HebrewCalendar

public class HebrewCalendar
extends Calendar

java.lang.Object
   ↳ android.icu.util.Calendar
     ↳ android.icu.util.HebrewCalendar


HebrewCalendar is a subclass of Calendar that that implements the traditional Hebrew calendar. This is the civil calendar in Israel and the liturgical calendar of the Jewish faith worldwide.

The Hebrew calendar is lunisolar and thus has a number of interesting properties that distinguish it from the Gregorian. Months start on the day of (an arithmetic approximation of) each new moon. Since the solar year (approximately 365.24 days) is not an even multiple of the lunar month (approximately 29.53 days) an extra "leap month" is inserted in 7 out of every 19 years. To make matters even more interesting, the start of a year can be delayed by up to three days in order to prevent certain holidays from falling on the Sabbath and to prevent certain illegal year lengths. Finally, the lengths of certain months can vary depending on the number of days in the year.

The leap month is known as "Adar 1" and is inserted between the months of Shevat and Adar in leap years. Since the leap month does not come at the end of the year, calculations involving month numbers are particularly complex. Users of this class should make sure to use the roll and add methods rather than attempting to perform date arithmetic by manipulating the fields directly.

Note: In the traditional Hebrew calendar, days start 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.

If you are interested in more information on the rules behind the Hebrew calendar, see one of the following references:

This class should not be subclassed.

HebrewCalendar usually should be instantiated using getInstance(ULocale) passing in a ULocale with the tag "@calendar=hebrew".

Summary

Constants

int ADAR

Constant for the Adar, the 7th month of the Hebrew year.

int ADAR_1

Constant for Adar I, the 6th month of the Hebrew year (present in leap years only).

int AV

Constant for Av, the 12th month of the Hebrew year.

int ELUL

Constant for Elul, the 13th month of the Hebrew year.

int HESHVAN

Constant for Heshvan, the 2nd month of the Hebrew year.

int IYAR

Constant for Iyar, the 9th month of the Hebrew year.

int KISLEV

Constant for Kislev, the 3rd month of the Hebrew year.

int NISAN

Constant for Nisan, the 8th month of the Hebrew year.

int SHEVAT

Constant for Shevat, the 5th month of the Hebrew year.

int SIVAN

Constant for Sivan, the 10th month of the Hebrew year.

int TAMUZ

Constant for Tammuz, the 11th month of the Hebrew year.

int TEVET

Constant for Tevet, the 4th month of the Hebrew year.

int TISHRI

Constant for Tishri, the 1st month of the Hebrew year.

Inherited constants

Inherited fields

Public constructors

HebrewCalendar()

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

HebrewCalendar(TimeZone zone)

Constructs a HebrewCalendar based on the current time in the given time zone with the default FORMAT locale.

HebrewCalendar(Locale aLocale)

Constructs a HebrewCalendar based on the current time in the default time zone with the given locale.

HebrewCalendar(ULocale locale)

Constructs a HebrewCalendar based on the current time in the default time zone with the given locale.

HebrewCalendar(TimeZone zone, Locale aLocale)

Constructs a HebrewCalendar based on the current time in the given time zone with the given locale.

HebrewCalendar(TimeZone zone, ULocale locale)

Constructs a HebrewCalendar based on the current time in the given time zone with the given locale.

HebrewCalendar(int year, int month, int date)

Constructs a HebrewCalendar with the given date set in the default time zone with the default FORMAT locale.

HebrewCalendar(Date date)

Constructs a HebrewCalendar with the given date set in the default time zone with the default FORMAT locale.

HebrewCalendar(int year, int month, int date, int hour, int minute, int second)

Constructs a HebrewCalendar with the given date and time set for the default time zone with the default FORMAT locale.

Public methods

void add(int field, int amount)

Add a signed amount to a specified field, using this calendar's rules.

String getType()

[icu] Returns the calendar type name string for this Calendar object.

void roll(int field, int amount)

Rolls (up/down) a specified amount time on the given field.

Protected methods

void handleComputeFields(int julianDay)

Subclasses may override this method to compute several fields specific to each calendar system.

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

Return JD of start of given month/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)

Returns the length of the given month in the given year

int handleGetYearLength(int eyear)

Returns the number of days in the given Hebrew year

Inherited methods

Constants

ADAR

added in API level 24
int ADAR

Constant for the Adar, the 7th month of the Hebrew year.

Constant Value: 6 (0x00000006)

ADAR_1

added in API level 24
int ADAR_1

Constant for Adar I, the 6th month of the Hebrew year (present in leap years only). In non-leap years, the calendar jumps from Shevat (5th month) to Adar (7th month).

Constant Value: 5 (0x00000005)

AV

added in API level 24
int AV

Constant for Av, the 12th month of the Hebrew year.

Constant Value: 11 (0x0000000b)

ELUL

added in API level 24
int ELUL

Constant for Elul, the 13th month of the Hebrew year.

Constant Value: 12 (0x0000000c)

HESHVAN

added in API level 24
int HESHVAN

Constant for Heshvan, the 2nd month of the Hebrew year.

Constant Value: 1 (0x00000001)

IYAR

added in API level 24
int IYAR

Constant for Iyar, the 9th month of the Hebrew year.

Constant Value: 8 (0x00000008)

KISLEV

added in API level 24
int KISLEV

Constant for Kislev, the 3rd month of the Hebrew year.

Constant Value: 2 (0x00000002)

NISAN

added in API level 24
int NISAN

Constant for Nisan, the 8th month of the Hebrew year.

Constant Value: 7 (0x00000007)

SHEVAT

added in API level 24
int SHEVAT

Constant for Shevat, the 5th month of the Hebrew year.

Constant Value: 4 (0x00000004)

SIVAN

added in API level 24
int SIVAN

Constant for Sivan, the 10th month of the Hebrew year.

Constant Value: 9 (0x00000009)

TAMUZ

added in API level 24
int TAMUZ

Constant for Tammuz, the 11th month of the Hebrew year.

Constant Value: 10 (0x0000000a)

TEVET

added in API level 24
int TEVET

Constant for Tevet, the 4th month of the Hebrew year.

Constant Value: 3 (0x00000003)

TISHRI

added in API level 24
int TISHRI

Constant for Tishri, the 1st month of the Hebrew year.

Constant Value: 0 (0x00000000)

Public constructors

HebrewCalendar

added in API level 24
HebrewCalendar ()

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

See also:

HebrewCalendar

added in API level 24
HebrewCalendar (TimeZone zone)

Constructs a HebrewCalendar based on the current time in the given time zone with the default FORMAT locale.

Parameters
zone TimeZone: The time zone for the new calendar.

See also:

HebrewCalendar

added in API level 24
HebrewCalendar (Locale aLocale)

Constructs a HebrewCalendar based on the current time in the default time zone with the given locale.

Parameters
aLocale Locale: The locale for the new calendar.

HebrewCalendar

added in API level 24
HebrewCalendar (ULocale locale)

Constructs a HebrewCalendar based on the current time in the default time zone with the given locale.

Parameters
locale ULocale: The locale for the new calendar.

HebrewCalendar

added in API level 24
HebrewCalendar (TimeZone zone, 
                Locale aLocale)

Constructs a HebrewCalendar based on the current time in the given time zone with the given locale.

Parameters
zone TimeZone: The time zone for the new calendar.

aLocale Locale: The locale for the new calendar.

HebrewCalendar

added in API level 24
HebrewCalendar (TimeZone zone, 
                ULocale locale)

Constructs a HebrewCalendar based on the current time in the given time zone with the given locale.

Parameters
zone TimeZone: The time zone for the new calendar.

locale ULocale: The locale for the new calendar.

HebrewCalendar

added in API level 24
HebrewCalendar (int year, 
                int month, 
                int date)

Constructs a HebrewCalendar with the given date set in the default time zone with the default FORMAT locale.

Parameters
year int: The value used to set the calendar's YEAR time field.

month int: The value used to set the calendar's MONTH time field. The value is 0-based. e.g., 0 for Tishri.

date int: The value used to set the calendar's DATE time field.

See also:

HebrewCalendar

added in API level 24
HebrewCalendar (Date date)

Constructs a HebrewCalendar 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:

HebrewCalendar

added in API level 24
HebrewCalendar (int year, 
                int month, 
                int date, 
                int hour, 
                int minute, 
                int second)

Constructs a HebrewCalendar 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 calendar's YEAR time field.

month int: The value used to set the calendar's MONTH time field. The value is 0-based. e.g., 0 for Tishri.

date int: The value used to set the calendar's DATE time field.

hour int: The value used to set the calendar's HOUR_OF_DAY time field.

minute int: The value used to set the calendar's MINUTE time field.

second int: The value used to set the calendar's SECOND time field.

See also:

Public methods

add

added in API level 24
void add (int field, 
                int amount)

Add a signed amount to a specified field, using this calendar's rules. For example, to add three days to the current date, you can call add(Calendar.DATE, 3).

When adding to certain fields, the values of other fields may conflict and need to be changed. For example, when adding one to the MONTH field for the date "30 Av 5758", the DAY_OF_MONTH field must be adjusted so that the result is "29 Elul 5758" rather than the invalid "30 Elul 5758".

This method is able to add to all fields except for ERA, DST_OFFSET, and ZONE_OFFSET.

Note: You should always use roll and add rather than attempting to perform arithmetic operations directly on the fields of a HebrewCalendar. Since the MONTH field behaves discontinuously in non-leap years, simple arithmetic can give invalid results.

Parameters
field int: the time field.

amount int: the amount to add to the field.

Throws
IllegalArgumentException if the field is invalid or refers to a field that cannot be handled by this method.

getType

added in API level 24
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

roll

added in API level 24
void roll (int field, 
                int amount)

Rolls (up/down) a specified amount time on the given field. For example, to roll the current date up by three days, you can call roll(Calendar.DATE, 3). If the field is rolled past its maximum allowable value, it will "wrap" back to its minimum and continue rolling. For example, calling roll(Calendar.DATE, 10) on a Hebrew calendar set to "25 Av 5758" will result in the date "5 Av 5758".

When rolling certain fields, the values of other fields may conflict and need to be changed. For example, when rolling the MONTH field upward by one for the date "30 Av 5758", the DAY_OF_MONTH field must be adjusted so that the result is "29 Elul 5758" rather than the invalid "30 Elul".

This method is able to roll all fields except for ERA, DST_OFFSET, and ZONE_OFFSET. Subclasses may, of course, add support for additional fields in their overrides of roll.

Note: You should always use roll and add rather than attempting to perform arithmetic operations directly on the fields of a HebrewCalendar. Since the MONTH field behaves discontinuously in non-leap years, simple arithmetic can give invalid results.

Parameters
field int: the time field.

amount int: the amount by which the field should be rolled.

Throws
IllegalArgumentException if the field is invalid or refers to a field that cannot be handled by this method.

Protected methods

handleComputeFields

added in API level 24
void handleComputeFields (int julianDay)

Subclasses may override this method to compute several fields specific to each calendar system. These are:

  • ERA
  • YEAR
  • MONTH
  • DAY_OF_MONTH
  • DAY_OF_YEAR
  • EXTENDED_YEAR
Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields, which will be set when this method is called. Subclasses can also call the getGregorianXxx() methods to obtain Gregorian calendar equivalents for the given Julian day.

In addition, subclasses should compute any subclass-specific fields, that is, fields from BASE_FIELD_COUNT to getFieldCount() - 1.

Parameters
julianDay int

handleComputeMonthStart

added in API level 24
int handleComputeMonthStart (int eyear, 
                int month, 
                boolean useMonth)

Return JD of start of given month/year.

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

added in API level 24
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

added in API level 24
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

added in API level 24
int handleGetMonthLength (int extendedYear, 
                int month)

Returns the length of the given month in the given year

Parameters
extendedYear int

month int

Returns
int

handleGetYearLength

added in API level 24
int handleGetYearLength (int eyear)

Returns the number of days in the given Hebrew year

Parameters
eyear int

Returns
int