public static HijrahDate now()

Obtains the current 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)

Obtains the current 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.

public static HijrahDate now​(Clock clock)

Obtains the current 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.

public 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.

This returns a HijrahDate with the specified fields. The day must be valid for the year and month, otherwise an exception will be thrown.

public static HijrahDate from​(TemporalAccessor temporal)

Obtains a 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.

public HijrahChronology getChronology()

Gets the chronology of this date, which is the Hijrah calendar system.

The Chronology represents the calendar system in use. The era and other fields in ChronoField are defined by the chronology.

public HijrahEra getEra()

Gets the era applicable at this date.

The Hijrah calendar system has one era, 'AH', defined by HijrahEra.

public int lengthOfMonth()

Returns the length of the month represented by this date.

This returns the length of the month in days. Month lengths in the Hijrah calendar system vary between 29 and 30 days.

public int lengthOfYear()

Returns the length of the year represented by this date.

This returns the length of the year in days. A Hijrah calendar system year is typically shorter than that of the ISO calendar system.

public HijrahDate with​(TemporalAdjuster adjuster)

Returns an adjusted object of the same type as this object with the adjustment made.

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

public HijrahDate withVariant​(HijrahChronology chronology)

Returns a 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.

public HijrahDate plus​(TemporalAmount amount)

Returns an object of the same type as this object with an amount added.

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.

public HijrahDate minus​(TemporalAmount amount)

Returns an object of the same type as this object with an amount subtracted.

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.

public boolean isLeapYear()

public boolean equals​(Object obj)

Compares this date to another date, including the chronology.

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.

public int hashCode()

public long until​(Temporal endExclusive,
                  TemporalUnit unit)

Calculates the amount of time until another date in terms of the specified unit.

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.

public String toString()

Returns a string representation of the object. In general, the toString 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())