--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/java/time/LocalDate.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,2082 @@
+/*
+ * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * This file is available under and governed by the GNU General Public
+ * License version 2 only, as published by the Free Software Foundation.
+ * However, the following notice accompanied the original version of this
+ * file:
+ *
+ * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * * Neither the name of JSR-310 nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * 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.Era;
+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;
+
+/**
+ * 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/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 {@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 {@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);
+
+ /**
+ * Serialization version.
+ */
+ private static final long serialVersionUID = 2942565459149668126L;
+ /**
+ * 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.
+ */
+ static final long DAYS_0000_TO_1970 = (DAYS_PER_CYCLE * 5L) - (30L * 365L + 7L);
+
+ /**
+ * The year.
+ */
+ private final int year;
+ /**
+ * The month-of-year.
+ */
+ private final short month;
+ /**
+ * The day-of-month.
+ */
+ private final short day;
+
+ //-----------------------------------------------------------------------
+ /**
+ * 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.
+ * <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.
+ * <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");
+ // inline to avoid creating object and Instant checks
+ final Instant now = clock.instant(); // called once
+ ZoneOffset offset = clock.getZone().getRules().getOffset(now);
+ long epochSec = now.getEpochSecond() + offset.getTotalSeconds(); // overflow caught later
+ long epochDay = Math.floorDiv(epochSec, SECONDS_PER_DAY);
+ return LocalDate.ofEpochDay(epochDay);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * 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 {@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 {@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 {@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) {
+ 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 {@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 {@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 {@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.
+ *
+ * @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.
+ *
+ * @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.
+ *
+ * @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.
+ * <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.
+ * <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.
+ * <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 {@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 {@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.
+ * <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.
+ * <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.
+ * <p>
+ * The returned era will be a singleton capable of being compared with the constants
+ * in {@link IsoChronology} using the {@code ==} operator.
+ *
+ * @return the {@code IsoChronology} era constant applicable at this date, not null
+ */
+ @Override // override for Javadoc
+ public Era getEra() {
+ return ChronoLocalDate.super.getEra();
+ }
+
+ /**
+ * 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.
+ * <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 {@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.
+ * <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.
+ * <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 {@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 = (int)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.
+ * <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.
+ * <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.
+ * <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.
+ * <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.
+ * <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 {@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 {@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 {@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 {@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.
+ * <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.
+ * <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 {@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 {@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 = (int)Math.floorMod(calcMonths, 12) + 1;
+ return resolvePreviousValid(newYear, newMonth, day);
+ }
+
+ /**
+ * 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 {@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 mjDay = Math.addExact(toEpochDay(), daysToAdd);
+ return LocalDate.ofEpochDay(mjDay);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * 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.
+ * <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 {@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 {@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 {@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 {@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.
+ * <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.
+ * <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.
+ * <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 {@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);
+ }
+
+ /**
+ * 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 {@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 {@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 {@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 {@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 {@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 {@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.
+ * <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;
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * 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.
+ * <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.
+ * <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.
+ * <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.
+ * <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.
+ *
+ * @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 {@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
+ * <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.
+ *
+ * @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);
+ }
+
+}