getLong(ERA), amountToAdd));
            }
            throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
        }
        return unit.addTo(this, amountToAdd);
    }

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

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

    

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

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

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




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


This instance is immutable and unaffected by this method call.

Params:
  • yearsToAdd –  the years to add, may be negative
Throws:
Returns:a LocalDate based on this date with the years added, not null
/**
     * Returns a copy of this {@code LocalDate} with the specified number of years added.
     * <p>
     * This method adds the specified amount to the years field in three steps:
     * <ol>
     * <li>Add the input years to the year field</li>
     * <li>Check if the resulting date would be invalid</li>
     * <li>Adjust the day-of-month to the last valid day if necessary</li>
     * </ol>
     * <p>
     * For example, 2008-02-29 (leap year) plus one year would result in the
     * invalid date 2009-02-29 (standard year). Instead of returning an invalid
     * result, the last valid day of the month, 2009-02-28, is selected instead.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param yearsToAdd  the years to add, may be negative
     * @return a {@code LocalDate} based on this date with the years added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDate plusYears(long yearsToAdd) {
        if (yearsToAdd == 0) {
            return this;
        }
        int newYear = YEAR.checkValidIntValue(year + yearsToAdd);  // safe overflow
        return resolvePreviousValid(newYear, month, day);
    }

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

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

    

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

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

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




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


This instance is immutable and unaffected by this method call.

Params:
  • monthsToAdd –  the months to add, may be negative
Throws:
Returns:a LocalDate based on this date with the months added, not null
/**
     * Returns a copy of this {@code LocalDate} with the specified number of months added.
     * <p>
     * This method adds the specified amount to the months field in three steps:
     * <ol>
     * <li>Add the input months to the month-of-year field</li>
     * <li>Check if the resulting date would be invalid</li>
     * <li>Adjust the day-of-month to the last valid day if necessary</li>
     * </ol>
     * <p>
     * For example, 2007-03-31 plus one month would result in the invalid date
     * 2007-04-31. Instead of returning an invalid result, the last valid day
     * of the month, 2007-04-30, is selected instead.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param monthsToAdd  the months to add, may be negative
     * @return a {@code LocalDate} based on this date with the months added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDate plusMonths(long monthsToAdd) {
        if (monthsToAdd == 0) {
            return this;
        }
        long monthCount = year * 12L + (month - 1);
        long calcMonths = monthCount + monthsToAdd;  // safe overflow
        int newYear = YEAR.checkValidIntValue(Math.floorDiv(calcMonths, 12));
        int newMonth = Math.floorMod(calcMonths, 12) + 1;
        return resolvePreviousValid(newYear, newMonth, day);
    }

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

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


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


This instance is immutable and unaffected by this method call.

Params:
  • weeksToAdd –  the weeks to add, may be negative
Throws:
Returns:a LocalDate based on this date with the weeks added, not null
/**
     * Returns a copy of this {@code LocalDate} with the specified number of weeks added.
     * <p>
     * This method adds the specified amount in weeks to the days field incrementing
     * the month and year fields as necessary to ensure the result remains valid.
     * The result is only invalid if the maximum/minimum year is exceeded.
     * <p>
     * For example, 2008-12-31 plus one week would result in 2009-01-07.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param weeksToAdd  the weeks to add, may be negative
     * @return a {@code LocalDate} based on this date with the weeks added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDate plusWeeks(long weeksToAdd) {
        return plusDays(Math.multiplyExact(weeksToAdd, 7));
    }

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

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


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


This instance is immutable and unaffected by this method call.

Params:
  • daysToAdd –  the days to add, may be negative
Throws:
Returns:a LocalDate based on this date with the days added, not null
/**
     * Returns a copy of this {@code LocalDate} with the specified number of days added.
     * <p>
     * This method adds the specified amount to the days field incrementing the
     * month and year fields as necessary to ensure the result remains valid.
     * The result is only invalid if the maximum/minimum year is exceeded.
     * <p>
     * For example, 2008-12-31 plus one day would result in 2009-01-01.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param daysToAdd  the days to add, may be negative
     * @return a {@code LocalDate} based on this date with the days added, not null
     * @throws DateTimeException if the result exceeds the supported date range
     */
    public LocalDate plusDays(long daysToAdd) {
        if (daysToAdd == 0) {
            return this;
        }
        long dom = day + daysToAdd;
        if (dom > 0) {
            if (dom <= 28) {
                return new LocalDate(year, month, (int) dom);
            } else if (dom <= 59) { // 59th Jan is 28th Feb, 59th Feb is 31st Mar
                long monthLen = lengthOfMonth();
                if (dom <= monthLen) {
                    return new LocalDate(year, month, (int) dom);
                } else if (month < 12) {
                    return new LocalDate(year, month + 1, (int) (dom - monthLen));
                } else {
                    YEAR.checkValidValue(year + 1);
                    return new LocalDate(year + 1, 1, (int) (dom - monthLen));
                }
            }
        }

        long mjDay = Math.addExact(toEpochDay(), daysToAdd);
        return LocalDate.ofEpochDay(mjDay);
    }

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

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

This instance is immutable and unaffected by this method call.

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

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

 This returns a LocalDate, based on this one, with the amount in terms of the unit subtracted. If it is not possible to subtract the amount, because the unit is not supported or for some other reason, an exception is thrown. 
 This method is equivalent to plus(long, TemporalUnit) with the amount negated. See that method for a full description of how addition, and thus subtraction, works. 

This instance is immutable and unaffected by this method call.

Params:
  • amountToSubtract –  the amount of the unit to subtract from the result, may be negative
  • unit –  the unit of the amount to subtract, not null
Throws:
Returns:a LocalDate based on this date with the specified amount subtracted, not null
/**
     * Returns a copy of this date with the specified amount subtracted.
     * <p>
     * This returns a {@code LocalDate}, based on this one, with the amount
     * in terms of the unit subtracted. If it is not possible to subtract the amount,
     * because the unit is not supported or for some other reason, an exception is thrown.
     * <p>
     * This method is equivalent to {@link #plus(long, TemporalUnit)} with the amount negated.
     * See that method for a full description of how addition, and thus subtraction, works.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param amountToSubtract  the amount of the unit to subtract from the result, may be negative
     * @param unit  the unit of the amount to subtract, not null
     * @return a {@code LocalDate} based on this date with the specified amount subtracted, not null
     * @throws DateTimeException if the subtraction cannot be made
     * @throws UnsupportedTemporalTypeException if the unit is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public LocalDate minus(long amountToSubtract, TemporalUnit unit) {
        return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
    }

    //-----------------------------------------------------------------------
    
Returns a copy of this LocalDate with the specified number of years subtracted. 

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

    

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

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

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




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


This instance is immutable and unaffected by this method call.

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

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

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

    

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

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

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




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


This instance is immutable and unaffected by this method call.

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

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

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


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


This instance is immutable and unaffected by this method call.

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

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

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


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


This instance is immutable and unaffected by this method call.

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

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

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

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


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

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




This instance is immutable and unaffected by this method call.

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

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

 This calculates the amount of time between two LocalDate objects in terms of a single TemporalUnit. The start and end points are this and the specified date. The result will be negative if the end is before the start. The Temporal passed to this method is converted to a LocalDate using from(TemporalAccessor). For example, the amount in days between two dates can be calculated using startDate.until(endDate, DAYS). 

The calculation returns a whole number, representing the number of
complete units between the two dates.
For example, the amount in months between 2012-06-15 and 2012-08-14
will only be one month as it is one day short of two months.

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


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

 The calculation is implemented in this method for ChronoUnit. The units DAYS, WEEKS, MONTHS, YEARS, DECADES, CENTURIES, MILLENNIA and ERAS are supported. Other ChronoUnit values will throw an exception. 
 If the unit is not a ChronoUnit, then the result of this method is obtained by invoking TemporalUnit.between(Temporal, Temporal) passing this as the first argument and the converted input temporal as the second argument. 

This instance is immutable and unaffected by this method call.

Params:
  • endExclusive –  the end date, exclusive, which is converted to a LocalDate, not null
  • unit –  the unit to measure the amount in, not null
Throws:
Returns:the amount of time between this date and the end date
/**
     * Calculates the amount of time until another date in terms of the specified unit.
     * <p>
     * This calculates the amount of time between two {@code LocalDate}
     * objects in terms of a single {@code TemporalUnit}.
     * The start and end points are {@code this} and the specified date.
     * The result will be negative if the end is before the start.
     * The {@code Temporal} passed to this method is converted to a
     * {@code LocalDate} using {@link #from(TemporalAccessor)}.
     * For example, the amount in days between two dates can be calculated
     * using {@code startDate.until(endDate, DAYS)}.
     * <p>
     * The calculation returns a whole number, representing the number of
     * complete units between the two dates.
     * For example, the amount in months between 2012-06-15 and 2012-08-14
     * will only be one month as it is one day short of two months.
     * <p>
     * There are two equivalent ways of using this method.
     * The first is to invoke this method.
     * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
     * <pre>
     *   // these two lines are equivalent
     *   amount = start.until(end, MONTHS);
     *   amount = MONTHS.between(start, end);
     * </pre>
     * The choice should be made based on which makes the code more readable.
     * <p>
     * The calculation is implemented in this method for {@link ChronoUnit}.
     * The units {@code DAYS}, {@code WEEKS}, {@code MONTHS}, {@code YEARS},
     * {@code DECADES}, {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS}
     * are supported. Other {@code ChronoUnit} values will throw an exception.
     * <p>
     * If the unit is not a {@code ChronoUnit}, then the result of this method
     * is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
     * passing {@code this} as the first argument and the converted input temporal
     * as the second argument.
     * <p>
     * This instance is immutable and unaffected by this method call.
     *
     * @param endExclusive  the end date, exclusive, which is converted to a {@code LocalDate}, not null
     * @param unit  the unit to measure the amount in, not null
     * @return the amount of time between this date and the end date
     * @throws DateTimeException if the amount cannot be calculated, or the end
     *  temporal cannot be converted to a {@code LocalDate}
     * @throws UnsupportedTemporalTypeException if the unit is not supported
     * @throws ArithmeticException if numeric overflow occurs
     */
    @Override
    public long until(Temporal endExclusive, TemporalUnit unit) {
        LocalDate end = LocalDate.from(endExclusive);
        if (unit instanceof ChronoUnit) {
            switch ((ChronoUnit) unit) {
                case DAYS: return daysUntil(end);
                case WEEKS: return daysUntil(end) / 7;
                case MONTHS: return monthsUntil(end);
                case YEARS: return monthsUntil(end) / 12;
                case DECADES: return monthsUntil(end) / 120;
                case CENTURIES: return monthsUntil(end) / 1200;
                case MILLENNIA: return monthsUntil(end) / 12000;
                case ERAS: return end.getLong(ERA) - getLong(ERA);
            }
            throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
        }
        return unit.between(this, end);
    }

    long daysUntil(LocalDate end) {
        return end.toEpochDay() - toEpochDay();  // no overflow
    }

    private long monthsUntil(LocalDate end) {
        long packed1 = getProlepticMonth() * 32L + getDayOfMonth();  // no overflow
        long packed2 = end.getProlepticMonth() * 32L + end.getDayOfMonth();  // no overflow
        return (packed2 - packed1) / 32;
    }

    
Calculates the period between this date and another date as a Period. 
 This calculates the period between two dates in terms of years, months and days. The start and end points are this and the specified date. The result will be negative if the end is before the start. The negative sign will be the same in each of year, month and day. 

The calculation is performed using the ISO calendar system.
If necessary, the input date will be converted to ISO.

 The start date is included, but the end date is not. The period is calculated by removing complete months, then calculating the remaining number of days, adjusting to ensure that both have the same sign. The number of months is then normalized into years and months based on a 12 month year. A month is considered to be complete if the end day-of-month is greater than or equal to the start day-of-month. For example, from 2010-01-15 to 2011-03-18 is "1 year, 2 months and 3 days". 
 There are two equivalent ways of using this method. The first is to invoke this method. The second is to use Period.between(LocalDate, LocalDate): 
  // these two lines are equivalent
  period = start.until(end);
  period = Period.between(start, end);


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

Params:
  • endDateExclusive –  the end date, exclusive, which may be in any chronology, not null
Returns:the period between this date and the end date, not null
/**
     * Calculates the period between this date and another date as a {@code Period}.
     * <p>
     * This calculates the period between two dates in terms of years, months and days.
     * The start and end points are {@code this} and the specified date.
     * The result will be negative if the end is before the start.
     * The negative sign will be the same in each of year, month and day.
     * <p>
     * The calculation is performed using the ISO calendar system.
     * If necessary, the input date will be converted to ISO.
     * <p>
     * The start date is included, but the end date is not.
     * The period is calculated by removing complete months, then calculating
     * the remaining number of days, adjusting to ensure that both have the same sign.
     * The number of months is then normalized into years and months based on a 12 month year.
     * A month is considered to be complete if the end day-of-month is greater
     * than or equal to the start day-of-month.
     * For example, from {@code 2010-01-15} to {@code 2011-03-18} is "1 year, 2 months and 3 days".
     * <p>
     * There are two equivalent ways of using this method.
     * The first is to invoke this method.
     * The second is to use {@link Period#between(LocalDate, LocalDate)}:
     * <pre>
     *   // these two lines are equivalent
     *   period = start.until(end);
     *   period = Period.between(start, end);
     * </pre>
     * The choice should be made based on which makes the code more readable.
     *
     * @param endDateExclusive  the end date, exclusive, which may be in any chronology, not null
     * @return the period between this date and the end date, not null
     */
    @Override
    public Period until(ChronoLocalDate endDateExclusive) {
        LocalDate end = LocalDate.from(endDateExclusive);
        long totalMonths = end.getProlepticMonth() - this.getProlepticMonth();  // safe
        int days = end.day - this.day;
        if (totalMonths > 0 && days < 0) {
            totalMonths--;
            LocalDate calcDate = this.plusMonths(totalMonths);
            days = (int) (end.toEpochDay() - calcDate.toEpochDay());  // safe
        } else if (totalMonths < 0 && days > 0) {
            totalMonths++;
            days -= end.lengthOfMonth();
        }
        long years = totalMonths / 12;  // safe
        int months = (int) (totalMonths % 12);  // safe
        return Period.of(Math.toIntExact(years), months, days);
    }

    
Returns a sequential ordered stream of dates. The returned stream starts from this date (inclusive) and goes to endExclusive (exclusive) by an incremental step of 1 day. 
 This method is equivalent to datesUntil(endExclusive, Period.ofDays(1)). 
Params:
  • endExclusive –  the end date, exclusive, not null
Throws:
Returns:a sequential Stream for the range of LocalDate values
Since:9
/**
     * Returns a sequential ordered stream of dates. The returned stream starts from this date
     * (inclusive) and goes to {@code endExclusive} (exclusive) by an incremental step of 1 day.
     * <p>
     * This method is equivalent to {@code datesUntil(endExclusive, Period.ofDays(1))}.
     *
     * @param endExclusive  the end date, exclusive, not null
     * @return a sequential {@code Stream} for the range of {@code LocalDate} values
     * @throws IllegalArgumentException if end date is before this date
     * @since 9
     */
    public Stream<LocalDate> datesUntil(LocalDate endExclusive) {
        long end = endExclusive.toEpochDay();
        long start = toEpochDay();
        if (end < start) {
            throw new IllegalArgumentException(endExclusive + " < " + this);
        }
        return LongStream.range(start, end).mapToObj(LocalDate::ofEpochDay);
    }

    
Returns a sequential ordered stream of dates by given incremental step. The returned stream starts from this date (inclusive) and goes to endExclusive (exclusive). 
 The n-th date which appears in the stream is equal to this.plus(step.multipliedBy(n)) (but the result of step multiplication never overflows). For example, if this date is 2015-01-31, the end date is 2015-05-01 and the step is 1 month, then the stream contains 2015-01-31, 2015-02-28, 2015-03-31, and 2015-04-30. 
Params:
  • endExclusive –  the end date, exclusive, not null
  • step –  the non-zero, non-negative Period which represents the step.
Throws:
  • IllegalArgumentException – if step is zero, or step.getDays() and step.toTotalMonths() have opposite sign, or end date is before this date and step is positive, or end date is after this date and step is negative
Returns:a sequential Stream for the range of LocalDate values
Since:9
/**
     * Returns a sequential ordered stream of dates by given incremental step. The returned stream
     * starts from this date (inclusive) and goes to {@code endExclusive} (exclusive).
     * <p>
     * The n-th date which appears in the stream is equal to {@code this.plus(step.multipliedBy(n))}
     * (but the result of step multiplication never overflows). For example, if this date is
     * {@code 2015-01-31}, the end date is {@code 2015-05-01} and the step is 1 month, then the
     * stream contains {@code 2015-01-31}, {@code 2015-02-28}, {@code 2015-03-31}, and
     * {@code 2015-04-30}.
     *
     * @param endExclusive  the end date, exclusive, not null
     * @param step  the non-zero, non-negative {@code Period} which represents the step.
     * @return a sequential {@code Stream} for the range of {@code LocalDate} values
     * @throws IllegalArgumentException if step is zero, or {@code step.getDays()} and
     *             {@code step.toTotalMonths()} have opposite sign, or end date is before this date
     *             and step is positive, or end date is after this date and step is negative
     * @since 9
     */
    public Stream<LocalDate> datesUntil(LocalDate endExclusive, Period step) {
        if (step.isZero()) {
            throw new IllegalArgumentException("step is zero");
        }
        long end = endExclusive.toEpochDay();
        long start = toEpochDay();
        long until = end - start;
        long months = step.toTotalMonths();
        long days = step.getDays();
        if ((months < 0 && days > 0) || (months > 0 && days < 0)) {
            throw new IllegalArgumentException("period months and days are of opposite sign");
        }
        if (until == 0) {
            return Stream.empty();
        }
        int sign = months > 0 || days > 0 ? 1 : -1;
        if (sign < 0 ^ until < 0) {
            throw new IllegalArgumentException(endExclusive + (sign < 0 ? " > " : " < ") + this);
        }
        if (months == 0) {
            long steps = (until - sign) / days; // non-negative
            return LongStream.rangeClosed(0, steps).mapToObj(
                    n -> LocalDate.ofEpochDay(start + n * days));
        }
        // 48699/1600 = 365.2425/12, no overflow, non-negative result
        long steps = until * 1600 / (months * 48699 + days * 1600) + 1;
        long addMonths = months * steps;
        long addDays = days * steps;
        long maxAddMonths = months > 0 ? MAX.getProlepticMonth() - getProlepticMonth()
                : getProlepticMonth() - MIN.getProlepticMonth();
        // adjust steps estimation
        if (addMonths * sign > maxAddMonths
                || (plusMonths(addMonths).toEpochDay() + addDays) * sign >= end * sign) {
            steps--;
            addMonths -= months;
            addDays -= days;
            if (addMonths * sign > maxAddMonths
                    || (plusMonths(addMonths).toEpochDay() + addDays) * sign >= end * sign) {
                steps--;
            }
        }
        return LongStream.rangeClosed(0, steps).mapToObj(
                n -> this.plusMonths(months * n).plusDays(days * n));
    }

    
Formats this date using the specified formatter.


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

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

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

    
Combines this date with a time to create a LocalDateTime. 
 This returns a LocalDateTime formed from this date at the specified hour and minute. The seconds and nanosecond fields will be set to zero. The individual time fields must be within their valid range. All possible combinations of date and time are valid. 
Params:
  • hour –  the hour-of-day to use, from 0 to 23
  • minute –  the minute-of-hour to use, from 0 to 59
Throws:
Returns:the local date-time formed from this date and the specified time, not null
/**
     * Combines this date with a time to create a {@code LocalDateTime}.
     * <p>
     * This returns a {@code LocalDateTime} formed from this date at the
     * specified hour and minute.
     * The seconds and nanosecond fields will be set to zero.
     * The individual time fields must be within their valid range.
     * All possible combinations of date and time are valid.
     *
     * @param hour  the hour-of-day to use, from 0 to 23
     * @param minute  the minute-of-hour to use, from 0 to 59
     * @return the local date-time formed from this date and the specified time, not null
     * @throws DateTimeException if the value of any field is out of range
     */
    public LocalDateTime atTime(int hour, int minute) {
        return atTime(LocalTime.of(hour, minute));
    }

    
Combines this date with a time to create a LocalDateTime. 
 This returns a LocalDateTime formed from this date at the specified hour, minute and second. The nanosecond field will be set to zero. The individual time fields must be within their valid range. All possible combinations of date and time are valid. 
Params:
  • hour –  the hour-of-day to use, from 0 to 23
  • minute –  the minute-of-hour to use, from 0 to 59
  • second –  the second-of-minute to represent, from 0 to 59
Throws:
Returns:the local date-time formed from this date and the specified time, not null
/**
     * Combines this date with a time to create a {@code LocalDateTime}.
     * <p>
     * This returns a {@code LocalDateTime} formed from this date at the
     * specified hour, minute and second.
     * The nanosecond field will be set to zero.
     * The individual time fields must be within their valid range.
     * All possible combinations of date and time are valid.
     *
     * @param hour  the hour-of-day to use, from 0 to 23
     * @param minute  the minute-of-hour to use, from 0 to 59
     * @param second  the second-of-minute to represent, from 0 to 59
     * @return the local date-time formed from this date and the specified time, not null
     * @throws DateTimeException if the value of any field is out of range
     */
    public LocalDateTime atTime(int hour, int minute, int second) {
        return atTime(LocalTime.of(hour, minute, second));
    }

    
Combines this date with a time to create a LocalDateTime. 
 This returns a LocalDateTime formed from this date at the specified hour, minute, second and nanosecond. The individual time fields must be within their valid range. All possible combinations of date and time are valid. 
Params:
  • hour –  the hour-of-day to use, from 0 to 23
  • minute –  the minute-of-hour to use, from 0 to 59
  • second –  the second-of-minute to represent, from 0 to 59
  • nanoOfSecond –  the nano-of-second to represent, from 0 to 999,999,999
Throws:
Returns:the local date-time formed from this date and the specified time, not null
/**
     * Combines this date with a time to create a {@code LocalDateTime}.
     * <p>
     * This returns a {@code LocalDateTime} formed from this date at the
     * specified hour, minute, second and nanosecond.
     * The individual time fields must be within their valid range.
     * All possible combinations of date and time are valid.
     *
     * @param hour  the hour-of-day to use, from 0 to 23
     * @param minute  the minute-of-hour to use, from 0 to 59
     * @param second  the second-of-minute to represent, from 0 to 59
     * @param nanoOfSecond  the nano-of-second to represent, from 0 to 999,999,999
     * @return the local date-time formed from this date and the specified time, not null
     * @throws DateTimeException if the value of any field is out of range
     */
    public LocalDateTime atTime(int hour, int minute, int second, int nanoOfSecond) {
        return atTime(LocalTime.of(hour, minute, second, nanoOfSecond));
    }

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

    
Combines this date with the time of midnight to create a LocalDateTime at the start of this date. 
 This returns a LocalDateTime formed from this date at the time of midnight, 00:00, at the start of this date. 
Returns:the local date-time of midnight at the start of this date, not null
/**
     * Combines this date with the time of midnight to create a {@code LocalDateTime}
     * at the start of this date.
     * <p>
     * This returns a {@code LocalDateTime} formed from this date at the time of
     * midnight, 00:00, at the start of this date.
     *
     * @return the local date-time of midnight at the start of this date, not null
     */
    public LocalDateTime atStartOfDay() {
        return LocalDateTime.of(this, LocalTime.MIDNIGHT);
    }

    
Returns a zoned date-time from this date at the earliest valid time according
to the rules in the time-zone.


Time-zone rules, such as daylight savings, mean that not every local date-time
is valid for the specified zone, thus the local date-time may not be midnight.


In most cases, there is only one valid offset for a local date-time.
In the case of an overlap, there are two valid offsets, and the earlier one is used,
corresponding to the first occurrence of midnight on the date.
In the case of a gap, the zoned date-time will represent the instant just after the gap.

 If the zone ID is a ZoneOffset, then the result always has a time of midnight. 
 To convert to a specific time in a given time-zone call atTime(LocalTime) followed by LocalDateTime.atZone(ZoneId). 
Params:
  • zone –  the zone ID to use, not null
Returns:the zoned date-time formed from this date and the earliest valid time for the zone, not null
/**
     * Returns a zoned date-time from this date at the earliest valid time according
     * to the rules in the time-zone.
     * <p>
     * Time-zone rules, such as daylight savings, mean that not every local date-time
     * is valid for the specified zone, thus the local date-time may not be midnight.
     * <p>
     * In most cases, there is only one valid offset for a local date-time.
     * In the case of an overlap, there are two valid offsets, and the earlier one is used,
     * corresponding to the first occurrence of midnight on the date.
     * In the case of a gap, the zoned date-time will represent the instant just after the gap.
     * <p>
     * If the zone ID is a {@link ZoneOffset}, then the result always has a time of midnight.
     * <p>
     * To convert to a specific time in a given time-zone call {@link #atTime(LocalTime)}
     * followed by {@link LocalDateTime#atZone(ZoneId)}.
     *
     * @param zone  the zone ID to use, not null
     * @return the zoned date-time formed from this date and the earliest valid time for the zone, not null
     */
    public ZonedDateTime atStartOfDay(ZoneId zone) {
        Objects.requireNonNull(zone, "zone");
        // need to handle case where there is a gap from 11:30 to 00:30
        // standard ZDT factory would result in 01:00 rather than 00:30
        LocalDateTime ldt = atTime(LocalTime.MIDNIGHT);
        if (zone instanceof ZoneOffset == false) {
            ZoneRules rules = zone.getRules();
            ZoneOffsetTransition trans = rules.getTransition(ldt);
            if (trans != null && trans.isGap()) {
                ldt = trans.getDateTimeAfter();
            }
        }
        return ZonedDateTime.of(ldt, zone);
    }

    //-----------------------------------------------------------------------
    @Override
    public long toEpochDay() {
        long y = year;
        long m = month;
        long total = 0;
        total += 365 * y;
        if (y >= 0) {
            total += (y + 3) / 4 - (y + 99) / 100 + (y + 399) / 400;
        } else {
            total -= y / -4 - y / -100 + y / -400;
        }
        total += ((367 * m - 362) / 12);
        total += day - 1;
        if (m > 2) {
            total--;
            if (isLeapYear() == false) {
                total--;
            }
        }
        return total - DAYS_0000_TO_1970;
    }

    
Converts this LocalDate to the number of seconds since the epoch of 1970-01-01T00:00:00Z. 

This combines this local date with the specified time and
offset to calculate the epoch-second value, which is the
number of elapsed seconds from 1970-01-01T00:00:00Z.
Instants on the time-line after the epoch are positive, earlier
are negative.

Params:
  • time – the local time, not null
  • offset – the zone offset, not null
Returns:the number of seconds since the epoch of 1970-01-01T00:00:00Z, may be negative
Since:9
/**
     * Converts this {@code LocalDate} to the number of seconds since the epoch
     * of 1970-01-01T00:00:00Z.
     * <p>
     * This combines this local date with the specified time and
     * offset to calculate the epoch-second value, which is the
     * number of elapsed seconds from 1970-01-01T00:00:00Z.
     * Instants on the time-line after the epoch are positive, earlier
     * are negative.
     *
     * @param time the local time, not null
     * @param offset the zone offset, not null
     * @return the number of seconds since the epoch of 1970-01-01T00:00:00Z, may be negative
     * @since 9
     */
    public long toEpochSecond(LocalTime time, ZoneOffset offset) {
        Objects.requireNonNull(time, "time");
        Objects.requireNonNull(offset, "offset");
        long secs = toEpochDay() * SECONDS_PER_DAY + time.toSecondOfDay();
        secs -= offset.getTotalSeconds();
        return secs;
    }

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

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

    int compareTo0(LocalDate otherDate) {
        int cmp = (year - otherDate.year);
        if (cmp == 0) {
            cmp = (month - otherDate.month);
            if (cmp == 0) {
                cmp = (day - otherDate.day);
            }
        }
        return cmp;
    }

    
Checks if this date is after the specified date.


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

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



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

    
Checks if this date is before the specified date.


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

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



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

    
Checks if this date is equal to the specified date.


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

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



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

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

 Compares this LocalDate with another ensuring that the date is the same. 
 Only objects of type LocalDate are compared, other types return false. To compare the dates of two TemporalAccessor instances, including dates in two different chronologies, use ChronoField.EPOCH_DAY as a comparator. 
Params:
  • obj –  the object to check, null returns false
Returns:true if this is equal to the other date
/**
     * Checks if this date is equal to another date.
     * <p>
     * Compares this {@code LocalDate} with another ensuring that the date is the same.
     * <p>
     * Only objects of type {@code LocalDate} are compared, other types return false.
     * To compare the dates of two {@code TemporalAccessor} instances, including dates
     * in two different chronologies, use {@link ChronoField#EPOCH_DAY} as a comparator.
     *
     * @param obj  the object to check, null returns false
     * @return true if this is equal to the other date
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj instanceof LocalDate) {
            return compareTo0((LocalDate) obj) == 0;
        }
        return false;
    }

    
A hash code for this date.

Returns:a suitable hash code
/**
     * A hash code for this date.
     *
     * @return a suitable hash code
     */
    @Override
    public int hashCode() {
        int yearValue = year;
        int monthValue = month;
        int dayValue = day;
        return (yearValue & 0xFFFFF800) ^ ((yearValue << 11) + (monthValue << 6) + (dayValue));
    }

    //-----------------------------------------------------------------------
    
Outputs this date as a String, such as 2007-12-03. 
 The output will be in the ISO-8601 format uuuu-MM-dd. 
Returns:a string representation of this date, not null
/**
     * Outputs this date as a {@code String}, such as {@code 2007-12-03}.
     * <p>
     * The output will be in the ISO-8601 format {@code uuuu-MM-dd}.
     *
     * @return a string representation of this date, not null
     */
    @Override
    public String toString() {
        int yearValue = year;
        int monthValue = month;
        int dayValue = day;
        int absYear = Math.abs(yearValue);
        StringBuilder buf = new StringBuilder(10);
        if (absYear < 1000) {
            if (yearValue < 0) {
                buf.append(yearValue - 10000).deleteCharAt(1);
            } else {
                buf.append(yearValue + 10000).deleteCharAt(0);
            }
        } else {
            if (yearValue > 9999) {
                buf.append('+');
            }
            buf.append(yearValue);
        }
        return buf.append(monthValue < 10 ? "-0" : "-")
            .append(monthValue)
            .append(dayValue < 10 ? "-0" : "-")
            .append(dayValue)
            .toString();
    }

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

@serialData

 out.writeByte(3);  // identifies a LocalDate
 out.writeInt(year);
 out.writeByte(month);
 out.writeByte(day);

Returns:the instance of Ser, not null
/**
     * Writes the object using a
     * <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
     * @serialData
     * <pre>
     *  out.writeByte(3);  // identifies a LocalDate
     *  out.writeInt(year);
     *  out.writeByte(month);
     *  out.writeByte(day);
     * </pre>
     *
     * @return the instance of {@code Ser}, not null
     */
    private Object writeReplace() {
        return new Ser(Ser.LOCAL_DATE_TYPE, this);
    }

    
Defend against malicious streams.

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

    void writeExternal(DataOutput out) throws IOException {
        out.writeInt(year);
        out.writeByte(month);
        out.writeByte(day);
    }

    static LocalDate readExternal(DataInput in) throws IOException {
        int year = in.readInt();
        int month = in.readByte();
        int dayOfMonth = in.readByte();
        return LocalDate.of(year, month, dayOfMonth);
    }

}