public final class HijrahChronology extends AbstractChronology implements Serializable
The HijrahChronology follows the rules of the Hijrah calendar system. The Hijrah calendar has several variants based on differences in when the new moon is determined to have occurred and where the observation is made. In some variants the length of each month is computed algorithmically from the astronomical data for the moon and earth and in others the length of the month is determined by an authorized sighting of the new moon. For the algorithmically based calendars the calendar can project into the future. For sighting based calendars only historical data from past sightings is available.
The length of each month is 29 or 30 days. Ordinary years have 354 days; leap years have 355 days.
CLDR and LDML identify variants:
| Chronology ID | Calendar Type | Locale extension, see Locale |
Description |
|---|---|---|---|
| Hijrah-umalqura | islamic-umalqura | ca-islamic-umalqura | Islamic - Umm Al-Qura calendar of Saudi Arabia |
Additional variants may be available through Chronology.getAvailableChronologies().
Example
Selecting the chronology from the locale uses Chronology.ofLocale(java.util.Locale)
to find the Chronology based on Locale supported BCP 47 extension mechanism
to request a specific calendar ("ca"). For example,
Locale locale = Locale.forLanguageTag("en-US-u-ca-islamic-umalqura");
Chronology chrono = Chronology.ofLocale(locale);
ID, the calendar type,
the start of the calendar, the alignment with the
ISO calendar, and the length of each month for a range of years.
The variants are identified in the calendars.properties file.
The new properties are prefixed with "calendars.hijrah.":
| Property Name | Property value | Description |
|---|---|---|
| calendars.hijrah.{ID} | The property resource defining the {ID} variant |
The property resource is located with the calendars.properties file |
| calendars.hijrah.{ID}.type | The calendar type | LDML defines the calendar type names |
The Hijrah property resource is a set of properties that describe the calendar.
The syntax is defined by java.util.Properties#load(Reader).
| Property Name | Property value | Description |
|---|---|---|
| id | Chronology Id, for example, "Hijrah-umalqura" | The Id of the calendar in common usage |
| type | Calendar type, for example, "islamic-umalqura" | LDML defines the calendar types |
| version | Version, for example: "1.8.0_1" | The version of the Hijrah variant data |
| iso-start | ISO start date, formatted as yyyy-MM-dd, for example: "1900-04-30" |
The ISO date of the first day of the minimum Hijrah year. |
| yyyy - a numeric 4 digit year, for example "1434" | The value is a sequence of 12 month lengths, for example: "29 30 29 30 29 30 30 30 29 30 29 29" | The lengths of the 12 months of the year separated by whitespace. A numeric year property must be present for every year without any gaps. The month lengths must be between 29-32 inclusive. |
| Modifier and Type | Field and Description |
|---|---|
static HijrahChronology |
INSTANCE
Singleton instance of the Islamic Umm Al-Qura calendar of Saudi Arabia.
|
| Modifier and Type | Method and Description |
|---|---|
HijrahDate |
date(Era era,
int yearOfEra,
int month,
int dayOfMonth)
Obtains a local date in Hijrah calendar system from the
era, year-of-era, month-of-year and day-of-month fields.
|
HijrahDate |
date(int prolepticYear,
int month,
int dayOfMonth)
Obtains a local date in Hijrah calendar system from the
proleptic-year, month-of-year and day-of-month fields.
|
HijrahDate |
date(TemporalAccessor temporal)
Obtains a local date in this chronology from another temporal object.
|
HijrahDate |
dateEpochDay(long epochDay)
Obtains a local date in the Hijrah calendar system from the epoch-day.
|
HijrahDate |
dateNow()
Obtains the current local date in this chronology from the system clock in the default time-zone.
|
HijrahDate |
dateNow(Clock clock)
Obtains the current local date in this chronology from the specified clock.
|
HijrahDate |
dateNow(ZoneId zone)
Obtains the current local date in this chronology from the system clock in the specified time-zone.
|
HijrahDate |
dateYearDay(Era era,
int yearOfEra,
int dayOfYear)
Obtains a local date in Hijrah calendar system from the
era, year-of-era and day-of-year fields.
|
HijrahDate |
dateYearDay(int prolepticYear,
int dayOfYear)
Obtains a local date in Hijrah calendar system from the
proleptic-year and day-of-year fields.
|
HijrahEra |
eraOf(int eraValue)
Creates the chronology era object from the numeric value.
|
List<Era> |
eras()
Gets the list of eras for the chronology.
|
String |
getCalendarType()
Gets the calendar type of the Islamic calendar.
|
String |
getId()
Gets the ID of the chronology.
|
boolean |
isLeapYear(long prolepticYear)
Checks if the specified year is a leap year.
|
ChronoLocalDateTime<HijrahDate> |
localDateTime(TemporalAccessor temporal)
Obtains a local date-time in this chronology from another temporal object.
|
int |
prolepticYear(Era era,
int yearOfEra)
Calculates the proleptic-year given the era and year-of-era.
|
ValueRange |
range(ChronoField field)
Gets the range of valid values for the specified field.
|
HijrahDate |
resolveDate(Map<TemporalField,Long> fieldValues,
ResolverStyle resolverStyle)
Resolves parsed
ChronoField values into a date during parsing. |
ChronoZonedDateTime<HijrahDate> |
zonedDateTime(Instant instant,
ZoneId zone)
Obtains a
ChronoZonedDateTime in this chronology from an Instant. |
ChronoZonedDateTime<HijrahDate> |
zonedDateTime(TemporalAccessor temporal)
Obtains a
ChronoZonedDateTime in this chronology from another temporal object. |
compareTo, equals, hashCode, toStringclone, finalize, getClass, notify, notifyAll, wait, wait, waitfrom, getDisplayName, periodpublic static final HijrahChronology INSTANCE
Chronology.getAvailableChronologies().public String getId()
The ID uniquely identifies the Chronology. It can be used to
lookup the Chronology using Chronology.of(String).
getId in interface ChronologygetCalendarType()public String getCalendarType()
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).
getCalendarType in interface ChronologygetId()public HijrahDate date(Era era, int yearOfEra, int month, int dayOfMonth)
date in interface Chronologyera - the Hijrah era, not nullyearOfEra - the year-of-eramonth - the month-of-yeardayOfMonth - the day-of-monthDateTimeException - if unable to create the dateClassCastException - if the era is not a HijrahErapublic HijrahDate date(int prolepticYear, int month, int dayOfMonth)
date in interface ChronologyprolepticYear - the proleptic-yearmonth - the month-of-yeardayOfMonth - the day-of-monthDateTimeException - if unable to create the datepublic HijrahDate dateYearDay(Era era, int yearOfEra, int dayOfYear)
dateYearDay in interface Chronologyera - the Hijrah era, not nullyearOfEra - the year-of-eradayOfYear - the day-of-yearDateTimeException - if unable to create the dateClassCastException - if the era is not a HijrahErapublic HijrahDate dateYearDay(int prolepticYear, int dayOfYear)
dateYearDay in interface ChronologyprolepticYear - the proleptic-yeardayOfYear - the day-of-yearDateTimeException - if the value of the year is out of range,
or if the day-of-year is invalid for the yearpublic HijrahDate dateEpochDay(long epochDay)
dateEpochDay in interface ChronologyepochDay - the epoch dayDateTimeException - if unable to create the datepublic HijrahDate dateNow()
Chronology
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.
dateNow in interface Chronologypublic HijrahDate dateNow(ZoneId zone)
Chronology
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.
dateNow in interface Chronologyzone - the zone ID to use, not nullpublic HijrahDate dateNow(Clock clock)
Chronology
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.
dateNow in interface Chronologyclock - the clock to use, not nullpublic HijrahDate date(TemporalAccessor temporal)
Chronology
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.
date in interface Chronologytemporal - the temporal object to convert, not nullChronoLocalDate.from(TemporalAccessor)public ChronoLocalDateTime<HijrahDate> localDateTime(TemporalAccessor temporal)
Chronology
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.
localDateTime in interface Chronologytemporal - the temporal object to convert, not nullChronoLocalDateTime.from(TemporalAccessor)public ChronoZonedDateTime<HijrahDate> zonedDateTime(TemporalAccessor temporal)
ChronologyChronoZonedDateTime 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.
zonedDateTime in interface Chronologytemporal - the temporal object to convert, not nullChronoZonedDateTime.from(TemporalAccessor)public ChronoZonedDateTime<HijrahDate> zonedDateTime(Instant instant, ZoneId zone)
ChronologyChronoZonedDateTime in this chronology from an Instant.
This obtains a zoned date-time with the same instant as that specified.
zonedDateTime in interface Chronologyinstant - the instant to create the date-time from, not nullzone - the time-zone, not nullpublic boolean isLeapYear(long prolepticYear)
ChronologyA leap-year is a year of a longer length than normal. The exact meaning is determined by the chronology according to the following constraints.
isLeapYear in interface ChronologyprolepticYear - the proleptic-year to check, not validated for rangepublic int prolepticYear(Era era, int yearOfEra)
ChronologyThis 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.
prolepticYear in interface Chronologyera - the era of the correct type for the chronology, not nullyearOfEra - the chronology year-of-erapublic HijrahEra eraOf(int eraValue)
ChronologyThe 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.
eraOf in interface ChronologyeraValue - the era valuepublic List<Era> eras()
ChronologyMost 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.
eras in interface Chronologypublic ValueRange range(ChronoField field)
Chronology
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.
range in interface Chronologyfield - the field to get the range for, not nullpublic HijrahDate resolveDate(Map<TemporalField,Long> fieldValues, ResolverStyle resolverStyle)
AbstractChronologyChronoField 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.
resolveDate in interface ChronologyresolveDate in class AbstractChronologyfieldValues - the map of fields to values, which can be updated, not nullresolverStyle - the requested type of resolve, not null Submit a bug or feature
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