- * This chronology defines the rules of the ISO calendar system. - * This calendar system is based on the ISO-8601 standard, which is the - * de facto world calendar. - *
- * The fields are defined as follows: - *
- * - *
- * The ID uniquely identifies the {@code Chrono}. - * It can be used to lookup the {@code Chrono} using {@link #of(String)}. - * - * @return the chronology ID - 'ISO' - * @see #getCalendarType() - */ - @Override - public String getId() { - return "ISO"; - } - - /** - * Gets the calendar type of the underlying calendar system - 'iso8601'. - *
- * The calendar type is an identifier defined by the
- * Unicode Locale Data Markup Language (LDML) specification.
- * It can be used to lookup the {@code Chrono} using {@link #of(String)}.
- * It can also be used as part of a locale, accessible via
- * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.
- *
- * @return the calendar system type - 'iso8601'
- * @see #getId()
- */
- @Override
- public String getCalendarType() {
- return "iso8601";
- }
-
- //-----------------------------------------------------------------------
- /**
- * Obtains an ISO local date from the era, year-of-era, month-of-year
- * and day-of-month fields.
- *
- * @param era the ISO era, not null
- * @param yearOfEra the ISO year-of-era
- * @param month the ISO month-of-year
- * @param dayOfMonth the ISO day-of-month
- * @return the ISO local date, not null
- * @throws DateTimeException if unable to create the date
- */
- @Override // override with covariant return type
- public LocalDate date(Era
- * This is equivalent to {@link LocalDate#of(int, int, int)}.
- *
- * @param prolepticYear the ISO proleptic-year
- * @param month the ISO month-of-year
- * @param dayOfMonth the ISO day-of-month
- * @return the ISO local date, not null
- * @throws DateTimeException if unable to create the date
- */
- @Override // override with covariant return type
- public LocalDate date(int prolepticYear, int month, int dayOfMonth) {
- return LocalDate.of(prolepticYear, month, dayOfMonth);
- }
-
- /**
- * Obtains an ISO local date from the era, year-of-era and day-of-year fields.
- *
- * @param era the ISO era, not null
- * @param yearOfEra the ISO year-of-era
- * @param dayOfYear the ISO day-of-year
- * @return the ISO local date, not null
- * @throws DateTimeException if unable to create the date
- */
- @Override // override with covariant return type
- public LocalDate dateYearDay(Era
- * This is equivalent to {@link LocalDate#ofYearDay(int, int)}.
- *
- * @param prolepticYear the ISO proleptic-year
- * @param dayOfYear the ISO day-of-year
- * @return the ISO local date, not null
- * @throws DateTimeException if unable to create the date
- */
- @Override // override with covariant return type
- public LocalDate dateYearDay(int prolepticYear, int dayOfYear) {
- return LocalDate.ofYearDay(prolepticYear, dayOfYear);
- }
-
- //-----------------------------------------------------------------------
- /**
- * Obtains an ISO local date from another date-time object.
- *
- * This is equivalent to {@link LocalDate#from(TemporalAccessor)}.
- *
- * @param temporal the date-time object to convert, not null
- * @return the ISO local date, not null
- * @throws DateTimeException if unable to create the date
- */
- @Override // override with covariant return type
- public LocalDate date(TemporalAccessor temporal) {
- return LocalDate.from(temporal);
- }
-
- /**
- * Obtains an ISO local date-time from another date-time object.
- *
- * This is equivalent to {@link LocalDateTime#from(TemporalAccessor)}.
- *
- * @param temporal the date-time object to convert, not null
- * @return the ISO local date-time, not null
- * @throws DateTimeException if unable to create the date-time
- */
- @Override // override with covariant return type
- public LocalDateTime localDateTime(TemporalAccessor temporal) {
- return LocalDateTime.from(temporal);
- }
-
- /**
- * Obtains an ISO zoned date-time from another date-time object.
- *
- * This is equivalent to {@link ZonedDateTime#from(TemporalAccessor)}.
- *
- * @param temporal the date-time object to convert, not null
- * @return the ISO zoned date-time, not null
- * @throws DateTimeException if unable to create the date-time
- */
- @Override // override with covariant return type
- public ZonedDateTime zonedDateTime(TemporalAccessor temporal) {
- return ZonedDateTime.from(temporal);
- }
-
- /**
- * Obtains an ISO zoned date-time in this chronology from an {@code Instant}.
- *
- * This is equivalent to {@link ZonedDateTime#ofInstant(Instant, ZoneId)}.
- *
- * @param instant the instant to create the date-time from, not null
- * @param zone the time-zone, not null
- * @return the zoned date-time, not null
- * @throws DateTimeException if the result exceeds the supported range
- */
- public ZonedDateTime zonedDateTime(Instant instant, ZoneId zone) {
- return ZonedDateTime.ofInstant(instant, zone);
- }
-
- //-----------------------------------------------------------------------
- /**
- * Obtains the current ISO local date from the system clock in the default time-zone.
- *
- * 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 ISO local date using the system clock and default time-zone, not null
- * @throws DateTimeException if unable to create the date
- */
- @Override // override with covariant return type
- public LocalDate dateNow() {
- return dateNow(Clock.systemDefaultZone());
- }
-
- /**
- * Obtains the current ISO local 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.
- *
- * @return the current ISO local date using the system clock, not null
- * @throws DateTimeException if unable to create the date
- */
- @Override // override with covariant return type
- public LocalDate dateNow(ZoneId zone) {
- return dateNow(Clock.system(zone));
- }
-
- /**
- * Obtains the current ISO local 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 ISO local date, not null
- * @throws DateTimeException if unable to create the date
- */
- @Override // override with covariant return type
- public LocalDate dateNow(Clock clock) {
- Objects.requireNonNull(clock, "clock");
- return date(LocalDate.now(clock));
- }
-
- //-----------------------------------------------------------------------
- /**
- * 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.
- *
- * @param prolepticYear the ISO proleptic year to check
- * @return true if the year is leap, false otherwise
- */
- @Override
- public boolean isLeapYear(long prolepticYear) {
- return ((prolepticYear & 3) == 0) && ((prolepticYear % 100) != 0 || (prolepticYear % 400) == 0);
- }
-
- @Override
- public int prolepticYear(Era
+ * This chronology defines the rules of the ISO calendar system.
+ * This calendar system is based on the ISO-8601 standard, which is the
+ * de facto world calendar.
+ *
+ * The fields are defined as follows:
+ *
+ *
+ *
+ * The ID uniquely identifies the {@code Chronology}.
+ * It can be used to lookup the {@code Chronology} using {@link #of(String)}.
+ *
+ * @return the chronology ID - 'ISO'
+ * @see #getCalendarType()
+ */
+ @Override
+ public String getId() {
+ return "ISO";
+ }
+
+ /**
+ * Gets the calendar type of the underlying calendar system - 'iso8601'.
+ *
+ * The calendar type is an identifier defined by the
+ * Unicode Locale Data Markup Language (LDML) specification.
+ * It can be used to lookup the {@code Chronology} using {@link #of(String)}.
+ * It can also be used as part of a locale, accessible via
+ * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.
+ *
+ * @return the calendar system type - 'iso8601'
+ * @see #getId()
+ */
+ @Override
+ public String getCalendarType() {
+ return "iso8601";
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Obtains an ISO local date from the era, year-of-era, month-of-year
+ * and day-of-month fields.
+ *
+ * @param era the ISO era, not null
+ * @param yearOfEra the ISO year-of-era
+ * @param month the ISO month-of-year
+ * @param dayOfMonth the ISO day-of-month
+ * @return the ISO local date, not null
+ * @throws DateTimeException if unable to create the date
+ */
+ @Override // override with covariant return type
+ public LocalDate date(Era era, int yearOfEra, int month, int dayOfMonth) {
+ return date(prolepticYear(era, yearOfEra), month, dayOfMonth);
+ }
+
+ /**
+ * Obtains an ISO local date from the proleptic-year, month-of-year
+ * and day-of-month fields.
+ *
+ * This is equivalent to {@link LocalDate#of(int, int, int)}.
+ *
+ * @param prolepticYear the ISO proleptic-year
+ * @param month the ISO month-of-year
+ * @param dayOfMonth the ISO day-of-month
+ * @return the ISO local date, not null
+ * @throws DateTimeException if unable to create the date
+ */
+ @Override // override with covariant return type
+ public LocalDate date(int prolepticYear, int month, int dayOfMonth) {
+ return LocalDate.of(prolepticYear, month, dayOfMonth);
+ }
+
+ /**
+ * Obtains an ISO local date from the era, year-of-era and day-of-year fields.
+ *
+ * @param era the ISO era, not null
+ * @param yearOfEra the ISO year-of-era
+ * @param dayOfYear the ISO day-of-year
+ * @return the ISO local date, not null
+ * @throws DateTimeException if unable to create the date
+ */
+ @Override // override with covariant return type
+ public LocalDate dateYearDay(Era era, int yearOfEra, int dayOfYear) {
+ return dateYearDay(prolepticYear(era, yearOfEra), dayOfYear);
+ }
+
+ /**
+ * Obtains an ISO local date from the proleptic-year and day-of-year fields.
+ *
+ * This is equivalent to {@link LocalDate#ofYearDay(int, int)}.
+ *
+ * @param prolepticYear the ISO proleptic-year
+ * @param dayOfYear the ISO day-of-year
+ * @return the ISO local date, not null
+ * @throws DateTimeException if unable to create the date
+ */
+ @Override // override with covariant return type
+ public LocalDate dateYearDay(int prolepticYear, int dayOfYear) {
+ return LocalDate.ofYearDay(prolepticYear, dayOfYear);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Obtains an ISO local date from another date-time object.
+ *
+ * This is equivalent to {@link LocalDate#from(TemporalAccessor)}.
+ *
+ * @param temporal the date-time object to convert, not null
+ * @return the ISO local date, not null
+ * @throws DateTimeException if unable to create the date
+ */
+ @Override // override with covariant return type
+ public LocalDate date(TemporalAccessor temporal) {
+ return LocalDate.from(temporal);
+ }
+
+ /**
+ * Obtains an ISO local date-time from another date-time object.
+ *
+ * This is equivalent to {@link LocalDateTime#from(TemporalAccessor)}.
+ *
+ * @param temporal the date-time object to convert, not null
+ * @return the ISO local date-time, not null
+ * @throws DateTimeException if unable to create the date-time
+ */
+ @Override // override with covariant return type
+ public LocalDateTime localDateTime(TemporalAccessor temporal) {
+ return LocalDateTime.from(temporal);
+ }
+
+ /**
+ * Obtains an ISO zoned date-time from another date-time object.
+ *
+ * This is equivalent to {@link ZonedDateTime#from(TemporalAccessor)}.
+ *
+ * @param temporal the date-time object to convert, not null
+ * @return the ISO zoned date-time, not null
+ * @throws DateTimeException if unable to create the date-time
+ */
+ @Override // override with covariant return type
+ public ZonedDateTime zonedDateTime(TemporalAccessor temporal) {
+ return ZonedDateTime.from(temporal);
+ }
+
+ /**
+ * Obtains an ISO zoned date-time in this chronology from an {@code Instant}.
+ *
+ * This is equivalent to {@link ZonedDateTime#ofInstant(Instant, ZoneId)}.
+ *
+ * @param instant the instant to create the date-time from, not null
+ * @param zone the time-zone, not null
+ * @return the zoned date-time, not null
+ * @throws DateTimeException if the result exceeds the supported range
+ */
+ @Override
+ public ZonedDateTime zonedDateTime(Instant instant, ZoneId zone) {
+ return ZonedDateTime.ofInstant(instant, zone);
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Obtains the current ISO local date from the system clock in the default time-zone.
+ *
+ * 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 ISO local date using the system clock and default time-zone, not null
+ * @throws DateTimeException if unable to create the date
+ */
+ @Override // override with covariant return type
+ public LocalDate dateNow() {
+ return dateNow(Clock.systemDefaultZone());
+ }
+
+ /**
+ * Obtains the current ISO local 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.
+ *
+ * @return the current ISO local date using the system clock, not null
+ * @throws DateTimeException if unable to create the date
+ */
+ @Override // override with covariant return type
+ public LocalDate dateNow(ZoneId zone) {
+ return dateNow(Clock.system(zone));
+ }
+
+ /**
+ * Obtains the current ISO local 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 ISO local date, not null
+ * @throws DateTimeException if unable to create the date
+ */
+ @Override // override with covariant return type
+ public LocalDate dateNow(Clock clock) {
+ Objects.requireNonNull(clock, "clock");
+ return date(LocalDate.now(clock));
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * 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.
+ *
+ * @param prolepticYear the ISO proleptic year to check
+ * @return true if the year is leap, false otherwise
+ */
+ @Override
+ public boolean isLeapYear(long prolepticYear) {
+ return ((prolepticYear & 3) == 0) && ((prolepticYear % 100) != 0 || (prolepticYear % 400) == 0);
+ }
+
+ @Override
+ public int prolepticYear(Era era, int yearOfEra) {
+ if (era instanceof IsoEra == false) {
+ throw new DateTimeException("Era must be IsoEra");
+ }
+ return (era == IsoEra.CE ? yearOfEra : 1 - yearOfEra);
+ }
+
+ @Override
+ public Era eraOf(int eraValue) {
+ return IsoEra.of(eraValue);
+ }
+
+ @Override
+ public List
+ *
Specification for implementors
+ * This class is immutable and thread-safe.
+ *
+ * @since 1.8
+ */
+public final class IsoChronology extends Chronology implements Serializable {
+
+ /**
+ * Singleton instance of the ISO chronology.
+ */
+ public static final IsoChronology INSTANCE = new IsoChronology();
+ /**
+ * The singleton instance for the era BCE - 'Before Current Era'.
+ * The 'ISO' part of the name emphasizes that this differs from the BCE
+ * era in the Gregorian calendar system.
+ * This has the numeric value of {@code 0}.
+ */
+ public static final Era ERA_BCE = IsoEra.BCE;
+ /**
+ * The singleton instance for the era CE - 'Current Era'.
+ * The 'ISO' part of the name emphasizes that this differs from the CE
+ * era in the Gregorian calendar system.
+ * This has the numeric value of {@code 1}.
+ */
+ public static final Era ERA_CE = IsoEra.CE;
+
+ /**
+ * Serialization version.
+ */
+ private static final long serialVersionUID = -1440403870442975015L;
+
+ /**
+ * Restricted constructor.
+ */
+ private IsoChronology() {
+ }
+
+ /**
+ * Resolve singleton.
+ *
+ * @return the singleton instance, not null
+ */
+ private Object readResolve() {
+ return INSTANCE;
+ }
+
+ //-----------------------------------------------------------------------
+ /**
+ * Gets the ID of the chronology - 'ISO'.
+ *