public final class HijrahDate extends Object implements ChronoLocalDate, Serializable
This date operates using one of several variants of the Hijrah calendar.
The Hijrah calendar has a different total of days in a year than
Gregorian calendar, and the length of each month is based on the period
of a complete revolution of the moon around the earth
(as between successive new moons).
Refer to the HijrahChronology for details of supported variants.
Each HijrahDate is created bound to a particular HijrahChronology,
The same chronology is propagated to each HijrahDate computed from the date.
To use a different Hijrah variant, its HijrahChronology can be used
to create new HijrahDate instances.
Alternatively, the withVariant(java.time.chrono.HijrahChronology) method can be used to convert
to a new HijrahChronology.
This is a value-based
class; use of identity-sensitive operations (including reference equality
(==), identity hash code, or synchronization) on instances of
HijrahDate may have unpredictable results and should be avoided.
The equals method should be used for comparisons.
| Modifier and Type | Method and Description |
|---|---|
ChronoLocalDateTime<HijrahDate> |
atTime(LocalTime localTime)
Combines this date with a time to create a
ChronoLocalDateTime. |
boolean |
equals(Object obj)
Compares this date to another date, including the chronology.
|
static HijrahDate |
from(TemporalAccessor temporal)
Obtains a
HijrahDate of the Islamic Umm Al-Qura calendar from a temporal object. |
HijrahChronology |
getChronology()
Gets the chronology of this date, which is the Hijrah calendar system.
|
HijrahEra |
getEra()
Gets the era applicable at this date.
|
long |
getLong(TemporalField field)
Gets the value of the specified field as a
long. |
int |
hashCode()
A hash code for this date.
|
boolean |
isLeapYear()
Checks if the year is a leap year, according to the Hijrah calendar system rules.
|
int |
lengthOfMonth()
Returns the length of the month represented by this date.
|
int |
lengthOfYear()
Returns the length of the year represented by this date.
|
HijrahDate |
minus(long amountToSubtract,
TemporalUnit unit)
Returns an object of the same type as this object with the specified period subtracted.
|
HijrahDate |
minus(TemporalAmount amount)
Returns an object of the same type as this object with an amount subtracted.
|
static HijrahDate |
now()
Obtains the current
HijrahDate of the Islamic Umm Al-Qura calendar
in the default time-zone. |
static HijrahDate |
now(Clock clock)
Obtains the current
HijrahDate of the Islamic Umm Al-Qura calendar
from the specified clock. |
static HijrahDate |
now(ZoneId zone)
Obtains the current
HijrahDate of the Islamic Umm Al-Qura calendar
in the specified time-zone. |
static HijrahDate |
of(int prolepticYear,
int month,
int dayOfMonth)
Obtains a
HijrahDate of the Islamic Umm Al-Qura calendar
from the proleptic-year, month-of-year and day-of-month fields. |
HijrahDate |
plus(long amountToAdd,
TemporalUnit unit)
Returns an object of the same type as this object with the specified period added.
|
HijrahDate |
plus(TemporalAmount amount)
Returns an object of the same type as this object with an amount added.
|
ValueRange |
range(TemporalField field)
Gets the range of valid values for the specified field.
|
long |
toEpochDay()
Converts this date to the Epoch Day.
|
String |
toString()
Returns a string representation of the object.
|
ChronoPeriod |
until(ChronoLocalDate endDate)
Calculates the period between this date and another date as a
ChronoPeriod. |
long |
until(Temporal endExclusive,
TemporalUnit unit)
Calculates the amount of time until another date in terms of the specified unit.
|
HijrahDate |
with(TemporalAdjuster adjuster)
Returns an adjusted object of the same type as this object with the adjustment made.
|
HijrahDate |
with(TemporalField field,
long newValue)
Returns an object of the same type as this object with the specified field altered.
|
HijrahDate |
withVariant(HijrahChronology chronology)
Returns a
HijrahDate with the Chronology requested. |
clone, finalize, getClass, notify, notifyAll, wait, wait, waitadjustInto, compareTo, format, isAfter, isBefore, isEqual, isSupported, isSupported, query, timeLineOrder, toString, untilgetpublic static HijrahDate now()
HijrahDate of the Islamic Umm Al-Qura calendar
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.
public static HijrahDate now(ZoneId zone)
HijrahDate of the Islamic Umm Al-Qura calendar
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.
zone - the zone ID to use, not nullpublic static HijrahDate now(Clock clock)
HijrahDate of the Islamic Umm Al-Qura calendar
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.
clock - the clock to use, not nullDateTimeException - if the current date cannot be obtainedpublic static HijrahDate of(int prolepticYear, int month, int dayOfMonth)
HijrahDate of the Islamic Umm Al-Qura calendar
from the proleptic-year, month-of-year and day-of-month fields.
This returns a HijrahDate with the specified fields.
The day must be valid for the year and month, otherwise an exception will be thrown.
prolepticYear - the Hijrah proleptic-yearmonth - the Hijrah month-of-year, from 1 to 12dayOfMonth - the Hijrah day-of-month, from 1 to 30DateTimeException - if the value of any field is out of range,
or if the day-of-month is invalid for the month-yearpublic static HijrahDate from(TemporalAccessor temporal)
HijrahDate of the Islamic Umm Al-Qura calendar from a temporal object.
This obtains a date in the Hijrah calendar system based on the specified temporal.
A TemporalAccessor represents an arbitrary set of date and time information,
which this factory converts to an instance of HijrahDate.
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, HijrahDate::from.
from in interface ChronoLocalDatetemporal - the temporal object to convert, not nullDateTimeException - if unable to convert to a HijrahDateChronology.date(TemporalAccessor)public HijrahChronology getChronology()
The Chronology represents the calendar system in use.
The era and other fields in ChronoField are defined by the chronology.
getChronology in interface ChronoLocalDatepublic HijrahEra getEra()
The Hijrah calendar system has one era, 'AH',
defined by HijrahEra.
getEra in interface ChronoLocalDatepublic int lengthOfMonth()
This returns the length of the month in days. Month lengths in the Hijrah calendar system vary between 29 and 30 days.
lengthOfMonth in interface ChronoLocalDatepublic int lengthOfYear()
This returns the length of the year in days. A Hijrah calendar system year is typically shorter than that of the ISO calendar system.
lengthOfYear in interface ChronoLocalDatepublic ValueRange range(TemporalField field)
TemporalAccessor
All fields can be expressed as a long integer.
This method returns an object that describes the valid range for that value.
The value of this temporal object is used to enhance the accuracy of the returned range.
If the date-time cannot return the range, because the field is unsupported or for
some other reason, an exception will be thrown.
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.
range in interface TemporalAccessorfield - the field to query the range for, not nullpublic long getLong(TemporalField field)
TemporalAccessorlong.
This queries the date-time for the value of the specified field. The returned value may be outside the valid range of values for the field. If the date-time cannot return the value, because the field is unsupported or for some other reason, an exception will be thrown.
getLong in interface TemporalAccessorfield - the field to get, not nullpublic HijrahDate with(TemporalField field, long newValue)
ChronoLocalDate
This returns a new object based on this one with the value for the specified field changed.
For example, on a LocalDate, this could be used to set the year, month or day-of-month.
The returned object will have the same observable type as this object.
In some cases, changing a field is not fully defined. For example, if the target object is a date representing the 31st January, then changing the month to February would be unclear. In cases like this, the field is responsible for resolving the result. Typically it will choose the previous valid date, which would be the last valid day of February in this example.
with in interface ChronoLocalDatewith in interface Temporalfield - the field to set in the result, not nullnewValue - the new value of the field in the resultpublic HijrahDate with(TemporalAdjuster adjuster)
This adjusts this date-time according to the rules of the specified adjuster.
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
TemporalAdjusters.
These include finding the "last day of the month" and "next Wednesday".
The adjuster is responsible for handling special cases, such as the varying
lengths of month and leap years.
Some example code indicating how and why this method is used:
date = date.with(Month.JULY); // most key classes implement TemporalAdjuster date = date.with(lastDayOfMonth()); // static import from Adjusters date = date.with(next(WEDNESDAY)); // static import from Adjusters and DayOfWeek
with in interface ChronoLocalDatewith in interface Temporaladjuster - the adjuster to use, not nullDateTimeException - if unable to make the adjustment.
For example, if the adjuster requires an ISO chronologyArithmeticException - if numeric overflow occurspublic HijrahDate withVariant(HijrahChronology chronology)
HijrahDate with the Chronology requested.
The year, month, and day are checked against the new requested HijrahChronology. If the chronology has a shorter month length for the month, the day is reduced to be the last day of the month.
chronology - the new HijrahChonology, non-nullpublic HijrahDate plus(TemporalAmount amount)
This adjusts this temporal, adding according to the rules of the specified amount.
The amount is typically a Period but may be any other type implementing
the TemporalAmount interface, such as Duration.
Some example code indicating how and why this method is used:
date = date.plus(period); // add a Period instance date = date.plus(duration); // add a Duration instance date = date.plus(workingDays(6)); // example user-written workingDays method
Note that calling plus followed by minus is not guaranteed to
return the same date-time.
plus in interface ChronoLocalDateplus in interface Temporalamount - the amount to add, not nullDateTimeException - if the addition cannot be madeArithmeticException - if numeric overflow occurspublic HijrahDate minus(TemporalAmount amount)
This adjusts this temporal, subtracting according to the rules of the specified amount.
The amount is typically a Period but may be any other type implementing
the TemporalAmount interface, such as Duration.
Some example code indicating how and why this method is used:
date = date.minus(period); // subtract a Period instance date = date.minus(duration); // subtract a Duration instance date = date.minus(workingDays(6)); // example user-written workingDays method
Note that calling plus followed by minus is not guaranteed to
return the same date-time.
minus in interface ChronoLocalDateminus in interface Temporalamount - the amount to subtract, not nullDateTimeException - if the subtraction cannot be madeArithmeticException - if numeric overflow occurspublic long toEpochDay()
ChronoLocalDate
The Epoch Day count is a simple
incrementing count of days where day 0 is 1970-01-01 (ISO).
This definition is the same for all chronologies, enabling conversion.
This default implementation queries the EPOCH_DAY field.
toEpochDay in interface ChronoLocalDatepublic boolean isLeapYear()
isLeapYear in interface ChronoLocalDatepublic HijrahDate plus(long amountToAdd, TemporalUnit unit)
ChronoLocalDate
This method returns a new object based on this one with the specified period added.
For example, on a LocalDate, this could be used to add a number of years, months or days.
The returned object will have the same observable type as this object.
In some cases, changing a field is not fully defined. For example, if the target object is a date representing the 31st January, then adding one month would be unclear. In cases like this, the field is responsible for resolving the result. Typically it will choose the previous valid date, which would be the last valid day of February in this example.
plus in interface ChronoLocalDateplus in interface TemporalamountToAdd - the amount of the specified unit to add, may be negativeunit - the unit of the amount to add, not nullpublic HijrahDate minus(long amountToSubtract, TemporalUnit unit)
ChronoLocalDate
This method returns a new object based on this one with the specified period subtracted.
For example, on a LocalDate, this could be used to subtract a number of years, months or days.
The returned object will have the same observable type as this object.
In some cases, changing a field is not fully defined. For example, if the target object is a date representing the 31st March, then subtracting one month would be unclear. In cases like this, the field is responsible for resolving the result. Typically it will choose the previous valid date, which would be the last valid day of February in this example.
minus in interface ChronoLocalDateminus in interface TemporalamountToSubtract - the amount of the specified unit to subtract, may be negativeunit - the unit of the amount to subtract, not nullpublic final ChronoLocalDateTime<HijrahDate> atTime(LocalTime localTime)
ChronoLocalDateChronoLocalDateTime.
This returns a ChronoLocalDateTime formed from this date at the specified time.
All possible combinations of date and time are valid.
atTime in interface ChronoLocalDatelocalTime - the local time to use, not nullpublic ChronoPeriod until(ChronoLocalDate endDate)
ChronoLocalDateChronoPeriod.
This calculates the period between two dates. All supplied chronologies
calculate the period using years, months and days, however the
ChronoPeriod API allows the period to be represented using other units.
The start and end points are this and the specified date.
The result will be negative if the end is before the start.
The negative sign will be the same in each of year, month and day.
The calculation is performed using the chronology of this date. If necessary, the input date will be converted to match.
This instance is immutable and unaffected by this method call.
until in interface ChronoLocalDateendDate - the end date, exclusive, which may be in any chronology, not nullpublic boolean equals(Object obj)
Compares this HijrahDate with another ensuring that the date is the same.
Only objects of type HijrahDate are compared, other types return false.
To compare the dates of two TemporalAccessor instances, including dates
in two different chronologies, use ChronoField.EPOCH_DAY as a comparator.
equals in interface ChronoLocalDateobj - the object to check, null returns falseObject.hashCode(),
HashMappublic int hashCode()
hashCode in interface ChronoLocalDateObject.equals(java.lang.Object),
System.identityHashCode(java.lang.Object)public long until(Temporal endExclusive, TemporalUnit unit)
ChronoLocalDate
This calculates the amount of time between two ChronoLocalDate
objects in terms of a single TemporalUnit.
The start and end points are this and the specified date.
The result will be negative if the end is before the start.
The Temporal passed to this method is converted to a
ChronoLocalDate using Chronology.date(TemporalAccessor).
The calculation returns a whole number, representing the number of
complete units between the two dates.
For example, the amount in days between two dates can be calculated
using startDate.until(endDate, DAYS).
There are two equivalent ways of using this method.
The first is to invoke this method.
The second is to use TemporalUnit.between(Temporal, Temporal):
// these two lines are equivalent amount = start.until(end, MONTHS); amount = MONTHS.between(start, end);The choice should be made based on which makes the code more readable.
The calculation is implemented in this method for ChronoUnit.
The units DAYS, WEEKS, MONTHS, YEARS,
DECADES, CENTURIES, MILLENNIA and ERAS
should be supported by all implementations.
Other ChronoUnit values will throw an exception.
If the unit is not a ChronoUnit, then the result of this method
is obtained by invoking TemporalUnit.between(Temporal, Temporal)
passing this as the first argument and the converted input temporal as
the second argument.
This instance is immutable and unaffected by this method call.
until in interface ChronoLocalDateuntil in interface TemporalendExclusive - the end date, exclusive, which is converted to a
ChronoLocalDate in the same chronology, not nullunit - the unit to measure the amount in, not nullpublic String toString()
ObjecttoString method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `@', and
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
toString in interface ChronoLocalDatetoString in class ObjectDracula Javadoc Sample, Made with Allan Im.