GregorianCalendar

public class GregorianCalendar
extends Calendar

java.lang.Object
↳	java.util.Calendar
	↳	java.util.GregorianCalendar

GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar system used by most of the world.

GregorianCalendar is a hybrid calendar that supports both the Julian and Gregorian calendar systems with the support of a single discontinuity, which corresponds by default to the Gregorian date when the Gregorian calendar was instituted (October 15, 1582 in some countries, later in others). The cutover date may be changed by the caller by calling setGregorianChange().

Historically, in those countries which adopted the Gregorian calendar first, October 4, 1582 (Julian) was thus followed by October 15, 1582 (Gregorian). This calendar models this correctly. Before the Gregorian cutover, GregorianCalendar implements the Julian calendar. The only difference between the Gregorian and the Julian calendar is the leap year rule. The Julian calendar specifies leap years every four years, whereas the Gregorian calendar omits century years which are not divisible by 400.

GregorianCalendar implements proleptic Gregorian and Julian calendars. That is, dates are computed by extrapolating the current rules indefinitely far backward and forward in time. As a result, GregorianCalendar may be used for all years to generate meaningful and consistent results. However, dates obtained using GregorianCalendar are historically accurate only from March 1, 4 AD onward, when modern Julian calendar rules were adopted. Before this date, leap year rules were applied irregularly, and before 45 BC the Julian calendar did not even exist.

Prior to the institution of the Gregorian calendar, New Year's Day was March 25. To avoid confusion, this calendar always uses January 1. A manual adjustment may be made if desired for dates that are prior to the Gregorian changeover and which fall between January 1 and March 24.

Week Of Year and Week Year

Values calculated for the WEEK_OF_YEAR field range from 1 to 53. The first week of a calendar year is the earliest seven day period starting on getFirstDayOfWeek() that contains at least getMinimalDaysInFirstWeek() days from that year. It thus depends on the values of getMinimalDaysInFirstWeek(), getFirstDayOfWeek(), and the day of the week of January 1. Weeks between week 1 of one year and week 1 of the following year (exclusive) are numbered sequentially from 2 to 52 or 53 (except for year(s) involved in the Julian-Gregorian transition).

The getFirstDayOfWeek() and getMinimalDaysInFirstWeek() values are initialized using locale-dependent resources when constructing a GregorianCalendar. The week determination is compatible with the ISO 8601 standard when getFirstDayOfWeek() is MONDAY and getMinimalDaysInFirstWeek() is 4, which values are used in locales where the standard is preferred. These values can explicitly be set by calling setFirstDayOfWeek() and setMinimalDaysInFirstWeek().

A week year is in sync with a WEEK_OF_YEAR cycle. All weeks between the first and last weeks (inclusive) have the same week year value. Therefore, the first and last days of a week year may have different calendar year values.

For example, January 1, 1998 is a Thursday. If getFirstDayOfWeek() is MONDAY and getMinimalDaysInFirstWeek() is 4 (ISO 8601 standard compatible setting), then week 1 of 1998 starts on December 29, 1997, and ends on January 4, 1998. The week year is 1998 for the last three days of calendar year 1997. If, however, getFirstDayOfWeek() is SUNDAY, then week 1 of 1998 starts on January 4, 1998, and ends on January 10, 1998; the first three days of 1998 then are part of week 53 of 1997 and their week year is 1997.

Week Of Month

Values calculated for the WEEK_OF_MONTH field range from 0 to 6. Week 1 of a month (the days with WEEK_OF_MONTH = 1) is the earliest set of at least getMinimalDaysInFirstWeek() contiguous days in that month, ending on the day before getFirstDayOfWeek(). Unlike week 1 of a year, week 1 of a month may be shorter than 7 days, need not start on getFirstDayOfWeek(), and will not include days of the previous month. Days of a month before week 1 have a WEEK_OF_MONTH of 0.

For example, if getFirstDayOfWeek() is SUNDAY and getMinimalDaysInFirstWeek() is 4, then the first week of January 1998 is Sunday, January 4 through Saturday, January 10. These days have a WEEK_OF_MONTH of 1. Thursday, January 1 through Saturday, January 3 have a WEEK_OF_MONTH of 0. If getMinimalDaysInFirstWeek() is changed to 3, then January 1 through January 3 have a WEEK_OF_MONTH of 1.

Default Fields Values

The clear method sets calendar field(s) undefined. GregorianCalendar uses the following default value for each calendar field if its value is undefined.

GregorianCalendar default field values
Field	Default Value
`ERA`	`AD`
`YEAR`	`1970`
`MONTH`	`JANUARY`
`DAY_OF_MONTH`	`1`
`DAY_OF_WEEK`	`the first day of week`
`WEEK_OF_MONTH`	`0`
`DAY_OF_WEEK_IN_MONTH`	`1`
`AM_PM`	`AM`
`HOUR, HOUR_OF_DAY, MINUTE, SECOND, MILLISECOND`	`0`

Default values are not applicable for the fields not listed above.

Example:

 // get the supported ids for GMT-08:00 (Pacific Standard Time) String[] ids = TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000); // if no ids were returned, something is wrong. get out. if (ids.length == 0) System.exit(0); // begin output System.out.println("Current Time"); // create a Pacific Standard Time time zone SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]); // set up rules for Daylight Saving Time pdt.setStartRule(Calendar.APRIL, 1, Calendar.SUNDAY, 2 * 60 * 60 * 1000); pdt.setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2 * 60 * 60 * 1000); // create a GregorianCalendar with the Pacific Daylight time zone // and the current date and time Calendar calendar = new GregorianCalendar(pdt); Date trialTime = new Date(); calendar.setTime(trialTime); // print out a bunch of interesting things System.out.println("ERA: " + calendar.get(Calendar.ERA)); System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); System.out.println("MONTH: " + calendar.get(Calendar.MONTH)); System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR)); System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH)); System.out.println("DATE: " + calendar.get(Calendar.DATE)); System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR)); System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK)); System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH)); System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM)); System.out.println("HOUR: " + calendar.get(Calendar.HOUR)); System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); System.out.println("ZONE_OFFSET: " + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); System.out.println("DST_OFFSET: " + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); System.out.println("Current Time, with hour reset to 3"); calendar.clear(Calendar.HOUR_OF_DAY); // so doesn't override calendar.set(Calendar.HOUR, 3); System.out.println("ERA: " + calendar.get(Calendar.ERA)); System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); System.out.println("MONTH: " + calendar.get(Calendar.MONTH)); System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR)); System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH)); System.out.println("DATE: " + calendar.get(Calendar.DATE)); System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR)); System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK)); System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH)); System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM)); System.out.println("HOUR: " + calendar.get(Calendar.HOUR)); System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); System.out.println("ZONE_OFFSET: " + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); // in hours System.out.println("DST_OFFSET: " + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); // in hours

See also:

TimeZone

Summary

Constants
`int`	`AD` Value of the `ERA` field indicating the common era (Anno Domini), also known as CE.
`int`	`BC` Value of the `ERA` field indicating the period before the common era (before Christ), also known as BCE.

Inherited constants

From class java.util.Calendar

`int`	`ALL_STYLES` A style specifier for `getDisplayNames` indicating names in all styles, such as "January" and "Jan".
`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 in the Gregorian and Julian calendars.
`int`	`AUGUST` Value of the `MONTH` field indicating the eighth month of the year in the Gregorian and Julian calendars.
`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 in the Gregorian and Julian calendars.
`int`	`DST_OFFSET` Field number for `get` and `set` indicating the daylight saving offset in milliseconds.
`int`	`ERA` Field number for `get` and `set` indicating the era, e.g., AD or BC in the Julian calendar.
`int`	`FEBRUARY` Value of the `MONTH` field indicating the second month of the year in the Gregorian and Julian calendars.
`int`	`FIELD_COUNT` The number of distinct fields recognized by `get` and `set`.
`int`	`FRIDAY` Value of the `DAY_OF_WEEK` field indicating Friday.
`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`	`JANUARY` Value of the `MONTH` field indicating the first month of the year in the Gregorian and Julian calendars.
`int`	`JULY` Value of the `MONTH` field indicating the seventh month of the year in the Gregorian and Julian calendars.
`int`	`JUNE` Value of the `MONTH` field indicating the sixth month of the year in the Gregorian and Julian calendars.
`int`	`LONG` A style specifier for `getDisplayName` and `getDisplayNames` equivalent to `LONG_FORMAT`.
`int`	`LONG_FORMAT` A style specifier for `getDisplayName` and `getDisplayNames` indicating a long name used for format.
`int`	`LONG_STANDALONE` A style specifier for `getDisplayName` and `getDisplayNames` indicating a long name used independently, such as a month name as calendar headers.
`int`	`MARCH` Value of the `MONTH` field indicating the third month of the year in the Gregorian and Julian calendars.
`int`	`MAY` Value of the `MONTH` field indicating the fifth month of the year in the Gregorian and Julian calendars.
`int`	`MILLISECOND` Field number for `get` and `set` indicating the millisecond within the second.
`int`	`MINUTE` Field number for `get` and `set` indicating the minute within the hour.
`int`	`MONDAY` Value of the `DAY_OF_WEEK` field indicating Monday.
`int`	`MONTH` Field number for `get` and `set` indicating the month.
`int`	`NARROW_FORMAT` A style specifier for `getDisplayName` and `getDisplayNames` indicating a narrow name used for format.
`int`	`NARROW_STANDALONE` A style specifier for `getDisplayName` and `getDisplayNames` indicating a narrow name independently.
`int`	`NOVEMBER` Value of the `MONTH` field indicating the eleventh month of the year in the Gregorian and Julian calendars.
`int`	`OCTOBER` Value of the `MONTH` field indicating the tenth month of the year in the Gregorian and Julian calendars.
`int`	`PM` Value of the `AM_PM` field indicating the period of the day from noon to just before midnight.
`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 in the Gregorian and Julian calendars.
`int`	`SHORT` A style specifier for `getDisplayName` and `getDisplayNames` equivalent to `SHORT_FORMAT`.
`int`	`SHORT_FORMAT` A style specifier for `getDisplayName` and `getDisplayNames` indicating a short name used for format.
`int`	`SHORT_STANDALONE` A style specifier for `getDisplayName` and `getDisplayNames` indicating a short name used independently, such as a month abbreviation as calendar headers.
`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`	`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`	`ZONE_OFFSET` Field number for `get` and `set` indicating the raw offset from GMT in milliseconds.

Inherited fields

From class java.util.Calendar

`protected boolean`	`areFieldsSet` True if `fields[]` are in sync with the currently set time.
`protected int[]`	`fields` The calendar field values for the currently set time for this calendar.
`protected boolean[]`	`isSet` The flags which tell if a specified calendar field for the calendar is set.
`protected boolean`	`isTimeSet` True if then the value of `time` is valid.
`protected long`	`time` The currently set time for this calendar, expressed in milliseconds after January 1, 1970, 0:00:00 GMT.

Public constructors
`GregorianCalendar()` Constructs a default `GregorianCalendar` using the current time in the default time zone with the default `FORMAT` locale.
`GregorianCalendar(int year, int month, int dayOfMonth)` Constructs a `GregorianCalendar` with the given date set in the default time zone with the default locale.
`GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute)` Constructs a `GregorianCalendar` with the given date and time set for the default time zone with the default locale.
`GregorianCalendar(int year, int month, int dayOfMonth, int hourOfDay, int minute, int second)` Constructs a GregorianCalendar with the given date and time set for the default time zone with the default locale.
`GregorianCalendar(Locale aLocale)` Constructs a `GregorianCalendar` based on the current time in the default time zone with the given locale.
`GregorianCalendar(TimeZone zone)` Constructs a `GregorianCalendar` based on the current time in the given time zone with the default `FORMAT` locale.
`GregorianCalendar(TimeZone zone, Locale aLocale)` Constructs a `GregorianCalendar` based on the current time in the given time zone with the given locale.

Public methods
`void`	`add(int field, int amount)` Adds the specified (signed) amount of time to the given calendar field, based on the calendar's rules.
`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Compares this `GregorianCalendar` to the specified `Object`.
`static GregorianCalendar`	`from(ZonedDateTime zdt)` Obtains an instance of `GregorianCalendar` with the default locale from a `ZonedDateTime` object.
`int`	`getActualMaximum(int field)` Returns the maximum value that this calendar field could have, taking into consideration the given time value and the current values of the `getFirstDayOfWeek`, `getMinimalDaysInFirstWeek`, `getGregorianChange` and `getTimeZone` methods.
`int`	`getActualMinimum(int field)` Returns the minimum value that this calendar field could have, taking into consideration the given time value and the current values of the `getFirstDayOfWeek`, `getMinimalDaysInFirstWeek`, `getGregorianChange` and `getTimeZone` methods.
`String`	`getCalendarType()` Returns `"gregory"` as the calendar type.
`int`	`getGreatestMinimum(int field)` Returns the highest minimum value for the given calendar field of this `GregorianCalendar` instance.
`final Date`	`getGregorianChange()` Gets the Gregorian Calendar change date.
`int`	`getLeastMaximum(int field)` Returns the lowest maximum value for the given calendar field of this `GregorianCalendar` instance.
`int`	`getMaximum(int field)` Returns the maximum value for the given calendar field of this `GregorianCalendar` instance.
`int`	`getMinimum(int field)` Returns the minimum value for the given calendar field of this `GregorianCalendar` instance.
`TimeZone`	`getTimeZone()` Gets the time zone.
`int`	`getWeekYear()` Returns the week year represented by this `GregorianCalendar`.
`int`	`getWeeksInWeekYear()` Returns the number of weeks in the week year represented by this `GregorianCalendar`.
`int`	`hashCode()` Generates the hash code for this `GregorianCalendar` object.
`boolean`	`isLeapYear(int year)` Determines if the given year is a leap year.
`final boolean`	`isWeekDateSupported()` Returns `true` indicating this `GregorianCalendar` supports week dates.
`void`	`roll(int field, boolean up)` Adds or subtracts (up/down) a single unit of time on the given time field without changing larger fields.
`void`	`roll(int field, int amount)` Adds a signed amount to the specified calendar field without changing larger fields.
`void`	`setGregorianChange(Date date)` Sets the `GregorianCalendar` change date.
`void`	`setTimeZone(TimeZone zone)` Sets the time zone with the given time zone value.
`void`	`setWeekDate(int weekYear, int weekOfYear, int dayOfWeek)` Sets this `GregorianCalendar` to the date given by the date specifiers - `weekYear`, `weekOfYear`, and `dayOfWeek`.
`ZonedDateTime`	`toZonedDateTime()` Converts this object to a `ZonedDateTime` that represents the same point on the time-line as this `GregorianCalendar`.

Protected methods
`void`	`computeFields()` Converts the time value (millisecond offset from the Epoch) to calendar field values.
`void`	`computeTime()` Converts calendar field values to the time value (millisecond offset from the Epoch).

Inherited methods

From class java.util.Calendar

`abstract void`	`add(int field, int amount)` Adds or subtracts the specified amount of time to the given calendar field, based on the calendar's rules.
`boolean`	`after(Object when)` Returns whether this `Calendar` represents a time after the time represented by the specified `Object`.
`boolean`	`before(Object when)` Returns whether this `Calendar` represents a time before the time represented by the specified `Object`.
`final void`	`clear()` Sets all the calendar field values and the time value (millisecond offset from the Epoch) of this `Calendar` undefined.
`final void`	`clear(int field)` Sets the given calendar field value and the time value (millisecond offset from the Epoch) of this `Calendar` undefined.
`Object`	`clone()` Creates and returns a copy of this object.
`int`	`compareTo(Calendar anotherCalendar)` Compares the time values (millisecond offsets from the Epoch) represented by two `Calendar` objects.
`void`	`complete()` Fills in any unset fields in the calendar fields.
`abstract void`	`computeFields()` Converts the current millisecond time value `time` to calendar field values in `fields[]`.
`abstract void`	`computeTime()` Converts the current calendar field values in `fields[]` to the millisecond time value `time`.
`boolean`	`equals(Object obj)` Compares this `Calendar` to the specified `Object`.
`int`	`get(int field)` Returns the value of the given calendar field.
`int`	`getActualMaximum(int field)` Returns the maximum value that the specified calendar field could have, given the time value of this `Calendar`.
`int`	`getActualMinimum(int field)` Returns the minimum value that the specified calendar field could have, given the time value of this `Calendar`.
`static Set<String>`	`getAvailableCalendarTypes()` Returns an unmodifiable `Set` containing all calendar types supported by `Calendar` in the runtime environment.
`static Locale[]`	`getAvailableLocales()` Returns an array of all locales for which the `getInstance` methods of this class can return localized instances.
`String`	`getCalendarType()` Returns the calendar type of this `Calendar`.
`String`	`getDisplayName(int field, int style, Locale locale)` Returns the string representation of the calendar `field` value in the given `style` and `locale`.
`Map<String, Integer>`	`getDisplayNames(int field, int style, Locale locale)` Returns a `Map` containing all names of the calendar `field` in the given `style` and `locale` and their corresponding field values.
`int`	`getFirstDayOfWeek()` Gets what the first day of the week is; e.g., `SUNDAY` in the U.S., `MONDAY` in France.
`abstract int`	`getGreatestMinimum(int field)` Returns the highest minimum value for the given calendar field of this `Calendar` instance.
`static Calendar`	`getInstance()` Gets a calendar using the default time zone and locale.
`static Calendar`	`getInstance(Locale aLocale)` Gets a calendar using the default time zone and specified locale.
`static Calendar`	`getInstance(TimeZone zone, Locale aLocale)` Gets a calendar with the specified time zone and locale.
`static Calendar`	`getInstance(TimeZone zone)` Gets a calendar using the specified time zone and default locale.
`abstract int`	`getLeastMaximum(int field)` Returns the lowest maximum value for the given calendar field of this `Calendar` instance.
`abstract int`	`getMaximum(int field)` Returns the maximum value for the given calendar field of this `Calendar` instance.
`int`	`getMinimalDaysInFirstWeek()` Gets what the minimal days required in the first week of the year are; e.g., if the first week is defined as one that contains the first day of the first month of a year, this method returns 1.
`abstract int`	`getMinimum(int field)` Returns the minimum value for the given calendar field of this `Calendar` instance.
`final Date`	`getTime()` Returns a `Date` object representing this `Calendar`'s time value (millisecond offset from the Epoch").
`long`	`getTimeInMillis()` Returns this Calendar's time value in milliseconds.
`TimeZone`	`getTimeZone()` Gets the time zone.
`int`	`getWeekYear()` Returns the week year represented by this `Calendar`.
`int`	`getWeeksInWeekYear()` Returns the number of weeks in the week year represented by this `Calendar`.
`int`	`hashCode()` Returns a hash code for this calendar.
`final int`	`internalGet(int field)` Returns the value of the given calendar field.
`boolean`	`isLenient()` Tells whether date/time interpretation is to be lenient.
`final boolean`	`isSet(int field)` Determines if the given calendar field has a value set, including cases that the value has been set by internal fields calculations triggered by a `get` method call.
`boolean`	`isWeekDateSupported()` Returns whether this `Calendar` supports week dates.
`abstract void`	`roll(int field, boolean up)` Adds or subtracts (up/down) a single unit of time on the given time field without changing larger fields.
`void`	`roll(int field, int amount)` Adds the specified (signed) amount to the specified calendar field without changing larger fields.
`final void`	`set(int year, int month, int date, int hourOfDay, int minute, int second)` Sets the values for the fields `YEAR`, `MONTH`, `DAY_OF_MONTH`, `HOUR_OF_DAY`, `MINUTE`, and `SECOND`.
`final void`	`set(int year, int month, int date, int hourOfDay, int minute)` Sets the values for the calendar fields `YEAR`, `MONTH`, `DAY_OF_MONTH`, `HOUR_OF_DAY`, and `MINUTE`.
`void`	`set(int field, int value)` Sets the given calendar field to the given value.
`final void`	`set(int year, int month, int date)` Sets the values for the calendar fields `YEAR`, `MONTH`, and `DAY_OF_MONTH`.
`void`	`setFirstDayOfWeek(int value)` Sets what the first day of the week is; e.g., `SUNDAY` in the U.S., `MONDAY` in France.
`void`	`setLenient(boolean lenient)` Specifies 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; For example, if the first week is defined as one that contains the first day of the first month of a year, call this method with value 1.
`final void`	`setTime(Date date)` Sets this Calendar's 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.
`void`	`setWeekDate(int weekYear, int weekOfYear, int dayOfWeek)` Sets the date of this `Calendar` with the given date specifiers - week year, week of year, and day of week.
`final Instant`	`toInstant()` Converts this object to an `Instant`.
`String`	`toString()` Return a string representation of this calendar.

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 timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

From interface java.lang.Comparable

abstract int

compareTo(Calendar o)

Compares this object with the specified object for order.

Parameters
`year`	`int`: the value used to set the `YEAR` calendar field in the calendar.
`month`	`int`: the value used to set the `MONTH` calendar field in the calendar. Month value is 0-based. e.g., 0 for January.
`dayOfMonth`	`int`: the value used to set the `DAY_OF_MONTH` calendar field in the calendar.

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

Parameters
`field`	`int`: the calendar field.
`amount`	`int`: the amount of date or time to be added to the field.

Throws
`NullPointerException`	if `zdt` is null
`IllegalArgumentException`	if the zoned date-time is too large to represent as a `GregorianCalendar`

Parameters
`field`	`int`: the time field.
`up`	`boolean`: indicates if the value of the specified calendar field is to be rolled up or rolled down. Use `true` if rolling up, `false` otherwise.

Parameters
`weekYear`	`int`: the week year
`weekOfYear`	`int`: the week number based on `weekYear`
`dayOfWeek`	`int`: the day of week value: one of the constants for the `DAY_OF_WEEK` field: `SUNDAY`, ..., `SATURDAY`.

GregorianCalendar

Week Of Year and Week Year

Week Of Month

Default Fields Values

Summary

Constants

Inherited constants

Inherited fields

Public constructors

Public methods

Protected methods

Inherited methods

Constants

AD

BC

Public constructors