+ * {@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}. + *
+ * 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 will query the {@link Clock#systemDefaultZone() 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. + * + * @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 {@link Clock#system(ZoneId) 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. + * + * @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 {@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 OffsetDate factory to avoid creating object and InstantProvider 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. + *
+ * 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 + * @throws DateTimeException 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, dayOfMonth); + } + + /** + * Obtains an instance of {@code LocalDate} from a year, month and day. + *
+ * 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 + * @throws DateTimeException 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.of(month), dayOfMonth); + } + + //----------------------------------------------------------------------- + /** + * Obtains an instance of {@code LocalDate} from a 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 + * @throws DateTimeException if the day-of-year is invalid for the month-year + */ + public static LocalDate ofYearDay(int year, int dayOfYear) { + YEAR.checkValidValue(year); + DAY_OF_YEAR.checkValidValue(dayOfYear); + boolean leap = ISOChrono.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 create(year, moy, dom); + } + + //----------------------------------------------------------------------- + /** + * Obtains an instance of {@code LocalDate} from the epoch day count. + *
+ * The Epoch Day count 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 days 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. + *
+ * A {@code TemporalAccessor} represents some form of date and time information. + * This factory converts the arbitrary temporal object to an instance of {@code LocalDate}. + *
+ * The conversion extracts the {@link ChronoField#EPOCH_DAY EPOCH_DAY} field. + *
+ * 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) { + if (temporal instanceof LocalDate) { + return (LocalDate) temporal; + } else if (temporal instanceof LocalDateTime) { + return ((LocalDateTime) temporal).getDate(); + } else if (temporal instanceof ZonedDateTime) { + return ((ZonedDateTime) temporal).getDate(); + } + // handle builder as a special case + if (temporal instanceof DateTimeBuilder) { + DateTimeBuilder builder = (DateTimeBuilder) temporal; + LocalDate date = builder.extract(LocalDate.class); + if (date != null) { + return date; + } + } + try { + return ofEpochDay(temporal.getLong(EPOCH_DAY)); + } catch (DateTimeException ex) { + throw new DateTimeException("Unable to obtain LocalDate from TemporalAccessor: " + temporal.getClass(), ex); + } + } + + //----------------------------------------------------------------------- + /** + * Obtains an instance of {@code LocalDate} from a text string such as {@code 2007-12-03}. + *
+ * The string must represent a valid date and is parsed using + * {@link java.time.format.DateTimeFormatters#isoLocalDate()}. + * + * @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, DateTimeFormatters.isoLocalDate()); + } + + /** + * Obtains an instance of {@code LocalDate} from a text string using a specific formatter. + *
+ * 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, validated not null + * @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, Month month, int dayOfMonth) { + if (dayOfMonth > 28 && dayOfMonth > month.length(ISOChrono.INSTANCE.isLeapYear(year))) { + if (dayOfMonth == 29) { + throw new DateTimeException("Invalid date 'February 29' as '" + year + "' is not a leap year"); + } else { + throw new DateTimeException("Invalid date '" + month.name() + " " + dayOfMonth + "'"); + } + } + return new LocalDate(year, month.getValue(), 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, ISOChrono.INSTANCE.isLeapYear(year) ? 29 : 28); + break; + case 4: + case 6: + case 9: + case 11: + day = Math.min(day, 30); + break; + } + return LocalDate.of(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. + *
+ * This checks if this date can be queried for the specified field. + * If false, then calling the {@link #range(TemporalField) range} and + * {@link #get(TemporalField) get} methods will throw an exception. + *
+ * If the field is a {@link ChronoField} then the query is implemented here. + * The {@link #isSupported(TemporalField) supported fields} will return valid + * values based on this date-time. + * The supported fields are: + *
+ * If the field is not a {@code ChronoField}, then the result of this method + * is obtained by invoking {@code TemporalField.doIsSupported(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); + } + + /** + * 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 {@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 a {@code DateTimeException}. + *
+ * If the field is not a {@code ChronoField}, then the result of this method + * is obtained by invoking {@code TemporalField.doRange(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 + */ + @Override + public ValueRange range(TemporalField field) { + if (field instanceof ChronoField) { + ChronoField f = (ChronoField) field; + if (f.isDateField()) { + 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 DateTimeException("Unsupported field: " + field.getName()); + } + return field.doRange(this); + } + + /** + * Gets the value of the specified field from this date as an {@code int}. + *
+ * This queries this date for the value for 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 {@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 EPOCH_MONTH} + * which are too large to fit in an {@code int} and throw a {@code DateTimeException}. + * All other {@code ChronoField} instances will throw a {@code DateTimeException}. + *
+ * If the field is not a {@code ChronoField}, then the result of this method + * is obtained by invoking {@code TemporalField.doGet(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 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}. + *
+ * This queries this date for the value for 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 {@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 a {@code DateTimeException}. + *
+ * If the field is not a {@code ChronoField}, then the result of this method + * is obtained by invoking {@code TemporalField.doGet(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 ArithmeticException if numeric overflow occurs + */ + @Override + public long getLong(TemporalField field) { + if (field instanceof ChronoField) { + if (field == EPOCH_DAY) { + return toEpochDay(); + } + if (field == EPOCH_MONTH) { + return getEpochMonth(); + } + return get0(field); + } + return field.doGet(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 DateTimeException("Field too large for an int: " + field); + 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 EPOCH_MONTH: throw new DateTimeException("Field too large for an int: " + field); + case YEAR_OF_ERA: return (year >= 1 ? year : 1 - year); + case YEAR: return year; + case ERA: return (year >= 1 ? 1 : 0); + } + throw new DateTimeException("Unsupported field: " + field.getName()); + } + + private long getEpochMonth() { + return ((year - 1970) * 12L) + (month - 1); + } + + //----------------------------------------------------------------------- + /** + * Gets the chronology of this date, which is the ISO calendar system. + *
+ * The {@code Chrono} 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 todays's rules for leap years are applied for all time. + * + * @return the ISO chronology, not null + */ + @Override + public ISOChrono getChrono() { + return ISOChrono.INSTANCE; + } + + /** + * Gets the era applicable at this date. + *
+ * The official ISO-8601 standard does not define eras, however {@code ISOChrono} 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 {@link ChronoLocalDate} contract where it is necessary to support + * the Japanese calendar system. + *
+ * The returned era will be a singleton capable of being compared with the constants
+ * in {@link ISOChrono} using the {@code ==} operator.
+ *
+ * @return the {@code ISOChrono} era constant applicable at this date, not null
+ */
+ @Override // override for Javadoc
+ public Era
+ * This method returns the primitive {@code int} value for the year.
+ *
+ * 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 {@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.
+ *
+ * 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 {@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 {@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}.
+ *
+ * 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}.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * @return true if the year is leap, false otherwise
+ */
+ @Override // override for Javadoc and performance
+ public boolean isLeapYear() {
+ return ISOChrono.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.
+ *
+ * @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.
+ *
+ * @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 new {@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.
+ *
+ * A simple adjuster might simply set the one of the fields, such as the year field.
+ * A more complex adjuster might set the date to the last day of the month.
+ * A selection of common adjustments is provided in {@link java.time.temporal.Adjusters}.
+ * 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.temporal.MonthDay 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:
+ *
+ * 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.
+ *
+ * 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 new {@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.
+ *
+ * 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 {@link ChronoField} then the adjustment is implemented here.
+ * The supported fields behave as follows:
+ *
+ * In all cases, if the new value is outside the valid range of values for the field
+ * then a {@code DateTimeException} will be thrown.
+ *
+ * All other {@code ChronoField} instances will throw a {@code DateTimeException}.
+ *
+ * If the field is not a {@code ChronoField}, then the result of this method
+ * is obtained by invoking {@code TemporalField.doWith(Temporal, long)}
+ * passing {@code 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.
+ *
+ * @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 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 EPOCH_MONTH: return plusMonths(newValue - getLong(EPOCH_MONTH));
+ 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 DateTimeException("Unsupported field: " + field.getName());
+ }
+ return field.doWith(this, newValue);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Returns a copy of this date 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.
+ *
+ * @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 date 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.
+ *
+ * @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 date 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.
+ *
+ * @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
+ * @throws DateTimeException 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 date 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.
+ *
+ * @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
+ * @throws DateTimeException 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 period added.
+ *
+ * This method returns a new date based on this date with the specified period added.
+ * The adder is typically {@link Period} but may be any other type implementing
+ * the {@link TemporalAdder} interface.
+ * The calculation is delegated to the specified adjuster, which typically calls
+ * back to {@link #plus(long, TemporalUnit)}.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @param adder the adder to use, 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(TemporalAdder adder) {
+ return (LocalDate) adder.addTo(this);
+ }
+
+ /**
+ * Returns a copy of this date with the specified period added.
+ *
+ * This method returns a new date based on this date with the specified period added.
+ * This can be used to add any period that is defined by a unit, for example to add years, months or days.
+ * The unit is responsible for the details of the calculation, including the resolution
+ * of any edge cases in the calculation.
+ *
+ * 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 period to add, not null
+ * @return a {@code LocalDate} based on this date with the specified period added, not null
+ * @throws DateTimeException if the unit cannot be added to this type
+ */
+ @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 DateTimeException("Unsupported unit: " + unit.getName());
+ }
+ return unit.doPlus(this, amountToAdd);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Returns a copy of this {@code LocalDate} with the specified period in years added.
+ *
+ * This method adds the specified amount to the years field in three steps:
+ *
+ * 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.
+ *
+ * @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 period in months added.
+ *
+ * This method adds the specified amount to the months field in three steps:
+ *
+ * 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.
+ *
+ * @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 period in 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.
+ *
+ * @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.
+ *
+ * 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.
+ *
+ * @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 period subtracted.
+ *
+ * This method returns a new date based on this date with the specified period subtracted.
+ * The subtractor is typically {@link Period} but may be any other type implementing
+ * the {@link TemporalSubtractor} interface.
+ * The calculation is delegated to the specified adjuster, which typically calls
+ * back to {@link #minus(long, TemporalUnit)}.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @param subtractor the subtractor to use, 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(TemporalSubtractor subtractor) {
+ return (LocalDate) subtractor.subtractFrom(this);
+ }
+
+ /**
+ * Returns a copy of this date with the specified period subtracted.
+ *
+ * This method returns a new date based on this date with the specified period subtracted.
+ * This can be used to subtract any period that is defined by a unit, for example to subtract years, months or days.
+ * The unit is responsible for the details of the calculation, including the resolution
+ * of any edge cases in the calculation.
+ *
+ * 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 period to subtract, not null
+ * @return a {@code LocalDate} based on this date with the specified period subtracted, not null
+ * @throws DateTimeException if the unit cannot be added to this type
+ */
+ @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 period in years subtracted.
+ *
+ * This method subtracts the specified amount from the years field in three steps:
+ *
+ * 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.
+ *
+ * @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 period in months subtracted.
+ *
+ * This method subtracts the specified amount from the months field in three steps:
+ *
+ * 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.
+ *
+ * @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 period in 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.
+ *
+ * @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.
+ *
+ * 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.
+ *
+ * @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 {@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.
+ *
+ * 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
+ * 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 {@link Temporal#with(TemporalField, long)}
+ * passing {@link ChronoField#EPOCH_DAY} as the field.
+ *
+ * In most cases, it is clearer to reverse the calling pattern by using
+ * {@link Temporal#with(TemporalAdjuster)}:
+ *
+ * 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 period between this date and another date in
+ * terms of the specified unit.
+ *
+ * This calculates the period between two dates in terms of a single unit.
+ * 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 must be a {@code LocalDate}.
+ * For example, the period in days between two dates can be calculated
+ * using {@code startDate.periodUntil(endDate, DAYS)}.
+ *
+ * The calculation returns a whole number, representing the number of
+ * complete units between the two dates.
+ * For example, the period in months between 2012-06-15 and 2012-08-14
+ * will only be one month as it is one day short of two months.
+ *
+ * This method operates in association with {@link TemporalUnit#between}.
+ * The result of this method is a {@code long} representing the amount of
+ * the specified unit. By contrast, the result of {@code between} is an
+ * object that can be used directly in addition/subtraction:
+ *
+ * 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.
+ *
+ * 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 input temporal as
+ * the second argument.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @param endDate the end date, which must be a {@code LocalDate}, not null
+ * @param unit the unit to measure the period in, not null
+ * @return the amount of the period between this date and the end date
+ * @throws DateTimeException if the period cannot be calculated
+ * @throws ArithmeticException if numeric overflow occurs
+ */
+ @Override
+ public long periodUntil(Temporal endDate, TemporalUnit unit) {
+ if (endDate instanceof LocalDate == false) {
+ Objects.requireNonNull(endDate, "endDate");
+ throw new DateTimeException("Unable to calculate period between objects of two different types");
+ }
+ LocalDate end = (LocalDate) endDate;
+ 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 DateTimeException("Unsupported unit: " + unit.getName());
+ }
+ return unit.between(this, endDate).getAmount();
+ }
+
+ long daysUntil(LocalDate end) {
+ return end.toEpochDay() - toEpochDay(); // no overflow
+ }
+
+ private long monthsUntil(LocalDate end) {
+ long packed1 = getEpochMonth() * 32L + getDayOfMonth(); // no overflow
+ long packed2 = end.getEpochMonth() * 32L + end.getDayOfMonth(); // no overflow
+ return (packed2 - packed1) / 32;
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Returns a local date-time formed from this date at the specified time.
+ *
+ * This combines this date with the specified time to form a {@code LocalDateTime}.
+ * All possible combinations of date and time are valid.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @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);
+ }
+
+ /**
+ * Returns a local date-time formed from this date at the specified time.
+ *
+ * This combines this date with the specified time to form a {@code LocalDateTime}.
+ * The individual time fields must be within their valid range.
+ * All possible combinations of date and time are valid.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @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));
+ }
+
+ /**
+ * Returns a local date-time formed from this date at the specified time.
+ *
+ * This combines this date with the specified time to form a {@code LocalDateTime}.
+ * The individual time fields must be within their valid range.
+ * All possible combinations of date and time are valid.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @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));
+ }
+
+ /**
+ * Returns a local date-time formed from this date at the specified time.
+ *
+ * This combines this date with the specified time to form a {@code LocalDateTime}.
+ * The individual time fields must be within their valid range.
+ * All possible combinations of date and time are valid.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @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));
+ }
+
+ /**
+ * Returns an offset date formed from this date and the specified offset.
+ *
+ * This combines this date with the specified offset to form an {@code OffsetDate}.
+ * All possible combinations of date and offset are valid.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @param offset the offset to combine with, not null
+ * @return the offset date formed from this date and the specified offset, not null
+ */
+ public OffsetDate atOffset(ZoneOffset offset) {
+ return OffsetDate.of(this, offset);
+ }
+
+ /**
+ * 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 {@link ZoneOffset}, then the result always has a time of midnight.
+ *
+ * To convert to a specific time in a given time-zone call {@link #atTime(LocalTime)}
+ * followed by {@link LocalDateTime#atZone(ZoneId)}.
+ *
+ * This instance is immutable and unaffected by this method call.
+ *
+ * @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.
+ *
+ * The comparison is primarily based on the date, from earliest to latest.
+ * It is "consistent with equals", as defined by {@link Comparable}.
+ *
+ * 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.temporal.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.
+ *
+ * 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 #DATE_COMPARATOR}.
+ *
+ * @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.
+ *
+ * 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 #DATE_COMPARATOR}.
+ *
+ * @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.
+ *
+ * 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 #DATE_COMPARATOR}.
+ *
+ * @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 {@code LocalDate} with another ensuring that the date is the same.
+ *
+ * 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}.
+ *
+ * The output will be in the ISO-8601 format {@code yyyy-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();
+ }
+
+ /**
+ * Outputs this date as a {@code String} using the formatter.
+ *
+ * This date will be passed to the formatter
+ * {@link DateTimeFormatter#print(TemporalAccessor) print method}.
+ *
+ * @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
+ public String toString(DateTimeFormatter formatter) {
+ return ChronoLocalDate.super.toString(formatter);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Writes the object using a
+ * dedicated serialized form.
+ *
+ * import static java.time.Month.*;
+ * import static java.time.temporal.Adjusters.*;
+ *
+ * result = localDate.with(JULY).with(lastDayOfMonth());
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ * // these two lines are equivalent, but the second approach is recommended
+ * temporal = thisLocalDate.adjustInto(temporal);
+ * temporal = temporal.with(thisLocalDate);
+ *
+ *
+ * long period = start.periodUntil(end, MONTHS); // this method
+ * dateTime.plus(MONTHS.between(start, end)); // use in plus/minus
+ *
+ *
+ * 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
+ *
+ *
+ * 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
+ *
+ *
+ * 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
+ *
+ *
+ * out.writeByte(3); // identifies this as a LocalDate
+ * out.writeInt(year);
+ * out.writeByte(month);
+ * out.writeByte(day);
+ *
+ *
+ * @return the instance of {@code Ser}, not null
+ */
+ private Object writeReplace() {
+ return new Ser(Ser.LOCAL_DATE_TYPE, this);
+ }
+
+ /**
+ * Defend against malicious streams.
+ * @return never
+ * @throws InvalidObjectException always
+ */
+ private Object readResolve() throws ObjectStreamException {
+ 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);
+ }
+
+}