JapaneseChronology
class JapaneseChronology : AbstractChronology, 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
| Inherited functions |
From class AbstractChronology
Int |
compareTo(other: Chronology!)
Compares this chronology to another chronology.
The comparison order first by the chronology ID string, then by any additional information specific to the subclass. It is "consistent with equals", as defined by Comparable.
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Boolean |
equals(other: Any?)
Checks if this chronology is equal to another chronology.
The comparison is based on the entire state of the object.
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Int |
hashCode()
A hash code for this chronology.
The hash code should be based on the entire state of the object.
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String |
toString()
Outputs this chronology as a String, using the chronology ID.
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From class Chronology
ChronoLocalDate! |
date(era: Era!, yearOfEra: Int, month: Int, dayOfMonth: Int)
Obtains a local date in this chronology from the era, year-of-era, month-of-year and day-of-month fields.
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ChronoLocalDate! |
date(prolepticYear: Int, month: Int, dayOfMonth: Int)
Obtains a local date in this chronology from the proleptic-year, month-of-year and day-of-month fields.
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ChronoLocalDate! |
date(temporal: TemporalAccessor!)
Obtains a local date in this chronology from another temporal object.
This obtains a date in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoLocalDate.
The conversion typically uses the EPOCH_DAY field, which is standardized across calendar systems.
This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::date.
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ChronoLocalDate! |
dateEpochDay(epochDay: Long)
Obtains a local date in this chronology from the epoch-day.
The definition of EPOCH_DAY is the same for all calendar systems, thus it can be used for conversion.
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ChronoLocalDate! |
dateNow()
Obtains the current local date in this chronology from the system clock in the default time-zone.
This will query the 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.
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ChronoLocalDate! |
dateNow(zone: ZoneId!)
Obtains the current local date in this chronology from the system clock in the specified time-zone.
This will query the 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.
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ChronoLocalDate! |
dateNow(clock: Clock!)
Obtains the current local date in this chronology 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 dependency injection.
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ChronoLocalDate! |
dateYearDay(era: Era!, yearOfEra: Int, dayOfYear: Int)
Obtains a local date in this chronology from the era, year-of-era and day-of-year fields.
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ChronoLocalDate! |
dateYearDay(prolepticYear: Int, dayOfYear: Int)
Obtains a local date in this chronology from the proleptic-year and day-of-year fields.
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Long |
epochSecond(prolepticYear: Int, month: Int, dayOfMonth: Int, hour: Int, minute: Int, second: Int, zoneOffset: ZoneOffset!)
Gets the number of seconds from the epoch of 1970-01-01T00:00:00Z.
The number of seconds is calculated using the proleptic-year, month, day-of-month, hour, minute, second, and zoneOffset.
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Long |
epochSecond(era: Era!, yearOfEra: Int, month: Int, dayOfMonth: Int, hour: Int, minute: Int, second: Int, zoneOffset: ZoneOffset!)
Gets the number of seconds from the epoch of 1970-01-01T00:00:00Z.
The number of seconds is calculated using the era, year-of-era, month, day-of-month, hour, minute, second, and zoneOffset.
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Era! |
eraOf(eraValue: Int)
Creates the chronology era object from the numeric value.
The era is, conceptually, the largest division of the time-line. Most calendar systems have a single epoch dividing the time-line into two eras. However, some have multiple eras, such as one for the reign of each leader. The exact meaning is determined by the chronology according to the following constraints.
The era in use at 1970-01-01 must have the value 1. Later eras must have sequentially higher values. Earlier eras must have sequentially lower values. Each chronology must refer to an enum or similar singleton to provide the era values.
This method returns the singleton era of the correct type for the specified era value.
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MutableList<Era!>! |
eras()
Gets the list of eras for the chronology.
Most calendar systems have an era, within which the year has meaning. If the calendar system does not support the concept of eras, an empty list must be returned.
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String! |
getCalendarType()
Gets the calendar type of the calendar system.
The calendar type is an identifier defined by the CLDR and Unicode Locale Data Markup Language (LDML) specifications to uniquely identify a calendar. The getCalendarType is the concatenation of the CLDR calendar type and the variant, if applicable, is appended separated by "-". The calendar type is used to lookup the Chronology using of(java.lang.String).
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String! |
getDisplayName(style: TextStyle!, locale: Locale!)
Gets the textual representation of this chronology.
This returns the textual name used to identify the chronology, suitable for presentation to the user. The parameters control the style of the returned text and the locale.
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String! |
getId()
Gets the ID of the chronology.
The ID uniquely identifies the Chronology. It can be used to lookup the Chronology using of(java.lang.String).
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Boolean |
isLeapYear(prolepticYear: Long)
Checks if the specified year is a leap year.
A leap-year is a year of a longer length than normal. The exact meaning is determined by the chronology according to the following constraints.
- a leap-year must imply a year-length longer than a non leap-year.
- a chronology that does not support the concept of a year must return false.
- the correct result must be returned for all years within the valid range of years for the chronology.
Outside the range of valid years an implementation is free to return either a best guess or false. An implementation must not throw an exception, even if the year is outside the range of valid years.
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ChronoLocalDateTime<out ChronoLocalDate!>! |
localDateTime(temporal: TemporalAccessor!)
Obtains a local date-time in this chronology from another temporal object.
This obtains a date-time in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoLocalDateTime.
The conversion extracts and combines the ChronoLocalDate and the LocalTime from the temporal object. Implementations are permitted to perform optimizations such as accessing those fields that are equivalent to the relevant objects. The result uses this chronology.
This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::localDateTime.
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ChronoPeriod! |
period(years: Int, months: Int, days: Int)
Obtains a period for this chronology based on years, months and days.
This returns a period tied to this chronology using the specified years, months and days. All supplied chronologies use periods based on years, months and days, however the ChronoPeriod API allows the period to be represented using other units.
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Int |
prolepticYear(era: Era!, yearOfEra: Int)
Calculates the proleptic-year given the era and year-of-era.
This combines the era and year-of-era into the single proleptic-year field.
If the chronology makes active use of eras, such as JapaneseChronology then the year-of-era will be validated against the era. For other chronologies, validation is optional.
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ValueRange! |
range(field: ChronoField!)
Gets the range of valid values for the specified field.
All fields can be expressed as a long integer. This method returns an object that describes the valid range for that value.
Note that the result only describes the minimum and maximum valid values and it is important not to read too much into them. For example, there could be values within the range that are invalid for the field.
This method will return a result whether or not the chronology supports the field.
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ChronoZonedDateTime<out ChronoLocalDate!>! |
zonedDateTime(temporal: TemporalAccessor!)
Obtains a ChronoZonedDateTime in this chronology from another temporal object.
This obtains a zoned date-time in this chronology based on the specified temporal. A TemporalAccessor represents an arbitrary set of date and time information, which this factory converts to an instance of ChronoZonedDateTime.
The conversion will first obtain a ZoneId from the temporal object, falling back to a ZoneOffset if necessary. It will then try to obtain an Instant, falling back to a ChronoLocalDateTime if necessary. The result will be either the combination of ZoneId or ZoneOffset with Instant or ChronoLocalDateTime. Implementations are permitted to perform optimizations such as accessing those fields that are equivalent to the relevant objects. The result uses this chronology.
This method matches the signature of the functional interface TemporalQuery allowing it to be used as a query via method reference, aChronology::zonedDateTime.
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ChronoZonedDateTime<out ChronoLocalDate!>! |
zonedDateTime(instant: Instant!, zone: ZoneId!)
Obtains a ChronoZonedDateTime in this chronology from an Instant.
This obtains a zoned date-time with the same instant as that specified.
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Public methods
date
fun date(
era: Era!,
yearOfEra: Int,
month: Int,
dayOfMonth: Int
): JapaneseDate!
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 |
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 |
| Exceptions |
java.time.DateTimeException |
if unable to create the date |
java.lang.ClassCastException |
if the era is not a JapaneseEra |
date
fun date(
prolepticYear: Int,
month: Int,
dayOfMonth: Int
): JapaneseDate!
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 |
prolepticYear |
Int: the proleptic-year |
month |
Int: the month-of-year |
dayOfMonth |
Int: the day-of-month |
| Exceptions |
java.time.DateTimeException |
if unable to create the date |
dateEpochDay
fun dateEpochDay(epochDay: Long): JapaneseDate!
Obtains a local date in the Japanese calendar system from the epoch-day.
| Parameters |
epochDay |
Long: the epoch day |
| Exceptions |
java.time.DateTimeException |
if unable to create the date |
dateNow
fun dateNow(): JapaneseDate!
| Return |
JapaneseDate! |
the current local date using the system clock and default time-zone, not null |
| Exceptions |
java.time.DateTimeException |
if unable to create the date |
dateNow
fun dateNow(zone: ZoneId!): JapaneseDate!
| Parameters |
zone |
ZoneId!: the zone ID to use, not null |
| Return |
JapaneseDate! |
the current local date using the system clock, not null |
| Exceptions |
java.time.DateTimeException |
if unable to create the date |
dateNow
fun dateNow(clock: Clock!): JapaneseDate!
| Parameters |
clock |
Clock!: the clock to use, not null |
| Exceptions |
java.time.DateTimeException |
if unable to create the date |
dateYearDay
fun dateYearDay(
era: Era!,
yearOfEra: Int,
dayOfYear: Int
): JapaneseDate!
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 |
era |
Era!: the Japanese era, not null |
yearOfEra |
Int: the year-of-era |
dayOfYear |
Int: the day-of-year |
| Exceptions |
java.time.DateTimeException |
if unable to create the date |
java.lang.ClassCastException |
if the era is not a JapaneseEra |
dateYearDay
fun dateYearDay(
prolepticYear: Int,
dayOfYear: Int
): JapaneseDate!
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 |
prolepticYear |
Int: the proleptic-year |
dayOfYear |
Int: the day-of-year |
| Exceptions |
java.time.DateTimeException |
if unable to create the date |
eraOf
fun eraOf(eraValue: Int): JapaneseEra!
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 |
eraValue |
Int: the era value |
| Return |
JapaneseEra! |
the Japanese Era for the given numeric era value |
| Exceptions |
java.time.DateTimeException |
if eraValue is invalid |
getCalendarType
fun getCalendarType(): String!
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'.
| Return |
String! |
the calendar system type - 'japanese' |
getId
fun getId(): String!
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).
| Return |
String! |
the chronology ID - 'Japanese' |
isLeapYear
fun isLeapYear(prolepticYear: Long): Boolean
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 |
prolepticYear |
Long: the proleptic-year to check, not validated for range |
| Return |
Boolean |
true if the year is a leap year |
prolepticYear
fun prolepticYear(
era: Era!,
yearOfEra: Int
): Int
| Parameters |
era |
Era!: the era of the correct type for the chronology, not null |
yearOfEra |
Int: the chronology year-of-era |
| Return |
Int |
the proleptic-year |
| Exceptions |
java.time.DateTimeException |
if unable to convert to a proleptic-year, such as if the year is invalid for the era |
java.lang.ClassCastException |
if the era is not of the correct type for the chronology |
range
fun range(field: ChronoField!): ValueRange!
| Parameters |
field |
ChronoField!: the field to get the range for, not null |
| Return |
ValueRange! |
the range of valid values for the field, not null |
| Exceptions |
java.time.DateTimeException |
if the range for the field cannot be obtained |
resolveDate
fun resolveDate(
fieldValues: MutableMap<TemporalField!, Long!>!,
resolverStyle: ResolverStyle!
): JapaneseDate!
| Return |
JapaneseDate! |
the resolved date, null if insufficient information to create a date |
| Exceptions |
java.time.DateTimeException |
if the date cannot be resolved, typically because of a conflict in the input data |
zonedDateTime
fun zonedDateTime(
instant: Instant!,
zone: ZoneId!
): ChronoZonedDateTime<JapaneseDate!>!
| Parameters |
instant |
Instant!: the instant to create the date-time from, not null |
zone |
ZoneId!: the time-zone, not null |
| Exceptions |
java.time.DateTimeException |
if the result exceeds the supported range |
Properties
INSTANCE
static val INSTANCE: JapaneseChronology!
Singleton instance for Japanese chronology.
