* {@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);
}
}