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Summary: Nested Classes | Constants | Inherited Constants | Inherited Fields | Ctors | Methods | Protected Methods | Inherited Methods

# IslamicCalendar

`public class IslamicCalendar`
`` `extends Calendar` ``

java.lang.Object
↳ | android.icu.util.Calendar
| ↳ | android.icu.util.IslamicCalendar

`IslamicCalendar` is a subclass of `Calendar` that that implements the Islamic civil and religious calendars. It is used as the civil calendar in most of the Arab world and the liturgical calendar of the Islamic faith worldwide. This calendar is also known as the "Hijri" calendar, since it starts at the time of Mohammed's emigration (or "hijra") to Medinah on Thursday, July 15, 622 AD (Julian).

The Islamic calendar is strictly lunar, and thus an Islamic year of twelve lunar months does not correspond to the solar year used by most other calendar systems, including the Gregorian. An Islamic year is, on average, about 354 days long, so each successive Islamic year starts about 11 days earlier in the corresponding Gregorian year.

Each month of the calendar starts when the new moon's crescent is visible at sunset. However, in order to keep the time fields in this class synchronized with those of the other calendars and with local clock time, we treat days and months as beginning at midnight, roughly 6 hours after the corresponding sunset.

There are three main variants of the Islamic calendar in existence. The first is the civil calendar, which uses a fixed cycle of alternating 29- and 30-day months, with a leap day added to the last month of 11 out of every 30 years. This calendar is easily calculated and thus predictable in advance, so it is used as the civil calendar in a number of Arab countries. This is the default behavior of a newly-created `IslamicCalendar` object.

The Islamic religious calendar and Saudi Arabia's Umm al-Qura calendar, however, are based on the observation of the crescent moon. It is thus affected by the position at which the observations are made, seasonal variations in the time of sunset, the eccentricities of the moon's orbit, and even the weather at the observation site. This makes it impossible to calculate in advance, and it causes the start of a month in the religious calendar to differ from the civil calendar by up to three days.

Using astronomical calculations for the position of the sun and moon, the moon's illumination, and other factors, it is possible to determine the start of a lunar month with a fairly high degree of certainty. However, these calculations are extremely complicated and thus slow, so most algorithms, including the one used here, are only approximations of the true astronomical calculations. At present, the approximations used in this class are fairly simplistic; they will be improved in later versions of the code.

Like the Islamic religious calendar, Umm al-Qura is also based on the sighting method of the crescent moon but is standardized by Saudi Arabia.

The fixed-cycle civil calendar is used.

This class should not be subclassed.

IslamicCalendar usually should be instantiated using `Calendar.getInstance(ULocale)` passing in a `ULocale` with the tag `"@calendar=islamic"` or `"@calendar=islamic-civil"` or `"@calendar=islamic-umalqura"`.

See also:

- `GregorianCalendar`
- `Calendar`

## Summary

### Nested classes
`enum` | `IslamicCalendar.CalculationType` enumeration of available calendar calculation types

### Constants
`int` | `DHU_AL_HIJJAH` Constant for Dhu al-Hijjah, the 12th month of the Islamic year.
`int` | `DHU_AL_QIDAH` Constant for Dhu al-Qi'dah, the 11th month of the Islamic year.
`int` | `JUMADA_1` Constant for Jumada al-awwal or (Jumada I), the 5th month of the Islamic year.
`int` | `JUMADA_2` Constant for Jumada al-thani or (Jumada II), the 6th month of the Islamic year.
`int` | `MUHARRAM` Constant for Muharram, the 1st month of the Islamic year.
`int` | `RABI_1` Constant for Rabi' al-awwal (or Rabi' I), the 3rd month of the Islamic year.
`int` | `RABI_2` Constant for Rabi' al-thani or (Rabi' II), the 4th month of the Islamic year.
`int` | `RAJAB` Constant for Rajab, the 7th month of the Islamic year.
`int` | `RAMADAN` Constant for Ramadan, the 9th month of the Islamic year.
`int` | `SAFAR` Constant for Safar, the 2nd month of the Islamic year.
`int` | `SHABAN` Constant for Sha'ban, the 8th month of the Islamic year.
`int` | `SHAWWAL` Constant for Shawwal, the 10th month of the Islamic year.

### Inherited constants
From class `android.icu.util.Calendar`
`int` | `AM` Value of the `AM_PM` field indicating the period of the day from midnight to just before noon.
`int` | `AM_PM` Field number for `get` and `set` indicating whether the `HOUR` is before or after noon.
`int` | `APRIL` Value of the `MONTH` field indicating the fourth month of the year.
`int` | `AUGUST` Value of the `MONTH` field indicating the eighth month of the year.
`int` | `BASE_FIELD_COUNT` This constant is deprecated. ICU 58 The numeric value may change over time, see ICU ticket #12420.
`int` | `DATE` Field number for `get` and `set` indicating the day of the month.
`int` | `DAY_OF_MONTH` Field number for `get` and `set` indicating the day of the month.
`int` | `DAY_OF_WEEK` Field number for `get` and `set` indicating the day of the week.
`int` | `DAY_OF_WEEK_IN_MONTH` Field number for `get` and `set` indicating the ordinal number of the day of the week within the current month.
`int` | `DAY_OF_YEAR` Field number for `get` and `set` indicating the day number within the current year.
`int` | `DECEMBER` Value of the `MONTH` field indicating the twelfth month of the year.
`int` | `DOW_LOCAL` [icu] Field number for `get()` and `set()` indicating the localized day of week.
`int` | `DST_OFFSET` Field number for `get` and `set` indicating the daylight savings offset in milliseconds.
`int` | `EPOCH_JULIAN_DAY` The Julian day of the epoch, that is, January 1, 1970 on the Gregorian calendar.
`int` | `ERA` Field number for `get` and `set` indicating the era, e.g., AD or BC in the Julian calendar.
`int` | `EXTENDED_YEAR` [icu] Field number for `get()` and `set()` indicating the extended year.
`int` | `FEBRUARY` Value of the `MONTH` field indicating the second month of the year.
`int` | `FRIDAY` Value of the `DAY_OF_WEEK` field indicating Friday.
`int` | `GREATEST_MINIMUM` Limit type for `getLimit()` and `handleGetLimit()` indicating the greatest minimum value that a field can take.
`int` | `HOUR` Field number for `get` and `set` indicating the hour of the morning or afternoon.
`int` | `HOUR_OF_DAY` Field number for `get` and `set` indicating the hour of the day.
`int` | `INTERNALLY_SET` Value of the time stamp `stamp[]` indicating that a field has been set via computations from the time or from other fields.
`int` | `IS_LEAP_MONTH` [icu] Field indicating whether or not the current month is a leap month.
`int` | `JANUARY` Value of the `MONTH` field indicating the first month of the year.
`int` | `JAN_1_1_JULIAN_DAY` The Julian day of the Gregorian epoch, that is, January 1, 1 on the Gregorian calendar.
`int` | `JULIAN_DAY` [icu] Field number for `get()` and `set()` indicating the modified Julian day number.
`int` | `JULY` Value of the `MONTH` field indicating the seventh month of the year.
`int` | `JUNE` Value of the `MONTH` field indicating the sixth month of the year.
`int` | `LEAST_MAXIMUM` Limit type for `getLimit()` and `handleGetLimit()` indicating the least maximum value that a field can take.
`int` | `MARCH` Value of the `MONTH` field indicating the third month of the year.
`int` | `MAXIMUM` Limit type for `getLimit()` and `handleGetLimit()` indicating the maximum value that a field can take (greatest maximum).
`int` | `MAX_FIELD_COUNT` This constant is deprecated. ICU 58 The numeric value may change over time, see ICU ticket #12420.
`int` | `MAX_JULIAN` The maximum supported Julian day.
`long` | `MAX_MILLIS` The maximum supported epoch milliseconds.
`int` | `MAY` Value of the `MONTH` field indicating the fifth month of the year.
`int` | `MILLISECOND` Field number for `get` and `set` indicating the millisecond within the second.
`int` | `MILLISECONDS_IN_DAY` [icu] Field number for `get()` and `set()` indicating the milliseconds in the day.
`int` | `MINIMUM` Limit type for `getLimit()` and `handleGetLimit()` indicating the minimum value that a field can take (least minimum).
`int` | `MINIMUM_USER_STAMP` If the time stamp `stamp[]` has a value greater than or equal to `MINIMUM_USER_SET` then it has been set by the user via a call to `set()`.
`int` | `MINUTE` Field number for `get` and `set` indicating the minute within the hour.
`int` | `MIN_JULIAN` The minimum supported Julian day.
`long` | `MIN_MILLIS` The minimum supported epoch milliseconds.
`int` | `MONDAY` Value of the `DAY_OF_WEEK` field indicating Monday.
`int` | `MONTH` Field number for `get` and `set` indicating the month.
`int` | `NOVEMBER` Value of the `MONTH` field indicating the eleventh month of the year.
`int` | `OCTOBER` Value of the `MONTH` field indicating the tenth month of the year.
`long` | `ONE_DAY` The number of milliseconds in one day.
`int` | `ONE_HOUR` The number of milliseconds in one hour.
`int` | `ONE_MINUTE` The number of milliseconds in one minute.
`int` | `ONE_SECOND` The number of milliseconds in one second.
`long` | `ONE_WEEK` The number of milliseconds in one week.
`int` | `PM` Value of the `AM_PM` field indicating the period of the day from noon to just before midnight.
`int` | `RESOLVE_REMAP` Value to OR against resolve table field values for remapping.
`int` | `SATURDAY` Value of the `DAY_OF_WEEK` field indicating Saturday.
`int` | `SECOND` Field number for `get` and `set` indicating the second within the minute.
`int` | `SEPTEMBER` Value of the `MONTH` field indicating the ninth month of the year.
`int` | `SUNDAY` Value of the `DAY_OF_WEEK` field indicating Sunday.
`int` | `THURSDAY` Value of the `DAY_OF_WEEK` field indicating Thursday.
`int` | `TUESDAY` Value of the `DAY_OF_WEEK` field indicating Tuesday.
`int` | `UNDECIMBER` Value of the `MONTH` field indicating the thirteenth month of the year.
`int` | `UNSET` Value of the time stamp `stamp[]` indicating that a field has not been set since the last call to `clear()`.
`int` | `WALLTIME_FIRST` [icu]Option used by `setRepeatedWallTimeOption(int)` and `setSkippedWallTimeOption(int)` specifying an ambiguous wall time to be interpreted as the earliest.
`int` | `WALLTIME_LAST` [icu]Option used by `setRepeatedWallTimeOption(int)` and `setSkippedWallTimeOption(int)` specifying an ambiguous wall time to be interpreted as the latest.
`int` | `WALLTIME_NEXT_VALID` [icu]Option used by `setSkippedWallTimeOption(int)` specifying an ambiguous wall time to be interpreted as the next valid wall time.
`int` | `WEDNESDAY` Value of the `DAY_OF_WEEK` field indicating Wednesday.
`int` | `WEEK_OF_MONTH` Field number for `get` and `set` indicating the week number within the current month.
`int` | `WEEK_OF_YEAR` Field number for `get` and `set` indicating the week number within the current year.
`int` | `YEAR` Field number for `get` and `set` indicating the year.
`int` | `YEAR_WOY` [icu] Field number for `get()` and `set()` indicating the extended year corresponding to the `WEEK_OF_YEAR` field.
`int` | `ZONE_OFFSET` Field number for `get` and `set` indicating the raw offset from GMT in milliseconds.

### Inherited fields
From class `android.icu.util.Calendar`
`protected static final Date` | `MAX_DATE` The maximum supported `Date`.
`protected static final Date` | `MIN_DATE` The minimum supported `Date`.

### Public constructors
`IslamicCalendar()` Constructs a default `IslamicCalendar` using the current time in the default time zone with the default `FORMAT` locale.
`IslamicCalendar(TimeZone zone)` Constructs an `IslamicCalendar` based on the current time in the given time zone with the default `FORMAT` locale.
`IslamicCalendar(Locale aLocale)` Constructs an `IslamicCalendar` based on the current time in the default time zone with the given locale.
`IslamicCalendar(ULocale locale)` Constructs an `IslamicCalendar` based on the current time in the default time zone with the given locale.
`IslamicCalendar(TimeZone zone, Locale aLocale)` Constructs an `IslamicCalendar` based on the current time in the given time zone with the given locale.
`IslamicCalendar(TimeZone zone, ULocale locale)` Constructs an `IslamicCalendar` based on the current time in the given time zone with the given locale.
`IslamicCalendar(Date date)` Constructs an `IslamicCalendar` with the given date set in the default time zone with the default `FORMAT` locale.
`IslamicCalendar(int year, int month, int date)` Constructs an `IslamicCalendar` with the given date set in the default time zone with the default `FORMAT` locale.
`IslamicCalendar(int year, int month, int date, int hour, int minute, int second)` Constructs an `IslamicCalendar` with the given date and time set for the default time zone with the default `FORMAT` locale.

### Public methods
`IslamicCalendar.CalculationType` | `getCalculationType()` gets the calculation type for this calendar.
`String` | `getType()` [icu] Returns the calendar type name string for this Calendar object.
`void` | `setCalculationType(IslamicCalendar.CalculationType type)` sets the calculation type for this calendar.

### Protected methods
`void` | `handleComputeFields(int julianDay)` Override Calendar to compute several fields specific to the Islamic calendar system.
`int` | `handleComputeMonthStart(int eyear, int month, boolean useMonth)` Returns the Julian day number of day before the first day of the given month in the given extended year.
`int` | `handleGetExtendedYear()` Returns the extended year defined by the current fields.
`int` | `handleGetLimit(int field, int limitType)` Subclass API for defining limits of different types.
`int` | `handleGetMonthLength(int extendedYear, int month)` Return the length (in days) of the given month.
`int` | `handleGetYearLength(int extendedYear)` Return the number of days in the given Islamic year

### Inherited methods
From class `android.icu.util.Calendar`
`void` | `add(int field, int amount)` Add a signed amount to a specified field, using this calendar's rules.
`boolean` | `after(Object when)` Compares the time field records.
`boolean` | `before(Object when)` Compares the time field records.
`final void` | `clear()` Clears the values of all the time fields.
`final void` | `clear(int field)` Clears the value in the given time field.
`Object` | `clone()` Overrides Cloneable
`int` | `compareTo(Calendar that)` Compares the times (in millis) represented by two `Calendar` objects.
`void` | `complete()` Fills in any unset fields in the time field list.
`void` | `computeFields()` Converts the current millisecond time value `time` to field values in `fields[]`.
`final void` | `computeGregorianFields(int julianDay)` Compute the Gregorian calendar year, month, and day of month from the Julian day.
`int` | `computeGregorianMonthStart(int year, int month)` Compute the Julian day of a month of the Gregorian calendar.
`int` | `computeJulianDay()` Compute the Julian day number as specified by this calendar's fields.
`int` | `computeMillisInDay()` This method is deprecated. ICU 60
`void` | `computeTime()` Converts the current field values in `fields[]` to the millisecond time value `time`.
`int` | `computeZoneOffset(long millis, int millisInDay)` This method is deprecated. ICU 60
`boolean` | `equals(Object obj)` Compares this calendar to the specified object.
`int` | `fieldDifference(Date when, int field)` [icu] Returns the difference between the given time and the time this calendar object is set to.
`String` | `fieldName(int field)` Returns a string name for a field, for debugging and exceptions.
`static final int` | `floorDivide(int numerator, int denominator, int[] remainder)` Divide two integers, returning the floor of the quotient, and the modulus remainder.
`static final int` | `floorDivide(int numerator, int denominator)` Divide two integers, returning the floor of the quotient.
`static final long` | `floorDivide(long numerator, long denominator)` Divide two long integers, returning the floor of the quotient.
`static final int` | `floorDivide(long numerator, int denominator, int[] remainder)` Divide two integers, returning the floor of the quotient, and the modulus remainder.
`final int` | `get(int field)` Returns the value for a given time field.
`int` | `getActualMaximum(int field)` Returns the maximum value that this field could have, given the current date.
`int` | `getActualMinimum(int field)` Returns the minimum value that this field could have, given the current date.
`static Locale[]` | `getAvailableLocales()` Returns the list of locales for which Calendars are installed.
`DateFormat` | `getDateTimeFormat(int dateStyle, int timeStyle, ULocale loc)` [icu] Returns a `DateFormat` appropriate to this calendar.
`DateFormat` | `getDateTimeFormat(int dateStyle, int timeStyle, Locale loc)` [icu] Returns a `DateFormat` appropriate to this calendar.
`String` | `getDisplayName(ULocale loc)` Returns the name of this calendar in the language of the given locale.
`String` | `getDisplayName(Locale loc)` Returns the name of this calendar in the language of the given locale.
`final int` | `getFieldCount()` [icu] Returns the number of fields defined by this calendar.
`int[][][]` | `getFieldResolutionTable()` Returns the field resolution array for this calendar.
`int` | `getFirstDayOfWeek()` Returns what the first day of the week is, where 1 = `SUNDAY` and 7 = `SATURDAY`.
`final int` | `getGreatestMinimum(int field)` Returns the highest minimum value for the given field if varies.
`final int` | `getGregorianDayOfMonth()` Returns the day of month (1-based) on the Gregorian calendar as computed by `computeGregorianFields()`.
`final int` | `getGregorianDayOfYear()` Returns the day of year (1-based) on the Gregorian calendar as computed by `computeGregorianFields()`.
`final int` | `getGregorianMonth()` Returns the month (0-based) on the Gregorian calendar as computed by `computeGregorianFields()`.
`final int` | `getGregorianYear()` Returns the extended year on the Gregorian calendar as computed by `computeGregorianFields()`.
`static Calendar` | `getInstance()` Returns a calendar using the default time zone and locale.
`static Calendar` | `getInstance(Locale aLocale)` Returns a calendar using the default time zone and specified locale.
`static Calendar` | `getInstance(TimeZone zone, Locale aLocale)` Returns a calendar with the specified time zone and locale.
`static Calendar` | `getInstance(TimeZone zone, ULocale locale)` Returns a calendar with the specified time zone and locale.
`static Calendar` | `getInstance(TimeZone zone)` Returns a calendar using the specified time zone and default locale.
`static Calendar` | `getInstance(ULocale locale)` Returns a calendar using the default time zone and specified locale.
`static final String[]` | `getKeywordValuesForLocale(String key, ULocale locale, boolean commonlyUsed)` [icu] Given a key and a locale, returns an array of string values in a preferred order that would make a difference.
`final int` | `getLeastMaximum(int field)` Returns the lowest maximum value for the given field if varies.
`int` | `getLimit(int field, int limitType)` Returns a limit for a field.
`final int` | `getMaximum(int field)` Returns the maximum value for the given time field.
`int` | `getMinimalDaysInFirstWeek()` Returns what the minimal days required in the first week of the year are.
`final int` | `getMinimum(int field)` Returns the minimum value for the given time field.
`int` | `getRepeatedWallTimeOption()` [icu]Gets the behavior for handling wall time repeating multiple times at negative time zone offset transitions.
`int` | `getSkippedWallTimeOption()` [icu]Gets the behavior for handling skipped wall time at positive time zone offset transitions.
`final int` | `getStamp(int field)` Returns the timestamp of a field.
`final Date` | `getTime()` Returns this Calendar's current time.
`long` | `getTimeInMillis()` Returns this Calendar's current time as a long.
`TimeZone` | `getTimeZone()` Returns the time zone.
`String` | `getType()` [icu] Returns the calendar type name string for this Calendar object.
`Calendar.WeekData` | `getWeekData()` [icu] Return simple, immutable struct-like class for access to the week data in this calendar.
`static Calendar.WeekData` | `getWeekDataForRegion(String region)` [icu] Return simple, immutable struct-like class for access to the CLDR week data.
`static final int` | `gregorianMonthLength(int y, int m)` Returns the length of a month of the Gregorian calendar.
`static final int` | `gregorianPreviousMonthLength(int y, int m)` Returns the length of a previous month of the Gregorian calendar.
`void` | `handleComputeFields(int julianDay)` Subclasses may override this method to compute several fields specific to each calendar system.
`int` | `handleComputeJulianDay(int bestField)` Subclasses may override this.
`abstract int` | `handleComputeMonthStart(int eyear, int month, boolean useMonth)` Returns the Julian day number of day before the first day of the given month in the given extended year.
`int[]` | `handleCreateFields()` Subclasses that use additional fields beyond those defined in `Calendar` should override this method to return an `int[]` array of the appropriate length.
`DateFormat` | `handleGetDateFormat(String pattern, String override, Locale locale)` Creates a `DateFormat` appropriate to this calendar.
`DateFormat` | `handleGetDateFormat(String pattern, ULocale locale)` Creates a `DateFormat` appropriate to this calendar.
`DateFormat` | `handleGetDateFormat(String pattern, Locale locale)` Creates a `DateFormat` appropriate to this calendar.
`abstract int` | `handleGetExtendedYear()` Returns the extended year defined by the current fields.
`abstract int` | `handleGetLimit(int field, int limitType)` Subclass API for defining limits of different types.
`int` | `handleGetMonthLength(int extendedYear, int month)` Returns the number of days in the given month of the given extended year of this calendar system.
`int` | `handleGetYearLength(int eyear)` Returns the number of days in the given extended year of this calendar system.
`int` | `hashCode()` Returns a hash code for this calendar.
`final int` | `internalGet(int field)` Returns the value for a given time field.
`final int` | `internalGet(int field, int defaultValue)` Returns the value for a given time field, or return the given default value if the field is not set.
`final long` | `internalGetTimeInMillis()` Returns the current milliseconds without recomputing.
`final void` | `internalSet(int field, int value)` Set a field to a value.
`boolean` | `isEquivalentTo(Calendar other)` [icu] Returns true if the given Calendar object is equivalent to this one.
`static final boolean` | `isGregorianLeapYear(int year)` Determines if the given year is a leap year.
`boolean` | `isLenient()` Tell whether date/time interpretation is to be lenient.
`final boolean` | `isSet(int field)` Determines if the given time field has a value set.
`boolean` | `isWeekend(Date date)` [icu] Returns true if the given date and time is in the weekend in this calendar system.
`boolean` | `isWeekend()` [icu] Returns true if this Calendar's current date and time is in the weekend in this calendar system.
`static final int` | `julianDayToDayOfWeek(int julian)` Returns the day of week, from SUNDAY to SATURDAY, given a Julian day.
`static final long` | `julianDayToMillis(int julian)` Converts Julian day to time as milliseconds.
`static final int` | `millisToJulianDay(long millis)` Converts time as milliseconds to Julian day.
`int` | `newerField(int defaultField, int alternateField)` Returns the field that is newer, either defaultField, or alternateField.
`int` | `newestStamp(int first, int last, int bestStampSoFar)` Returns the newest stamp of a given range of fields.
`void` | `pinField(int field)` Adjust the specified field so that it is within the allowable range for the date to which this calendar is set.
`void` | `prepareGetActual(int field, boolean isMinimum)` Prepare this calendar for computing the actual minimum or maximum.
`int` | `resolveFields(int[][][] precedenceTable)` Given a precedence table, return the newest field combination in the table, or -1 if none is found.
`final void` | `roll(int field, boolean up)` Rolls (up/down) a single unit of time on the given field.
`void` | `roll(int field, int amount)` Rolls (up/down) a specified amount time on the given field.
`final void` | `set(int year, int month, int date, int hour, int minute, int second)` Sets the values for the fields year, month, date, hour, minute, and second.
`final void` | `set(int year, int month, int date, int hour, int minute)` Sets the values for the fields year, month, date, hour, and minute.
`final void` | `set(int field, int value)` Sets the time field with the given value.
`final void` | `set(int year, int month, int date)` Sets the values for the fields year, month, and date.
`void` | `setFirstDayOfWeek(int value)` Sets what the first day of the week is, where 1 = `SUNDAY` and 7 = `SATURDAY`.
`void` | `setLenient(boolean lenient)` Specify whether or not date/time interpretation is to be lenient.
`void` | `setMinimalDaysInFirstWeek(int value)` Sets what the minimal days required in the first week of the year are.
`void` | `setRepeatedWallTimeOption(int option)` [icu]Sets the behavior for handling wall time repeating multiple times at negative time zone offset transitions.
`void` | `setSkippedWallTimeOption(int option)` [icu]Sets the behavior for handling skipped wall time at positive time zone offset transitions.
`final void` | `setTime(Date date)` Sets this Calendar's current time with the given Date.
`void` | `setTimeInMillis(long millis)` Sets this Calendar's current time from the given long value.
`void` | `setTimeZone(TimeZone value)` Sets the time zone with the given time zone value.
`Calendar` | `setWeekData(Calendar.WeekData wdata)` [icu] Set data in this calendar based on the WeekData input.
`String` | `toString()` Returns a string representation of this calendar.
`void` | `validateField(int field)` Validate a single field of this calendar.
`final void` | `validateField(int field, int min, int max)` Validate a single field of this calendar given its minimum and maximum allowed value.
`void` | `validateFields()` Ensure that each field is within its valid range by calling `validateField(int)` on each field that has been set.
`int` | `weekNumber(int desiredDay, int dayOfPeriod, int dayOfWeek)` Returns the week number of a day, within a period.
`final int` | `weekNumber(int dayOfPeriod, int dayOfWeek)` Returns the week number of a day, within a period.
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 timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `java.lang.Comparable`
`abstract int` | `compareTo(Calendar o)` Compares this object with the specified object for order.

## Constants

### DHU_AL_HIJJAH

    public static final int DHU_AL_HIJJAH

Constant for Dhu al-Hijjah, the 12th month of the Islamic year.

Constant Value: 11 (0x0000000b)

### DHU_AL_QIDAH

    public static final int DHU_AL_QIDAH

Constant for Dhu al-Qi'dah, the 11th month of the Islamic year.

Constant Value: 10 (0x0000000a)

### JUMADA_1

    public static final int JUMADA_1

Constant for Jumada al-awwal or (Jumada I), the 5th month of the Islamic year.

Constant Value: 4 (0x00000004)

### JUMADA_2

    public static final int JUMADA_2

Constant for Jumada al-thani or (Jumada II), the 6th month of the Islamic year.

Constant Value: 5 (0x00000005)

### MUHARRAM

    public static final int MUHARRAM

Constant for Muharram, the 1st month of the Islamic year.

Constant Value: 0 (0x00000000)

### RABI_1

    public static final int RABI_1

Constant for Rabi' al-awwal (or Rabi' I), the 3rd month of the Islamic year.

Constant Value: 2 (0x00000002)

### RABI_2

    public static final int RABI_2

Constant for Rabi' al-thani or (Rabi' II), the 4th month of the Islamic year.

Constant Value: 3 (0x00000003)

### RAJAB

    public static final int RAJAB

Constant for Rajab, the 7th month of the Islamic year.

Constant Value: 6 (0x00000006)

### RAMADAN

    public static final int RAMADAN

Constant for Ramadan, the 9th month of the Islamic year.

Constant Value: 8 (0x00000008)

### SAFAR

    public static final int SAFAR

Constant for Safar, the 2nd month of the Islamic year.

Constant Value: 1 (0x00000001)

### SHABAN

    public static final int SHABAN

Constant for Sha'ban, the 8th month of the Islamic year.

Constant Value: 7 (0x00000007)

### SHAWWAL

    public static final int SHAWWAL

Constant for Shawwal, the 10th month of the Islamic year.

Constant Value: 9 (0x00000009)

## Public constructors

### IslamicCalendar

    public IslamicCalendar ()

Constructs a default `IslamicCalendar` using the current time in the default time zone with the default `FORMAT` locale.

See also:

- `ULocale.Category.FORMAT`

### IslamicCalendar

    public IslamicCalendar (TimeZone zone)

Constructs an `IslamicCalendar` based on the current time in the given time zone with the default `FORMAT` locale.

Parameters
`zone` | `TimeZone`: the given time zone.

See also:

- `ULocale.Category.FORMAT`

### IslamicCalendar

    public IslamicCalendar (Locale aLocale)

Constructs an `IslamicCalendar` based on the current time in the default time zone with the given locale.

Parameters
`aLocale` | `Locale`: the given locale.

### IslamicCalendar

    public IslamicCalendar (ULocale locale)

Constructs an `IslamicCalendar` based on the current time in the default time zone with the given locale.

Parameters
`locale` | `ULocale`: the given ulocale.

### IslamicCalendar

    public IslamicCalendar (TimeZone zone,
                    Locale aLocale)

Constructs an `IslamicCalendar` based on the current time in the given time zone with the given locale.

Parameters
`zone` | `TimeZone`: the given time zone.
`aLocale` | `Locale`: the given locale.

### IslamicCalendar

    public IslamicCalendar (TimeZone zone,
                    ULocale locale)

Constructs an `IslamicCalendar` based on the current time in the given time zone with the given locale.

Parameters
`zone` | `TimeZone`: the given time zone.
`locale` | `ULocale`: the given ulocale.

### IslamicCalendar

    public IslamicCalendar (Date date)

Constructs an `IslamicCalendar` with the given date set in the default time zone with the default `FORMAT` locale.

Parameters
`date` | `Date`: The date to which the new calendar is set.

See also:

- `ULocale.Category.FORMAT`

### IslamicCalendar

    public IslamicCalendar (int year,
                    int month,
                    int date)

Constructs an `IslamicCalendar` with the given date set in the default time zone with the default `FORMAT` locale.

Parameters
`year` | `int`: the value used to set the `YEAR` time field in the calendar.
`month` | `int`: the value used to set the `MONTH` time field in the calendar. Note that the month value is 0-based. e.g., 0 for Muharram.
`date` | `int`: the value used to set the `DATE` time field in the calendar.

See also:

- `ULocale.Category.FORMAT`

### IslamicCalendar

    public IslamicCalendar (int year,
                    int month,
                    int date,
                    int hour,
                    int minute,
                    int second)

Constructs an `IslamicCalendar` with the given date and time set for the default time zone with the default `FORMAT` locale.

Parameters
`year` | `int`: the value used to set the `YEAR` time field in the calendar.
`month` | `int`: the value used to set the `MONTH` time field in the calendar. Note that the month value is 0-based. e.g., 0 for Muharram.
`date` | `int`: the value used to set the `DATE` time field in the calendar.
`hour` | `int`: the value used to set the `HOUR_OF_DAY` time field in the calendar.
`minute` | `int`: the value used to set the `MINUTE` time field in the calendar.
`second` | `int`: the value used to set the `SECOND` time field in the calendar.

See also:

- `ULocale.Category.FORMAT`

## Public methods

### getCalculationType

    public IslamicCalendar.CalculationType getCalculationType ()

gets the calculation type for this calendar.

Returns
`IslamicCalendar.CalculationType` |

### getType

    public String getType ()

[icu] Returns the calendar type name string for this Calendar object. The returned string is the legacy ICU calendar attribute value, for example, "gregorian" or "japanese".

See type="old type name" for the calendar attribute of locale IDs at http://www.unicode.org/reports/tr35/#Key_Type_Definitions

Returns
`String` | legacy calendar type name string

### setCalculationType

    public void setCalculationType (IslamicCalendar.CalculationType type)

sets the calculation type for this calendar.

Parameters
`type` | `IslamicCalendar.CalculationType`

## Protected methods

### handleComputeFields

    protected void handleComputeFields (int julianDay)

Override Calendar to compute several fields specific to the Islamic calendar system. These are:

- ERA
- YEAR
- MONTH
- DAY_OF_MONTH
- DAY_OF_YEAR
- EXTENDED_YEAR

The DAY_OF_WEEK and DOW_LOCAL fields are already set when this method is called. The getGregorianXxx() methods return Gregorian calendar equivalents for the given Julian day.

Parameters
`julianDay` | `int`

### handleComputeMonthStart

    protected int handleComputeMonthStart (int eyear,
                    int month,
                    boolean useMonth)

Returns the Julian day number of day before the first day of the given month in the given extended year. Subclasses should override this method to implement their calendar system.

Parameters
`eyear` | `int`: the extended year
`month` | `int`: the zero-based month, or 0 if useMonth is false
`useMonth` | `boolean`: if false, compute the day before the first day of the given year, otherwise, compute the day before the first day of the given month

Returns
`int` | the Julian day number of the day before the first day of the given month and year

### handleGetExtendedYear

    protected int handleGetExtendedYear ()

Returns the extended year defined by the current fields. This will use the EXTENDED_YEAR field or the YEAR and supra-year fields (such as ERA) specific to the calendar system, depending on which set of fields is newer.

Returns
`int` | the extended year

### handleGetLimit

    protected int handleGetLimit (int field,
                    int limitType)

Subclass API for defining limits of different types. Subclasses must implement this method to return limits for the following fields:

    ERA
     YEAR
     MONTH
     WEEK_OF_YEAR
     WEEK_OF_MONTH
     DAY_OF_MONTH
     DAY_OF_YEAR
     DAY_OF_WEEK_IN_MONTH
     YEAR_WOY
     EXTENDED_YEAR

Parameters
`field` | `int`: one of the above field numbers
`limitType` | `int`: one of `MINIMUM`, `GREATEST_MINIMUM`, `LEAST_MAXIMUM`, or `MAXIMUM`

Returns
`int` |

### handleGetMonthLength

    protected int handleGetMonthLength (int extendedYear,
                    int month)

Return the length (in days) of the given month.

Parameters
`extendedYear` | `int`: The hijri year
`month` | `int`: The hijri month, 0-based

Returns
`int` |

### handleGetYearLength

    protected int handleGetYearLength (int extendedYear)

Return the number of days in the given Islamic year

Parameters
`extendedYear` | `int`

Returns
`int` |

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