JapaneseChronology
public final class JapaneseChronology
extends AbstractChronology implements Serializable
The Japanese Imperial calendar system.
This chronology defines the rules of the Japanese Imperial calendar system. This calendar system is primarily used in Japan. The Japanese Imperial calendar system is the same as the ISO calendar system apart from the era-based year numbering.
Japan introduced the Gregorian calendar starting with Meiji 6. Only Meiji and later eras are supported; dates before Meiji 6, January 1 are not supported.
The supported ChronoField instances are:
DAY_OF_WEEK DAY_OF_MONTH DAY_OF_YEAR EPOCH_DAY MONTH_OF_YEAR PROLEPTIC_MONTH YEAR_OF_ERA YEAR ERA
Summary
Public methods |
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JapaneseDate | date(int prolepticYear, int month, int dayOfMonth) Obtains a local date in Japanese calendar system from the proleptic-year, month-of-year and day-of-month fields. |
JapaneseDate | date(Era era, int yearOfEra, int month, int dayOfMonth) Obtains a local date in Japanese calendar system from the era, year-of-era, month-of-year and day-of-month fields. |
JapaneseDate | date(TemporalAccessor temporal) |
JapaneseDate | dateEpochDay(long epochDay) Obtains a local date in the Japanese calendar system from the epoch-day. |
JapaneseDate | dateNow(ZoneId zone) |
JapaneseDate | dateNow() |
JapaneseDate | dateNow(Clock clock) |
JapaneseDate | dateYearDay(Era era, int yearOfEra, int dayOfYear) Obtains a local date in Japanese calendar system from the era, year-of-era and day-of-year fields. |
JapaneseDate | dateYearDay(int prolepticYear, int dayOfYear) Obtains a local date in Japanese calendar system from the proleptic-year and day-of-year fields. |
JapaneseEra | eraOf(int eraValue) Returns the calendar system era object from the given numeric value. |
List<Era> | eras() |
String | getCalendarType() Gets the calendar type of the underlying calendar system - 'japanese'. |
String | getId() Gets the ID of the chronology - 'Japanese'. |
boolean | isLeapYear(long prolepticYear) Checks if the specified year is a leap year. |
ChronoLocalDateTime<JapaneseDate> | localDateTime(TemporalAccessor temporal) |
int | prolepticYear(Era era, int yearOfEra) |
ValueRange | range(ChronoField field) |
JapaneseDate | resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) Resolves parsed ChronoField values into a date during parsing. |
ChronoZonedDateTime<JapaneseDate> | zonedDateTime(TemporalAccessor temporal) |
ChronoZonedDateTime<JapaneseDate> | zonedDateTime(Instant instant, ZoneId zone) |
Inherited methods |
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From class java.lang.Object Object | clone() Creates and returns a copy of this object. | boolean | equals(Object obj) Indicates whether some other object is "equal to" this one. | void | finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | final Class<?> | getClass() Returns the runtime class of this Object. | int | hashCode() Returns a hash code value for the object. | final void | notify() Wakes up a single thread that is waiting on this object's monitor. | final void | notifyAll() Wakes up all threads that are waiting on this object's monitor. | String | toString() Returns a string representation of the object. | final void | wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. | final void | wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. | final void | wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted. | |
From interface java.time.chrono.Chronology abstract int | compareTo(Chronology other) Compares this chronology to another chronology. | default ChronoLocalDate | date(Era era, int yearOfEra, int month, int dayOfMonth) Obtains a local date in this chronology from the era, year-of-era, month-of-year and day-of-month fields. | abstract ChronoLocalDate | date(int prolepticYear, int month, int dayOfMonth) Obtains a local date in this chronology from the proleptic-year, month-of-year and day-of-month fields. | abstract ChronoLocalDate | date(TemporalAccessor temporal) Obtains a local date in this chronology from another temporal object. | abstract ChronoLocalDate | dateEpochDay(long epochDay) Obtains a local date in this chronology from the epoch-day. | default ChronoLocalDate | dateNow(Clock clock) Obtains the current local date in this chronology from the specified clock. | default ChronoLocalDate | dateNow(ZoneId zone) Obtains the current local date in this chronology from the system clock in the specified time-zone. | default ChronoLocalDate | dateNow() Obtains the current local date in this chronology from the system clock in the default time-zone. | default ChronoLocalDate | dateYearDay(Era era, int yearOfEra, int dayOfYear) Obtains a local date in this chronology from the era, year-of-era and day-of-year fields. | abstract ChronoLocalDate | dateYearDay(int prolepticYear, int dayOfYear) Obtains a local date in this chronology from the proleptic-year and day-of-year fields. | default long | epochSecond(int prolepticYear, int month, int dayOfMonth, int hour, int minute, int second, ZoneOffset zoneOffset) Gets the number of seconds from the epoch of 1970-01-01T00:00:00Z. | default long | epochSecond(Era era, int yearOfEra, int month, int dayOfMonth, int hour, int minute, int second, ZoneOffset zoneOffset) Gets the number of seconds from the epoch of 1970-01-01T00:00:00Z. | abstract boolean | equals(Object obj) Checks if this chronology is equal to another chronology. | abstract Era | eraOf(int eraValue) Creates the chronology era object from the numeric value. | abstract List<Era> | eras() Gets the list of eras for the chronology. | static Chronology | from(TemporalAccessor temporal) Obtains an instance of Chronology from a temporal object. | static Set<Chronology> | getAvailableChronologies() Returns the available chronologies. | abstract String | getCalendarType() Gets the calendar type of the calendar system. | default String | getDisplayName(TextStyle style, Locale locale) Gets the textual representation of this chronology. | abstract String | getId() Gets the ID of the chronology. | abstract int | hashCode() A hash code for this chronology. | abstract boolean | isLeapYear(long prolepticYear) Checks if the specified year is a leap year. | default ChronoLocalDateTime<? extends ChronoLocalDate> | localDateTime(TemporalAccessor temporal) Obtains a local date-time in this chronology from another temporal object. | static Chronology | of(String id) Obtains an instance of Chronology from a chronology ID or calendar system type. | static Chronology | ofLocale(Locale locale) Obtains an instance of Chronology from a locale. | default ChronoPeriod | period(int years, int months, int days) Obtains a period for this chronology based on years, months and days. | abstract int | prolepticYear(Era era, int yearOfEra) Calculates the proleptic-year given the era and year-of-era. | abstract ValueRange | range(ChronoField field) Gets the range of valid values for the specified field. | abstract ChronoLocalDate | resolveDate(Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle) Resolves parsed ChronoField values into a date during parsing. | abstract String | toString() Outputs this chronology as a String. | default ChronoZonedDateTime<? extends ChronoLocalDate> | zonedDateTime(Instant instant, ZoneId zone) Obtains a ChronoZonedDateTime in this chronology from an Instant. | default ChronoZonedDateTime<? extends ChronoLocalDate> | zonedDateTime(TemporalAccessor temporal) Obtains a ChronoZonedDateTime in this chronology from another temporal object. | |
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Fields
INSTANCE
public static final JapaneseChronology INSTANCE
Singleton instance for Japanese chronology.
Public methods
date
public JapaneseDate date (int prolepticYear, int month, int dayOfMonth)
Obtains a local date in Japanese calendar system from the proleptic-year, month-of-year and day-of-month fields.
The Japanese proleptic year, month and day-of-month are the same as those in the ISO calendar system. They are not reset when the era changes.
| Parameters |
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prolepticYear | int: the proleptic-year |
month | int: the month-of-year |
dayOfMonth | int: the day-of-month |
date
public JapaneseDate date (Era era, int yearOfEra, int month, int dayOfMonth)
Obtains a local date in Japanese calendar system from the era, year-of-era, month-of-year and day-of-month fields.
The Japanese month and day-of-month are the same as those in the ISO calendar system. They are not reset when the era changes. For example:
6th Jan Showa 64 = ISO 1989-01-06 7th Jan Showa 64 = ISO 1989-01-07 8th Jan Heisei 1 = ISO 1989-01-08 9th Jan Heisei 1 = ISO 1989-01-09
| Parameters |
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era | Era: the Japanese era, not null |
yearOfEra | int: the year-of-era |
month | int: the month-of-year |
dayOfMonth | int: the day-of-month |
dateEpochDay
public JapaneseDate dateEpochDay (long epochDay)
Obtains a local date in the Japanese calendar system from the epoch-day.
| Parameters |
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epochDay | long: the epoch day |
dateYearDay
public JapaneseDate dateYearDay (Era era, int yearOfEra, int dayOfYear)
Obtains a local date in Japanese calendar system from the era, year-of-era and day-of-year fields.
The day-of-year in this factory is expressed relative to the start of the year-of-era. This definition changes the normal meaning of day-of-year only in those years where the year-of-era is reset to one due to a change in the era. For example:
6th Jan Showa 64 = day-of-year 6 7th Jan Showa 64 = day-of-year 7 8th Jan Heisei 1 = day-of-year 1 9th Jan Heisei 1 = day-of-year 2
| Parameters |
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era | Era: the Japanese era, not null |
yearOfEra | int: the year-of-era |
dayOfYear | int: the day-of-year |
dateYearDay
public JapaneseDate dateYearDay (int prolepticYear, int dayOfYear)
Obtains a local date in Japanese calendar system from the proleptic-year and day-of-year fields.
The day-of-year in this factory is expressed relative to the start of the proleptic year. The Japanese proleptic year and day-of-year are the same as those in the ISO calendar system. They are not reset when the era changes.
| Parameters |
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prolepticYear | int: the proleptic-year |
dayOfYear | int: the day-of-year |
eraOf
public JapaneseEra eraOf (int eraValue)
Returns the calendar system era object from the given numeric value. The numeric values supported by this method are the same as the numeric values supported by JapaneseEra.of(int).
| Parameters |
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eraValue | int: the era value |
| Returns |
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JapaneseEra | the Japanese Era for the given numeric era value |
getCalendarType
public String getCalendarType ()
Gets the calendar type of the underlying calendar system - 'japanese'.
The calendar type is an identifier defined by the Unicode Locale Data Markup Language (LDML) specification. It can be used to lookup the Chronology using Chronology.of(String). It can also be used as part of a locale, accessible via Locale.getUnicodeLocaleType(String) with the key 'ca'.
| Returns |
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String | the calendar system type - 'japanese' |
getId
public String getId ()
Gets the ID of the chronology - 'Japanese'.
The ID uniquely identifies the Chronology. It can be used to lookup the Chronology using Chronology.of(String).
| Returns |
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String | the chronology ID - 'Japanese' |
isLeapYear
public boolean isLeapYear (long prolepticYear)
Checks if the specified year is a leap year.
Japanese calendar leap years occur exactly in line with ISO leap years. This method does not validate the year passed in, and only has a well-defined result for years in the supported range.
| Parameters |
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prolepticYear | long: the proleptic-year to check, not validated for range |
| Returns |
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boolean | true if the year is a leap year |
prolepticYear
public int prolepticYear (Era era, int yearOfEra)
| Parameters |
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era | Era |
yearOfEra | int |
public JapaneseDate resolveDate (Map<TemporalField, Long> fieldValues, ResolverStyle resolverStyle)
Resolves parsed ChronoField values into a date during parsing.
Most TemporalField implementations are resolved using the resolve method on the field. By contrast, the ChronoField class defines fields that only have meaning relative to the chronology. As such, ChronoField date fields are resolved here in the context of a specific chronology.
ChronoField instances are resolved by this method, which may be overridden in subclasses.
EPOCH_DAY - If present, this is converted to a date and all other date fields are then cross-checked against the date. PROLEPTIC_MONTH - If present, then it is split into the YEAR and MONTH_OF_YEAR. If the mode is strict or smart then the field is validated. YEAR_OF_ERA and ERA - If both are present, then they are combined to form a YEAR. In lenient mode, the YEAR_OF_ERA range is not validated, in smart and strict mode it is. The ERA is validated for range in all three modes. If only the YEAR_OF_ERA is present, and the mode is smart or lenient, then the last available era is assumed. In strict mode, no era is assumed and the YEAR_OF_ERA is left untouched. If only the ERA is present, then it is left untouched. YEAR, MONTH_OF_YEAR and DAY_OF_MONTH - If all three are present, then they are combined to form a date. In all three modes, the YEAR is validated. If the mode is smart or strict, then the month and day are validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the first month in the requested year, then adding the difference in months, then the difference in days. If the mode is smart, and the day-of-month is greater than the maximum for the year-month, then the day-of-month is adjusted to the last day-of-month. If the mode is strict, then the three fields must form a valid date. YEAR and DAY_OF_YEAR - If both are present, then they are combined to form a date. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the requested year, then adding the difference in days. If the mode is smart or strict, then the two fields must form a valid date. YEAR, MONTH_OF_YEAR, ALIGNED_WEEK_OF_MONTH and ALIGNED_DAY_OF_WEEK_IN_MONTH - If all four are present, then they are combined to form a date. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the first month in the requested year, then adding the difference in months, then the difference in weeks, then in days. If the mode is smart or strict, then the all four fields are validated to their outer ranges. The date is then combined in a manner equivalent to creating a date on the first day of the requested year and month, then adding the amount in weeks and days to reach their values. If the mode is strict, the date is additionally validated to check that the day and week adjustment did not change the month. YEAR, MONTH_OF_YEAR, ALIGNED_WEEK_OF_MONTH and DAY_OF_WEEK - If all four are present, then they are combined to form a date. The approach is the same as described above for years, months and weeks in ALIGNED_DAY_OF_WEEK_IN_MONTH. The day-of-week is adjusted as the next or same matching day-of-week once the years, months and weeks have been handled. YEAR, ALIGNED_WEEK_OF_YEAR and ALIGNED_DAY_OF_WEEK_IN_YEAR - If all three are present, then they are combined to form a date. In all three modes, the YEAR is validated. If the mode is lenient, then the date is combined in a manner equivalent to creating a date on the first day of the requested year, then adding the difference in weeks, then in days. If the mode is smart or strict, then the all three fields are validated to their outer ranges. The date is then combined in a manner equivalent to creating a date on the first day of the requested year, then adding the amount in weeks and days to reach their values. If the mode is strict, the date is additionally validated to check that the day and week adjustment did not change the year. YEAR, ALIGNED_WEEK_OF_YEAR and DAY_OF_WEEK - If all three are present, then they are combined to form a date. The approach is the same as described above for years and weeks in ALIGNED_DAY_OF_WEEK_IN_YEAR. The day-of-week is adjusted as the next or same matching day-of-week once the years and weeks have been handled.
The default implementation is suitable for most calendar systems. If ChronoField.YEAR_OF_ERA is found without an ChronoField.ERA then the last era in Chronology.eras() is used. The implementation assumes a 7 day week, that the first day-of-month has the value 1, that first day-of-year has the value 1, and that the first of the month and year always exists.
| Parameters |
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fieldValues | Map: the map of fields to values, which can be updated, not null |
resolverStyle | ResolverStyle: the requested type of resolve, not null |
| Returns |
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JapaneseDate | the resolved date, null if insufficient information to create a date |
