# GregorianCalendar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Summary: [Constants](https://developer.android.com/reference/java/util/GregorianCalendar#constants) \| [Inherited Constants](https://developer.android.com/reference/java/util/GregorianCalendar#inhconstants) \| [Inherited Fields](https://developer.android.com/reference/java/util/GregorianCalendar#inhfields) \| [Ctors](https://developer.android.com/reference/java/util/GregorianCalendar#pubctors) \| [Methods](https://developer.android.com/reference/java/util/GregorianCalendar#pubmethods) \| [Protected Methods](https://developer.android.com/reference/java/util/GregorianCalendar#promethods) \| [Inherited Methods](https://developer.android.com/reference/java/util/GregorianCalendar#inhmethods)
# GregorianCalendar
`
public
class
GregorianCalendar
`
`
`
`
extends `[Calendar](https://developer.android.com/reference/java/util/Calendar)`
`
`
`
|---|---|-----------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) |||
| ↳ | [java.util.Calendar](https://developer.android.com/reference/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()](https://developer.android.com/reference/java/util/GregorianCalendar#setGregorianChange(java.util.Date)).
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](https://developer.android.com/reference/java/util/Calendar#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()](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()) that contains at
least [getMinimalDaysInFirstWeek()](https://developer.android.com/reference/java/util/Calendar#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()](https://developer.android.com/reference/java/util/Calendar#setFirstDayOfWeek(int)) and
[setMinimalDaysInFirstWeek()](https://developer.android.com/reference/java/util/Calendar#setMinimalDaysInFirstWeek(int)).
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.
| 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` |
|--------------------------------------------------|-------------------------|
[GregorianCalendar default field values]
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](https://developer.android.com/reference/java/util/TimeZone)
## Summary
| ### Constants ||
|-------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `int` | [AD](https://developer.android.com/reference/java/util/GregorianCalendar#AD) Value of the `ERA` field indicating the common era (Anno Domini), also known as CE. |
| `int` | [BC](https://developer.android.com/reference/java/util/GregorianCalendar#BC) Value of the `ERA` field indicating the period before the common era (before Christ), also known as BCE. |
| ### Inherited constants |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------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| From class [java.util.Calendar](https://developer.android.com/reference/java/util/Calendar) |-------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | [ALL_STYLES](https://developer.android.com/reference/java/util/Calendar#ALL_STYLES) A style specifier for [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) indicating names in all styles, such as "January" and "Jan". | | `int` | [AM](https://developer.android.com/reference/java/util/Calendar#AM) Value of the [AM_PM](https://developer.android.com/reference/java/util/Calendar#AM_PM) field indicating the period of the day from midnight to just before noon. | | `int` | [AM_PM](https://developer.android.com/reference/java/util/Calendar#AM_PM) Field number for `get` and `set` indicating whether the `HOUR` is before or after noon. | | `int` | [APRIL](https://developer.android.com/reference/java/util/Calendar#APRIL) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the fourth month of the year in the Gregorian and Julian calendars. | | `int` | [AUGUST](https://developer.android.com/reference/java/util/Calendar#AUGUST) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the eighth month of the year in the Gregorian and Julian calendars. | | `int` | [DATE](https://developer.android.com/reference/java/util/Calendar#DATE) Field number for `get` and `set` indicating the day of the month. | | `int` | [DAY_OF_MONTH](https://developer.android.com/reference/java/util/Calendar#DAY_OF_MONTH) Field number for `get` and `set` indicating the day of the month. | | `int` | [DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) Field number for `get` and `set` indicating the day of the week. | | `int` | [DAY_OF_WEEK_IN_MONTH](https://developer.android.com/reference/java/util/Calendar#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](https://developer.android.com/reference/java/util/Calendar#DAY_OF_YEAR) Field number for `get` and `set` indicating the day number within the current year. | | `int` | [DECEMBER](https://developer.android.com/reference/java/util/Calendar#DECEMBER) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the twelfth month of the year in the Gregorian and Julian calendars. | | `int` | [DST_OFFSET](https://developer.android.com/reference/java/util/Calendar#DST_OFFSET) Field number for `get` and `set` indicating the daylight saving offset in milliseconds. | | `int` | [ERA](https://developer.android.com/reference/java/util/Calendar#ERA) Field number for `get` and `set` indicating the era, e.g., AD or BC in the Julian calendar. | | `int` | [FEBRUARY](https://developer.android.com/reference/java/util/Calendar#FEBRUARY) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the second month of the year in the Gregorian and Julian calendars. | | `int` | [FIELD_COUNT](https://developer.android.com/reference/java/util/Calendar#FIELD_COUNT) The number of distinct fields recognized by `get` and `set`. | | `int` | [FRIDAY](https://developer.android.com/reference/java/util/Calendar#FRIDAY) Value of the [DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) field indicating Friday. | | `int` | [HOUR](https://developer.android.com/reference/java/util/Calendar#HOUR) Field number for `get` and `set` indicating the hour of the morning or afternoon. | | `int` | [HOUR_OF_DAY](https://developer.android.com/reference/java/util/Calendar#HOUR_OF_DAY) Field number for `get` and `set` indicating the hour of the day. | | `int` | [JANUARY](https://developer.android.com/reference/java/util/Calendar#JANUARY) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the first month of the year in the Gregorian and Julian calendars. | | `int` | [JULY](https://developer.android.com/reference/java/util/Calendar#JULY) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the seventh month of the year in the Gregorian and Julian calendars. | | `int` | [JUNE](https://developer.android.com/reference/java/util/Calendar#JUNE) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the sixth month of the year in the Gregorian and Julian calendars. | | `int` | [LONG](https://developer.android.com/reference/java/util/Calendar#LONG) A style specifier for [getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale)) and [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) equivalent to [LONG_FORMAT](https://developer.android.com/reference/java/util/Calendar#LONG_FORMAT). | | `int` | [LONG_FORMAT](https://developer.android.com/reference/java/util/Calendar#LONG_FORMAT) A style specifier for [getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale)) and [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) indicating a long name used for format. | | `int` | [LONG_STANDALONE](https://developer.android.com/reference/java/util/Calendar#LONG_STANDALONE) A style specifier for [getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale)) and [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) indicating a long name used independently, such as a month name as calendar headers. | | `int` | [MARCH](https://developer.android.com/reference/java/util/Calendar#MARCH) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the third month of the year in the Gregorian and Julian calendars. | | `int` | [MAY](https://developer.android.com/reference/java/util/Calendar#MAY) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the fifth month of the year in the Gregorian and Julian calendars. | | `int` | [MILLISECOND](https://developer.android.com/reference/java/util/Calendar#MILLISECOND) Field number for `get` and `set` indicating the millisecond within the second. | | `int` | [MINUTE](https://developer.android.com/reference/java/util/Calendar#MINUTE) Field number for `get` and `set` indicating the minute within the hour. | | `int` | [MONDAY](https://developer.android.com/reference/java/util/Calendar#MONDAY) Value of the [DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) field indicating Monday. | | `int` | [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) Field number for `get` and `set` indicating the month. | | `int` | [NARROW_FORMAT](https://developer.android.com/reference/java/util/Calendar#NARROW_FORMAT) A style specifier for [getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale)) and [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) indicating a narrow name used for format. | | `int` | [NARROW_STANDALONE](https://developer.android.com/reference/java/util/Calendar#NARROW_STANDALONE) A style specifier for [getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale)) and [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) indicating a narrow name independently. | | `int` | [NOVEMBER](https://developer.android.com/reference/java/util/Calendar#NOVEMBER) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the eleventh month of the year in the Gregorian and Julian calendars. | | `int` | [OCTOBER](https://developer.android.com/reference/java/util/Calendar#OCTOBER) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the tenth month of the year in the Gregorian and Julian calendars. | | `int` | [PM](https://developer.android.com/reference/java/util/Calendar#PM) Value of the [AM_PM](https://developer.android.com/reference/java/util/Calendar#AM_PM) field indicating the period of the day from noon to just before midnight. | | `int` | [SATURDAY](https://developer.android.com/reference/java/util/Calendar#SATURDAY) Value of the [DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) field indicating Saturday. | | `int` | [SECOND](https://developer.android.com/reference/java/util/Calendar#SECOND) Field number for `get` and `set` indicating the second within the minute. | | `int` | [SEPTEMBER](https://developer.android.com/reference/java/util/Calendar#SEPTEMBER) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the ninth month of the year in the Gregorian and Julian calendars. | | `int` | [SHORT](https://developer.android.com/reference/java/util/Calendar#SHORT) A style specifier for [getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale)) and [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) equivalent to [SHORT_FORMAT](https://developer.android.com/reference/java/util/Calendar#SHORT_FORMAT). | | `int` | [SHORT_FORMAT](https://developer.android.com/reference/java/util/Calendar#SHORT_FORMAT) A style specifier for [getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale)) and [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) indicating a short name used for format. | | `int` | [SHORT_STANDALONE](https://developer.android.com/reference/java/util/Calendar#SHORT_STANDALONE) A style specifier for [getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale)) and [getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale)) indicating a short name used independently, such as a month abbreviation as calendar headers. | | `int` | [SUNDAY](https://developer.android.com/reference/java/util/Calendar#SUNDAY) Value of the [DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) field indicating Sunday. | | `int` | [THURSDAY](https://developer.android.com/reference/java/util/Calendar#THURSDAY) Value of the [DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) field indicating Thursday. | | `int` | [TUESDAY](https://developer.android.com/reference/java/util/Calendar#TUESDAY) Value of the [DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) field indicating Tuesday. | | `int` | [UNDECIMBER](https://developer.android.com/reference/java/util/Calendar#UNDECIMBER) Value of the [MONTH](https://developer.android.com/reference/java/util/Calendar#MONTH) field indicating the thirteenth month of the year. | | `int` | [WEDNESDAY](https://developer.android.com/reference/java/util/Calendar#WEDNESDAY) Value of the [DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) field indicating Wednesday. | | `int` | [WEEK_OF_MONTH](https://developer.android.com/reference/java/util/Calendar#WEEK_OF_MONTH) Field number for `get` and `set` indicating the week number within the current month. | | `int` | [WEEK_OF_YEAR](https://developer.android.com/reference/java/util/Calendar#WEEK_OF_YEAR) Field number for `get` and `set` indicating the week number within the current year. | | `int` | [YEAR](https://developer.android.com/reference/java/util/Calendar#YEAR) Field number for `get` and `set` indicating the year. | | `int` | [ZONE_OFFSET](https://developer.android.com/reference/java/util/Calendar#ZONE_OFFSET) Field number for `get` and `set` indicating the raw offset from GMT in milliseconds. | |
| ### Inherited fields |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From class [java.util.Calendar](https://developer.android.com/reference/java/util/Calendar) |------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` protected boolean` | [areFieldsSet](https://developer.android.com/reference/java/util/Calendar#areFieldsSet) True if `fields[]` are in sync with the currently set time. | | ` protected int[]` | [fields](https://developer.android.com/reference/java/util/Calendar#fields) The calendar field values for the currently set time for this calendar. | | ` protected boolean[]` | [isSet](https://developer.android.com/reference/java/util/Calendar#isSet) The flags which tell if a specified calendar field for the calendar is set. | | ` protected boolean` | [isTimeSet](https://developer.android.com/reference/java/util/Calendar#isTimeSet) True if then the value of `time` is valid. | | ` protected long` | [time](https://developer.android.com/reference/java/util/Calendar#time) The currently set time for this calendar, expressed in milliseconds after January 1, 1970, 0:00:00 GMT. | |
| ### Public constructors ||
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| ` `[GregorianCalendar](https://developer.android.com/reference/java/util/GregorianCalendar#GregorianCalendar())`() ` Constructs a default `GregorianCalendar` using the current time in the default time zone with the default [FORMAT](https://developer.android.com/reference/java/util/Locale.Category#FORMAT) locale. |
| ` `[GregorianCalendar](https://developer.android.com/reference/java/util/GregorianCalendar#GregorianCalendar(int,%20int,%20int))`(int year, int month, int dayOfMonth) ` Constructs a `GregorianCalendar` with the given date set in the default time zone with the default locale. |
| ` `[GregorianCalendar](https://developer.android.com/reference/java/util/GregorianCalendar#GregorianCalendar(int,%20int,%20int,%20int,%20int))`(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](https://developer.android.com/reference/java/util/GregorianCalendar#GregorianCalendar(int,%20int,%20int,%20int,%20int,%20int))`(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](https://developer.android.com/reference/java/util/GregorianCalendar#GregorianCalendar(java.util.Locale))`(`[Locale](https://developer.android.com/reference/java/util/Locale)` aLocale) ` Constructs a `GregorianCalendar` based on the current time in the default time zone with the given locale. |
| ` `[GregorianCalendar](https://developer.android.com/reference/java/util/GregorianCalendar#GregorianCalendar(java.util.TimeZone))`(`[TimeZone](https://developer.android.com/reference/java/util/TimeZone)` zone) ` Constructs a `GregorianCalendar` based on the current time in the given time zone with the default [FORMAT](https://developer.android.com/reference/java/util/Locale.Category#FORMAT) locale. |
| ` `[GregorianCalendar](https://developer.android.com/reference/java/util/GregorianCalendar#GregorianCalendar(java.util.TimeZone,%20java.util.Locale))`(`[TimeZone](https://developer.android.com/reference/java/util/TimeZone)` zone, `[Locale](https://developer.android.com/reference/java/util/Locale)` aLocale) ` Constructs a `GregorianCalendar` based on the current time in the given time zone with the given locale. |
| ### Public methods ||
|----------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` void` | ` `[add](https://developer.android.com/reference/java/util/GregorianCalendar#add(int,%20int))`(int field, int amount) ` Adds the specified (signed) amount of time to the given calendar field, based on the calendar's rules. |
| ` `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[clone](https://developer.android.com/reference/java/util/GregorianCalendar#clone())`() ` Creates and returns a copy of this object. |
| ` boolean` | ` `[equals](https://developer.android.com/reference/java/util/GregorianCalendar#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` obj) ` Compares this `GregorianCalendar` to the specified `Object`. |
| ` static `[GregorianCalendar](https://developer.android.com/reference/java/util/GregorianCalendar) | ` `[from](https://developer.android.com/reference/java/util/GregorianCalendar#from(java.time.ZonedDateTime))`(`[ZonedDateTime](https://developer.android.com/reference/java/time/ZonedDateTime)` zdt) ` Obtains an instance of `GregorianCalendar` with the default locale from a `ZonedDateTime` object. |
| ` int` | ` `[getActualMaximum](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int))`(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](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()), [getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()), [getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange()) and [getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone()) methods. |
| ` int` | ` `[getActualMinimum](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMinimum(int))`(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](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()), [getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()), [getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange()) and [getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone()) methods. |
| ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[getCalendarType](https://developer.android.com/reference/java/util/GregorianCalendar#getCalendarType())`() ` Returns `"gregory"` as the calendar type. |
| ` int` | ` `[getGreatestMinimum](https://developer.android.com/reference/java/util/GregorianCalendar#getGreatestMinimum(int))`(int field) ` Returns the highest minimum value for the given calendar field of this `GregorianCalendar` instance. |
| ` final `[Date](https://developer.android.com/reference/java/util/Date) | ` `[getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange())`() ` Gets the Gregorian Calendar change date. |
| ` int` | ` `[getLeastMaximum](https://developer.android.com/reference/java/util/GregorianCalendar#getLeastMaximum(int))`(int field) ` Returns the lowest maximum value for the given calendar field of this `GregorianCalendar` instance. |
| ` int` | ` `[getMaximum](https://developer.android.com/reference/java/util/GregorianCalendar#getMaximum(int))`(int field) ` Returns the maximum value for the given calendar field of this `GregorianCalendar` instance. |
| ` int` | ` `[getMinimum](https://developer.android.com/reference/java/util/GregorianCalendar#getMinimum(int))`(int field) ` Returns the minimum value for the given calendar field of this `GregorianCalendar` instance. |
| ` `[TimeZone](https://developer.android.com/reference/java/util/TimeZone) | ` `[getTimeZone](https://developer.android.com/reference/java/util/GregorianCalendar#getTimeZone())`() ` Gets the time zone. |
| ` int` | ` `[getWeekYear](https://developer.android.com/reference/java/util/GregorianCalendar#getWeekYear())`() ` Returns the [week year](https://developer.android.com/reference/java/util/GregorianCalendar#week_year) represented by this `GregorianCalendar`. |
| ` int` | ` `[getWeeksInWeekYear](https://developer.android.com/reference/java/util/GregorianCalendar#getWeeksInWeekYear())`() ` Returns the number of weeks in the [week year](https://developer.android.com/reference/java/util/GregorianCalendar#week_year) represented by this `GregorianCalendar`. |
| ` int` | ` `[hashCode](https://developer.android.com/reference/java/util/GregorianCalendar#hashCode())`() ` Generates the hash code for this `GregorianCalendar` object. |
| ` boolean` | ` `[isLeapYear](https://developer.android.com/reference/java/util/GregorianCalendar#isLeapYear(int))`(int year) ` Determines if the given year is a leap year. |
| ` final boolean` | ` `[isWeekDateSupported](https://developer.android.com/reference/java/util/GregorianCalendar#isWeekDateSupported())`() ` Returns `true` indicating this `GregorianCalendar` supports week dates. |
| ` void` | ` `[roll](https://developer.android.com/reference/java/util/GregorianCalendar#roll(int,%20boolean))`(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](https://developer.android.com/reference/java/util/GregorianCalendar#roll(int,%20int))`(int field, int amount) ` Adds a signed amount to the specified calendar field without changing larger fields. |
| ` void` | ` `[setGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#setGregorianChange(java.util.Date))`(`[Date](https://developer.android.com/reference/java/util/Date)` date) ` Sets the `GregorianCalendar` change date. |
| ` void` | ` `[setTimeZone](https://developer.android.com/reference/java/util/GregorianCalendar#setTimeZone(java.util.TimeZone))`(`[TimeZone](https://developer.android.com/reference/java/util/TimeZone)` zone) ` Sets the time zone with the given time zone value. |
| ` void` | ` `[setWeekDate](https://developer.android.com/reference/java/util/GregorianCalendar#setWeekDate(int,%20int,%20int))`(int weekYear, int weekOfYear, int dayOfWeek) ` Sets this `GregorianCalendar` to the date given by the date specifiers - [`weekYear`](https://developer.android.com/reference/java/util/GregorianCalendar#week_year), `weekOfYear`, and `dayOfWeek`. |
| ` `[ZonedDateTime](https://developer.android.com/reference/java/time/ZonedDateTime) | ` `[toZonedDateTime](https://developer.android.com/reference/java/util/GregorianCalendar#toZonedDateTime())`() ` Converts this object to a `ZonedDateTime` that represents the same point on the time-line as this `GregorianCalendar`. |
| ### Protected methods ||
|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` void` | ` `[computeFields](https://developer.android.com/reference/java/util/GregorianCalendar#computeFields())`() ` Converts the time value (millisecond offset from the [Epoch](https://developer.android.com/reference/java/util/Calendar#Epoch)) to calendar field values. |
| ` void` | ` `[computeTime](https://developer.android.com/reference/java/util/GregorianCalendar#computeTime())`() ` Converts calendar field values to the time value (millisecond offset from the [Epoch](https://developer.android.com/reference/java/util/Calendar#Epoch)). |
| ### Inherited methods |
|-----------------------|---|
| From class ` `[java.util.Calendar](https://developer.android.com/reference/java/util/Calendar)` ` |-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` abstract void` | ` `[add](https://developer.android.com/reference/java/util/Calendar#add(int,%20int))`(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](https://developer.android.com/reference/java/util/Calendar#after(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` when) ` Returns whether this `Calendar` represents a time after the time represented by the specified `Object`. | | ` boolean` | ` `[before](https://developer.android.com/reference/java/util/Calendar#before(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` when) ` Returns whether this `Calendar` represents a time before the time represented by the specified `Object`. | | ` final void` | ` `[clear](https://developer.android.com/reference/java/util/Calendar#clear())`() ` Sets all the calendar field values and the time value (millisecond offset from the [Epoch](https://developer.android.com/reference/java/util/GregorianCalendar#Epoch)) of this `Calendar` undefined. | | ` final void` | ` `[clear](https://developer.android.com/reference/java/util/Calendar#clear(int))`(int field) ` Sets the given calendar field value and the time value (millisecond offset from the [Epoch](https://developer.android.com/reference/java/util/GregorianCalendar#Epoch)) of this `Calendar` undefined. | | ` `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[clone](https://developer.android.com/reference/java/util/Calendar#clone())`() ` Creates and returns a copy of this object. | | ` int` | ` `[compareTo](https://developer.android.com/reference/java/util/Calendar#compareTo(java.util.Calendar))`(`[Calendar](https://developer.android.com/reference/java/util/Calendar)` anotherCalendar) ` Compares the time values (millisecond offsets from the [Epoch](https://developer.android.com/reference/java/util/GregorianCalendar#Epoch)) represented by two `Calendar` objects. | | ` void` | ` `[complete](https://developer.android.com/reference/java/util/Calendar#complete())`() ` Fills in any unset fields in the calendar fields. | | ` abstract void` | ` `[computeFields](https://developer.android.com/reference/java/util/Calendar#computeFields())`() ` Converts the current millisecond time value [time](https://developer.android.com/reference/java/util/Calendar#time) to calendar field values in [fields[]](https://developer.android.com/reference/java/util/Calendar#fields). | | ` abstract void` | ` `[computeTime](https://developer.android.com/reference/java/util/Calendar#computeTime())`() ` Converts the current calendar field values in [fields[]](https://developer.android.com/reference/java/util/Calendar#fields) to the millisecond time value [time](https://developer.android.com/reference/java/util/Calendar#time). | | ` boolean` | ` `[equals](https://developer.android.com/reference/java/util/Calendar#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` obj) ` Compares this `Calendar` to the specified `Object`. | | ` int` | ` `[get](https://developer.android.com/reference/java/util/Calendar#get(int))`(int field) ` Returns the value of the given calendar field. | | ` int` | ` `[getActualMaximum](https://developer.android.com/reference/java/util/Calendar#getActualMaximum(int))`(int field) ` Returns the maximum value that the specified calendar field could have, given the time value of this `Calendar`. | | ` int` | ` `[getActualMinimum](https://developer.android.com/reference/java/util/Calendar#getActualMinimum(int))`(int field) ` Returns the minimum value that the specified calendar field could have, given the time value of this `Calendar`. | | ` static `[Set](https://developer.android.com/reference/java/util/Set)`<`[String](https://developer.android.com/reference/java/lang/String)`>` | ` `[getAvailableCalendarTypes](https://developer.android.com/reference/java/util/Calendar#getAvailableCalendarTypes())`() ` Returns an unmodifiable `Set` containing all calendar types supported by `Calendar` in the runtime environment. | | ` static `[Locale[]](https://developer.android.com/reference/java/util/Locale) | ` `[getAvailableLocales](https://developer.android.com/reference/java/util/Calendar#getAvailableLocales())`() ` Returns an array of all locales for which the `getInstance` methods of this class can return localized instances. | | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[getCalendarType](https://developer.android.com/reference/java/util/Calendar#getCalendarType())`() ` Returns the calendar type of this `Calendar`. | | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[getDisplayName](https://developer.android.com/reference/java/util/Calendar#getDisplayName(int,%20int,%20java.util.Locale))`(int field, int style, `[Locale](https://developer.android.com/reference/java/util/Locale)` locale) ` Returns the string representation of the calendar `field` value in the given `style` and `locale`. | | ` `[Map](https://developer.android.com/reference/java/util/Map)`<`[String](https://developer.android.com/reference/java/lang/String)`, `[Integer](https://developer.android.com/reference/java/lang/Integer)`>` | ` `[getDisplayNames](https://developer.android.com/reference/java/util/Calendar#getDisplayNames(int,%20int,%20java.util.Locale))`(int field, int style, `[Locale](https://developer.android.com/reference/java/util/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](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek())`() ` Gets what the first day of the week is; e.g., `SUNDAY` in the U.S., `MONDAY` in France. | | ` abstract int` | ` `[getGreatestMinimum](https://developer.android.com/reference/java/util/Calendar#getGreatestMinimum(int))`(int field) ` Returns the highest minimum value for the given calendar field of this `Calendar` instance. | | ` static `[Calendar](https://developer.android.com/reference/java/util/Calendar) | ` `[getInstance](https://developer.android.com/reference/java/util/Calendar#getInstance())`() ` Gets a calendar using the default time zone and locale. | | ` static `[Calendar](https://developer.android.com/reference/java/util/Calendar) | ` `[getInstance](https://developer.android.com/reference/java/util/Calendar#getInstance(java.util.Locale))`(`[Locale](https://developer.android.com/reference/java/util/Locale)` aLocale) ` Gets a calendar using the default time zone and specified locale. | | ` static `[Calendar](https://developer.android.com/reference/java/util/Calendar) | ` `[getInstance](https://developer.android.com/reference/java/util/Calendar#getInstance(java.util.TimeZone,%20java.util.Locale))`(`[TimeZone](https://developer.android.com/reference/java/util/TimeZone)` zone, `[Locale](https://developer.android.com/reference/java/util/Locale)` aLocale) ` Gets a calendar with the specified time zone and locale. | | ` static `[Calendar](https://developer.android.com/reference/java/util/Calendar) | ` `[getInstance](https://developer.android.com/reference/java/util/Calendar#getInstance(java.util.TimeZone))`(`[TimeZone](https://developer.android.com/reference/java/util/TimeZone)` zone) ` Gets a calendar using the specified time zone and default locale. | | ` abstract int` | ` `[getLeastMaximum](https://developer.android.com/reference/java/util/Calendar#getLeastMaximum(int))`(int field) ` Returns the lowest maximum value for the given calendar field of this `Calendar` instance. | | ` abstract int` | ` `[getMaximum](https://developer.android.com/reference/java/util/Calendar#getMaximum(int))`(int field) ` Returns the maximum value for the given calendar field of this `Calendar` instance. | | ` int` | ` `[getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#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](https://developer.android.com/reference/java/util/Calendar#getMinimum(int))`(int field) ` Returns the minimum value for the given calendar field of this `Calendar` instance. | | ` final `[Date](https://developer.android.com/reference/java/util/Date) | ` `[getTime](https://developer.android.com/reference/java/util/Calendar#getTime())`() ` Returns a `Date` object representing this `Calendar`'s time value (millisecond offset from the [Epoch](https://developer.android.com/reference/java/util/GregorianCalendar#Epoch)"). | | ` long` | ` `[getTimeInMillis](https://developer.android.com/reference/java/util/Calendar#getTimeInMillis())`() ` Returns this Calendar's time value in milliseconds. | | ` `[TimeZone](https://developer.android.com/reference/java/util/TimeZone) | ` `[getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone())`() ` Gets the time zone. | | ` int` | ` `[getWeekYear](https://developer.android.com/reference/java/util/Calendar#getWeekYear())`() ` Returns the week year represented by this `Calendar`. | | ` int` | ` `[getWeeksInWeekYear](https://developer.android.com/reference/java/util/Calendar#getWeeksInWeekYear())`() ` Returns the number of weeks in the week year represented by this `Calendar`. | | ` int` | ` `[hashCode](https://developer.android.com/reference/java/util/Calendar#hashCode())`() ` Returns a hash code for this calendar. | | ` final int` | ` `[internalGet](https://developer.android.com/reference/java/util/Calendar#internalGet(int))`(int field) ` Returns the value of the given calendar field. | | ` boolean` | ` `[isLenient](https://developer.android.com/reference/java/util/Calendar#isLenient())`() ` Tells whether date/time interpretation is to be lenient. | | ` final boolean` | ` `[isSet](https://developer.android.com/reference/java/util/Calendar#isSet(int))`(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](https://developer.android.com/reference/java/util/Calendar#isWeekDateSupported())`() ` Returns whether this `Calendar` supports week dates. | | ` abstract void` | ` `[roll](https://developer.android.com/reference/java/util/Calendar#roll(int,%20boolean))`(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](https://developer.android.com/reference/java/util/Calendar#roll(int,%20int))`(int field, int amount) ` Adds the specified (signed) amount to the specified calendar field without changing larger fields. | | ` final void` | ` `[set](https://developer.android.com/reference/java/util/Calendar#set(int,%20int,%20int,%20int,%20int,%20int))`(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](https://developer.android.com/reference/java/util/Calendar#set(int,%20int,%20int,%20int,%20int))`(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](https://developer.android.com/reference/java/util/Calendar#set(int,%20int))`(int field, int value) ` Sets the given calendar field to the given value. | | ` final void` | ` `[set](https://developer.android.com/reference/java/util/Calendar#set(int,%20int,%20int))`(int year, int month, int date) ` Sets the values for the calendar fields `YEAR`, `MONTH`, and `DAY_OF_MONTH`. | | ` void` | ` `[setFirstDayOfWeek](https://developer.android.com/reference/java/util/Calendar#setFirstDayOfWeek(int))`(int value) ` Sets what the first day of the week is; e.g., `SUNDAY` in the U.S., `MONDAY` in France. | | ` void` | ` `[setLenient](https://developer.android.com/reference/java/util/Calendar#setLenient(boolean))`(boolean lenient) ` Specifies whether or not date/time interpretation is to be lenient. | | ` void` | ` `[setMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#setMinimalDaysInFirstWeek(int))`(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](https://developer.android.com/reference/java/util/Calendar#setTime(java.util.Date))`(`[Date](https://developer.android.com/reference/java/util/Date)` date) ` Sets this Calendar's time with the given `Date`. | | ` void` | ` `[setTimeInMillis](https://developer.android.com/reference/java/util/Calendar#setTimeInMillis(long))`(long millis) ` Sets this Calendar's current time from the given long value. | | ` void` | ` `[setTimeZone](https://developer.android.com/reference/java/util/Calendar#setTimeZone(java.util.TimeZone))`(`[TimeZone](https://developer.android.com/reference/java/util/TimeZone)` value) ` Sets the time zone with the given time zone value. | | ` void` | ` `[setWeekDate](https://developer.android.com/reference/java/util/Calendar#setWeekDate(int,%20int,%20int))`(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](https://developer.android.com/reference/java/time/Instant) | ` `[toInstant](https://developer.android.com/reference/java/util/Calendar#toInstant())`() ` Converts this object to an [Instant](https://developer.android.com/reference/java/time/Instant). | | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[toString](https://developer.android.com/reference/java/util/Calendar#toString())`() ` Return a string representation of this calendar. | ||
| From class ` `[java.lang.Object](https://developer.android.com/reference/java/lang/Object)` ` |--------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[clone](https://developer.android.com/reference/java/lang/Object#clone())`() ` Creates and returns a copy of this object. | | ` boolean` | ` `[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` `[finalize](https://developer.android.com/reference/java/lang/Object#finalize())`() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final `[Class](https://developer.android.com/reference/java/lang/Class)`` | ` `[getClass](https://developer.android.com/reference/java/lang/Object#getClass())`() ` Returns the runtime class of this `Object`. | | ` int` | ` `[hashCode](https://developer.android.com/reference/java/lang/Object#hashCode())`() ` Returns a hash code value for the object. | | ` final void` | ` `[notify](https://developer.android.com/reference/java/lang/Object#notify())`() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` `[notifyAll](https://developer.android.com/reference/java/lang/Object#notifyAll())`() ` Wakes up all threads that are waiting on this object's monitor. | | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[toString](https://developer.android.com/reference/java/lang/Object#toString())`() ` Returns a string representation of the object. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait(long,%20int))`(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](https://developer.android.com/reference/java/lang/Object#wait(long))`(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](https://developer.android.com/reference/java/lang/Object#wait())`() ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*. | ||
| From interface ` `[java.lang.Comparable](https://developer.android.com/reference/java/lang/Comparable)` ` |-----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` abstract int` | ` `[compareTo](https://developer.android.com/reference/java/lang/Comparable#compareTo(T))`(`[Calendar](https://developer.android.com/reference/java/util/Calendar)` o) ` Compares this object with the specified object for order. | ||
## Constants
### AD
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int AD
```
Value of the `ERA` field indicating
the common era (Anno Domini), also known as CE.
The sequence of years at the transition from `BC` to `AD` is
..., 2 BC, 1 BC, 1 AD, 2 AD,...
**See also:**
- [Calendar.ERA](https://developer.android.com/reference/java/util/Calendar#ERA)
Constant Value:
1
(0x00000001)
### BC
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int BC
```
Value of the `ERA` field indicating
the period before the common era (before Christ), also known as BCE.
The sequence of years at the transition from `BC` to `AD` is
..., 2 BC, 1 BC, 1 AD, 2 AD,...
**See also:**
- [Calendar.ERA](https://developer.android.com/reference/java/util/Calendar#ERA)
Constant Value:
0
(0x00000000)
## Public constructors
### GregorianCalendar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public GregorianCalendar ()
```
Constructs a default `GregorianCalendar` using the current time
in the default time zone with the default
[FORMAT](https://developer.android.com/reference/java/util/Locale.Category#FORMAT) locale.
### GregorianCalendar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public GregorianCalendar (int year,
int month,
int dayOfMonth)
```
Constructs a `GregorianCalendar` with the given date set
in the default time zone with the default locale.
| 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.
|
### GregorianCalendar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public 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.
| 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.
|
| `hourOfDay` | `int`: the value used to set the `HOUR_OF_DAY` calendar field in the calendar.
|
| `minute` | `int`: the value used to set the `MINUTE` calendar field in the calendar.
|
### GregorianCalendar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public 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.
| 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.
|
| `hourOfDay` | `int`: the value used to set the `HOUR_OF_DAY` calendar field in the calendar.
|
| `minute` | `int`: the value used to set the `MINUTE` calendar field in the calendar.
|
| `second` | `int`: the value used to set the `SECOND` calendar field in the calendar.
|
### GregorianCalendar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public GregorianCalendar (Locale aLocale)
```
Constructs a `GregorianCalendar` based on the current time
in the default time zone with the given locale.
| Parameters ||
|-----------|------------------------------------|
| `aLocale` | `Locale`: the given locale.
|
### GregorianCalendar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public GregorianCalendar (TimeZone zone)
```
Constructs a `GregorianCalendar` based on the current time
in the given time zone with the default
[FORMAT](https://developer.android.com/reference/java/util/Locale.Category#FORMAT) locale.
| Parameters ||
|--------|-----------------------------------------|
| `zone` | `TimeZone`: the given time zone.
|
### GregorianCalendar
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public GregorianCalendar (TimeZone zone,
Locale aLocale)
```
Constructs a `GregorianCalendar` 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.
|
## Public methods
### add
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void add (int field,
int amount)
```
Adds the specified (signed) amount of time to the given calendar field,
based on the calendar's rules.
*Add rule 1* . The value of `field`
after the call minus the value of `field` before the
call is `amount`, modulo any overflow that has occurred in
`field`. Overflow occurs when a field value exceeds its
range and, as a result, the next larger field is incremented or
decremented and the field value is adjusted back into its range.
*Add rule 2* . If a smaller field is expected to be
invariant, but it is impossible for it to be equal to its
prior value because of changes in its minimum or maximum after
`field` is changed, then its value is adjusted to be as close
as possible to its expected value. A smaller field represents a
smaller unit of time. `HOUR` is a smaller field than
`DAY_OF_MONTH`. No adjustment is made to smaller fields
that are not expected to be invariant. The calendar system
determines what fields are expected to be invariant.
| Parameters ||
|----------|--------------------------------------------------------------------|
| `field` | `int`: the calendar field.
|
| `amount` | `int`: the amount of date or time to be added to the field.
|
| Throws ||
|--------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------|
| [IllegalArgumentException](https://developer.android.com/reference/java/lang/IllegalArgumentException) | if `field` is `ZONE_OFFSET`, `DST_OFFSET`, or unknown, or if any calendar fields have out-of-range values in non-lenient mode. |
### clone
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public Object clone ()
```
Creates and returns a copy of this object.
| Returns ||
|--------------------------------------------------------------------|-------------------------------|
| [Object](https://developer.android.com/reference/java/lang/Object) | a copy of this object.
|
### equals
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean equals (Object obj)
```
Compares this `GregorianCalendar` to the specified
`Object`. The result is `true` if and
only if the argument is a `GregorianCalendar` object
that represents the same time value (millisecond offset from
the [Epoch](https://developer.android.com/reference/java/util/Calendar#Epoch)) under the same
`Calendar` parameters and Gregorian change date as
this object.
| Parameters ||
|-------|----------------------------------------------|
| `obj` | `Object`: the object to compare with.
|
| Returns ||
|-----------|--------------------------------------------------------------------|
| `boolean` | `true` if this object is equal to `obj`; `false` otherwise.
|
**See also:**
- [Calendar.compareTo(Calendar)](https://developer.android.com/reference/java/util/Calendar#compareTo(java.util.Calendar))
### from
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static GregorianCalendar from (ZonedDateTime zdt)
```
Obtains an instance of `GregorianCalendar` with the default locale
from a `ZonedDateTime` object.
Since `ZonedDateTime` does not support a Julian-Gregorian cutover
date and uses ISO calendar system, the return GregorianCalendar is a pure
Gregorian calendar and uses ISO 8601 standard for week definitions,
which has `MONDAY` as the [FirstDayOfWeek](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()) and `4` as the value of the
[MinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()).
`ZoneDateTime` can store points on the time-line further in the
future and further in the past than `GregorianCalendar`. In this
scenario, this method will throw an `IllegalArgumentException`
exception.
| Parameters ||
|-------|---------------------------------------------------------------|
| `zdt` | `ZonedDateTime`: the zoned date-time object to convert
|
| Returns ||
|------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------|
| [GregorianCalendar](https://developer.android.com/reference/java/util/GregorianCalendar) | the gregorian calendar representing the same point on the time-line as the zoned date-time provided
|
| Throws ||
|--------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------|
| [NullPointerException](https://developer.android.com/reference/java/lang/NullPointerException) | if `zdt` is null |
| [IllegalArgumentException](https://developer.android.com/reference/java/lang/IllegalArgumentException) | if the zoned date-time is too large to represent as a `GregorianCalendar` |
### getActualMaximum
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public 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](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()),
[getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()),
[getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange()) and
[getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone()) methods.
For example, if the date of this instance is February 1, 2004,
the actual maximum value of the `DAY_OF_MONTH` field
is 29 because 2004 is a leap year, and if the date of this
instance is February 1, 2005, it's 28.
This method calculates the maximum value of [WEEK_OF_YEAR](https://developer.android.com/reference/java/util/Calendar#WEEK_OF_YEAR) based on the [YEAR](https://developer.android.com/reference/java/util/Calendar#YEAR) (calendar year) value, not the [week year](https://developer.android.com/reference/java/util/GregorianCalendar#week_year). Call [getWeeksInWeekYear()](https://developer.android.com/reference/java/util/GregorianCalendar#getWeeksInWeekYear()) to get the maximum value of `WEEK_OF_YEAR` in the week year of this `GregorianCalendar`.
| Parameters ||
|---------|----------------------------------|
| `field` | `int`: the calendar field
|
| Returns ||
|-------|--------------------------------------------------------------------------------------|
| `int` | the maximum of the given field for the time value of this `GregorianCalendar`
|
**See also:**
- [getMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMinimum(int))
- [getMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMaximum(int))
- [getGreatestMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getGreatestMinimum(int))
- [getLeastMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getLeastMaximum(int))
- [getActualMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMinimum(int))
### getActualMinimum
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public 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](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()),
[getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()),
[getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange()) and
[getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone()) methods.
For example, if the Gregorian change date is January 10,
1970 and the date of this `GregorianCalendar` is
January 20, 1970, the actual minimum value of the
`DAY_OF_MONTH` field is 10 because the previous date
of January 10, 1970 is December 27, 1996 (in the Julian
calendar). Therefore, December 28, 1969 to January 9, 1970
don't exist.
| Parameters ||
|---------|----------------------------------|
| `field` | `int`: the calendar field
|
| Returns ||
|-------|--------------------------------------------------------------------------------------|
| `int` | the minimum of the given field for the time value of this `GregorianCalendar`
|
**See also:**
- [getMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMinimum(int))
- [getMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMaximum(int))
- [getGreatestMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getGreatestMinimum(int))
- [getLeastMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getLeastMaximum(int))
- [getActualMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int))
### getCalendarType
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public String getCalendarType ()
```
Returns `"gregory"` as the calendar type.
| Returns ||
|--------------------------------------------------------------------|--------------------|
| [String](https://developer.android.com/reference/java/lang/String) | `"gregory"`
|
### getGreatestMinimum
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getGreatestMinimum (int field)
```
Returns the highest minimum value for the given calendar field
of this `GregorianCalendar` instance. The highest
minimum value is defined as the largest value returned by
[getActualMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMinimum(int)) for any possible time value,
taking into consideration the current values of the
[getFirstDayOfWeek](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()),
[getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()),
[getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange()) and
[getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone()) methods.
| Parameters ||
|---------|-----------------------------------|
| `field` | `int`: the calendar field.
|
| Returns ||
|-------|----------------------------------------------------------------|
| `int` | the highest minimum value for the given calendar field.
|
**See also:**
- [getMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMinimum(int))
- [getMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMaximum(int))
- [getLeastMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getLeastMaximum(int))
- [getActualMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMinimum(int))
- [getActualMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int))
### getGregorianChange
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public final Date getGregorianChange ()
```
Gets the Gregorian Calendar change date. This is the point when the
switch from Julian dates to Gregorian dates occurred. Default is
October 15, 1582 (Gregorian). Previous to this, dates will be in the Julian
calendar.
| Returns ||
|----------------------------------------------------------------|------------------------------------------------------------------------|
| [Date](https://developer.android.com/reference/java/util/Date) | the Gregorian cutover date for this `GregorianCalendar` object.
|
### getLeastMaximum
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getLeastMaximum (int field)
```
Returns the lowest maximum value for the given calendar field
of this `GregorianCalendar` instance. The lowest
maximum value is defined as the smallest value returned by
[getActualMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int)) for any possible time value,
taking into consideration the current values of the
[getFirstDayOfWeek](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()),
[getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()),
[getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange()) and
[getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone()) methods.
| Parameters ||
|---------|----------------------------------|
| `field` | `int`: the calendar field
|
| Returns ||
|-------|---------------------------------------------------------------|
| `int` | the lowest maximum value for the given calendar field.
|
**See also:**
- [getMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMinimum(int))
- [getMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMaximum(int))
- [getGreatestMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getGreatestMinimum(int))
- [getActualMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMinimum(int))
- [getActualMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int))
### getMaximum
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getMaximum (int field)
```
Returns the maximum value for the given calendar field of this
`GregorianCalendar` instance. The maximum value is
defined as the largest value returned by the [get](https://developer.android.com/reference/java/util/Calendar#get(int)) method for any possible time value,
taking into consideration the current values of the
[getFirstDayOfWeek](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()),
[getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()),
[getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange()) and
[getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone()) methods.
| Parameters ||
|---------|-----------------------------------|
| `field` | `int`: the calendar field.
|
| Returns ||
|-------|--------------------------------------------------------|
| `int` | the maximum value for the given calendar field.
|
**See also:**
- [getMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMinimum(int))
- [getGreatestMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getGreatestMinimum(int))
- [getLeastMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getLeastMaximum(int))
- [getActualMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMinimum(int))
- [getActualMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int))
### getMinimum
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getMinimum (int field)
```
Returns the minimum value for the given calendar field of this
`GregorianCalendar` instance. The minimum value is
defined as the smallest value returned by the [get](https://developer.android.com/reference/java/util/Calendar#get(int)) method for any possible time value,
taking into consideration the current values of the
[getFirstDayOfWeek](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek()),
[getMinimalDaysInFirstWeek](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek()),
[getGregorianChange](https://developer.android.com/reference/java/util/GregorianCalendar#getGregorianChange()) and
[getTimeZone](https://developer.android.com/reference/java/util/Calendar#getTimeZone()) methods.
| Parameters ||
|---------|-----------------------------------|
| `field` | `int`: the calendar field.
|
| Returns ||
|-------|--------------------------------------------------------|
| `int` | the minimum value for the given calendar field.
|
**See also:**
- [getMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getMaximum(int))
- [getGreatestMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getGreatestMinimum(int))
- [getLeastMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getLeastMaximum(int))
- [getActualMinimum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMinimum(int))
- [getActualMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int))
### getTimeZone
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public TimeZone getTimeZone ()
```
Gets the time zone.
| Returns ||
|------------------------------------------------------------------------|------------------------------------------------------------|
| [TimeZone](https://developer.android.com/reference/java/util/TimeZone) | the time zone object associated with this calendar.
|
### getWeekYear
Added in [API level 24](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getWeekYear ()
```
Returns the [week year](https://developer.android.com/reference/java/util/GregorianCalendar#week_year) represented by this
`GregorianCalendar`. The dates in the weeks between 1 and the
maximum week number of the week year have the same week year value
that may be one year before or after the [YEAR](https://developer.android.com/reference/java/util/Calendar#YEAR)
(calendar year) value.
This method calls [Calendar.complete()](https://developer.android.com/reference/java/util/Calendar#complete()) before
calculating the week year.
| Returns ||
|-------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `int` | the week year represented by this `GregorianCalendar`. If the [ERA](https://developer.android.com/reference/java/util/Calendar#ERA) value is [BC](https://developer.android.com/reference/java/util/GregorianCalendar#BC), the year is represented by 0 or a negative number: BC 1 is 0, BC 2 is -1, BC 3 is -2, and so on.
|
| Throws ||
|--------------------------------------------------------------------------------------------------------|---------------------------------------------------------------|
| [IllegalArgumentException](https://developer.android.com/reference/java/lang/IllegalArgumentException) | if any of the calendar fields is invalid in non-lenient mode. |
**See also:**
- [isWeekDateSupported()](https://developer.android.com/reference/java/util/GregorianCalendar#isWeekDateSupported())
- [getWeeksInWeekYear()](https://developer.android.com/reference/java/util/GregorianCalendar#getWeeksInWeekYear())
- [Calendar.getFirstDayOfWeek()](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek())
- [Calendar.getMinimalDaysInFirstWeek()](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek())
### getWeeksInWeekYear
Added in [API level 24](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getWeeksInWeekYear ()
```
Returns the number of weeks in the [week year](https://developer.android.com/reference/java/util/GregorianCalendar#week_year)
represented by this `GregorianCalendar`.
For example, if this `GregorianCalendar`'s date is
December 31, 2008 with [the ISO
8601 compatible setting](https://developer.android.com/reference/java/util/GregorianCalendar#iso8601_compatible_setting), this method will return 53 for the
period: December 29, 2008 to January 3, 2010 while [getActualMaximum(WEEK_OF_YEAR)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int)) will return
52 for the period: December 31, 2007 to December 28, 2008.
| Returns ||
|-------|----------------------------------------------|
| `int` | the number of weeks in the week year.
|
**See also:**
- [Calendar.WEEK_OF_YEAR](https://developer.android.com/reference/java/util/Calendar#WEEK_OF_YEAR)
- [getWeekYear()](https://developer.android.com/reference/java/util/GregorianCalendar#getWeekYear())
- [getActualMaximum(int)](https://developer.android.com/reference/java/util/GregorianCalendar#getActualMaximum(int))
### hashCode
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int hashCode ()
```
Generates the hash code for this `GregorianCalendar` object.
| Returns ||
|-------|-------------------------------------------|
| `int` | a hash code value for this object.
|
### isLeapYear
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public boolean isLeapYear (int year)
```
Determines if the given year is a leap year. Returns `true` if
the given year is a leap year. To specify BC year numbers,
`1 - year number` must be given. For example, year BC 4 is
specified as -3.
| Parameters ||
|--------|-------------------------------|
| `year` | `int`: the given year.
|
| Returns ||
|-----------|--------------------------------------------------------------------|
| `boolean` | `true` if the given year is a leap year; `false` otherwise.
|
### isWeekDateSupported
Added in [API level 24](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public final boolean isWeekDateSupported ()
```
Returns `true` indicating this `GregorianCalendar`
supports week dates.
| Returns ||
|-----------|------------------------|
| `boolean` | `true` (always)
|
**See also:**
- [getWeekYear()](https://developer.android.com/reference/java/util/GregorianCalendar#getWeekYear())
- [setWeekDate(int, int, int)](https://developer.android.com/reference/java/util/GregorianCalendar#setWeekDate(int,%20int,%20int))
- [getWeeksInWeekYear()](https://developer.android.com/reference/java/util/GregorianCalendar#getWeeksInWeekYear())
### roll
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public 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.
*Example* : Consider a `GregorianCalendar`
originally set to December 31, 1999. Calling [roll(Calendar.MONTH, true)](https://developer.android.com/reference/java/util/GregorianCalendar#roll(int,%20boolean))
sets the calendar to January 31, 1999. The `YEAR` field is unchanged
because it is a larger field than `MONTH`.
| 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.
|
| Throws ||
|--------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------|
| [IllegalArgumentException](https://developer.android.com/reference/java/lang/IllegalArgumentException) | if `field` is `ZONE_OFFSET`, `DST_OFFSET`, or unknown, or if any calendar fields have out-of-range values in non-lenient mode. |
**See also:**
- [add(int, int)](https://developer.android.com/reference/java/util/GregorianCalendar#add(int,%20int))
- [Calendar.set(int, int)](https://developer.android.com/reference/java/util/Calendar#set(int,%20int))
### roll
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void roll (int field,
int amount)
```
Adds a signed amount to the specified calendar field without changing larger fields.
A negative roll amount means to subtract from field without changing
larger fields. If the specified amount is 0, this method performs nothing.
This method calls [Calendar.complete()](https://developer.android.com/reference/java/util/Calendar#complete()) before adding the
amount so that all the calendar fields are normalized. If there
is any calendar field having an out-of-range value in non-lenient mode, then an
`IllegalArgumentException` is thrown.
*Example* : Consider a `GregorianCalendar`
originally set to August 31, 1999. Calling `roll(Calendar.MONTH,
8)` sets the calendar to April 30, **1999** . Using a
`GregorianCalendar`, the `DAY_OF_MONTH` field cannot
be 31 in the month April. `DAY_OF_MONTH` is set to the closest possible
value, 30. The `YEAR` field maintains the value of 1999 because it
is a larger field than `MONTH`.
*Example* : Consider a `GregorianCalendar`
originally set to Sunday June 6, 1999. Calling
`roll(Calendar.WEEK_OF_MONTH, -1)` sets the calendar to
Tuesday June 1, 1999, whereas calling
`add(Calendar.WEEK_OF_MONTH, -1)` sets the calendar to
Sunday May 30, 1999. This is because the roll rule imposes an
additional constraint: The `MONTH` must not change when the
`WEEK_OF_MONTH` is rolled. Taken together with add rule 1,
the resultant date must be between Tuesday June 1 and Saturday June
5. According to add rule 2, the `DAY_OF_WEEK`, an invariant
when changing the `WEEK_OF_MONTH`, is set to Tuesday, the
closest possible value to Sunday (where Sunday is the first day of the
week).
| Parameters ||
|----------|----------------------------------------------------|
| `field` | `int`: the calendar field.
|
| `amount` | `int`: the signed amount to add to `field`.
|
| Throws ||
|--------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------|
| [IllegalArgumentException](https://developer.android.com/reference/java/lang/IllegalArgumentException) | if `field` is `ZONE_OFFSET`, `DST_OFFSET`, or unknown, or if any calendar fields have out-of-range values in non-lenient mode. |
**See also:**
- [roll(int, boolean)](https://developer.android.com/reference/java/util/GregorianCalendar#roll(int,%20boolean))
- [add(int, int)](https://developer.android.com/reference/java/util/GregorianCalendar#add(int,%20int))
- [Calendar.set(int, int)](https://developer.android.com/reference/java/util/Calendar#set(int,%20int))
### setGregorianChange
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setGregorianChange (Date date)
```
Sets the `GregorianCalendar` change date. This is the point when the switch
from Julian dates to Gregorian dates occurred. Default is October 15,
1582 (Gregorian). Previous to this, dates will be in the Julian calendar.
To obtain a pure Julian calendar, set the change date to
`Date(Long.MAX_VALUE)`. To obtain a pure Gregorian calendar,
set the change date to `Date(Long.MIN_VALUE)`.
| Parameters ||
|--------|--------------------------------------------------|
| `date` | `Date`: the given Gregorian cutover date.
|
### setTimeZone
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setTimeZone (TimeZone zone)
```
Sets the time zone with the given time zone value.
| Parameters ||
|--------|-----------------------------------------|
| `zone` | `TimeZone`: the given time zone.
|
### setWeekDate
Added in [API level 24](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void setWeekDate (int weekYear,
int weekOfYear,
int dayOfWeek)
```
Sets this `GregorianCalendar` to the date given by the
date specifiers - [`weekYear`](https://developer.android.com/reference/java/util/GregorianCalendar#week_year),
`weekOfYear`, and `dayOfWeek`. `weekOfYear`
follows the [`WEEK_OF_YEAR`
numbering](https://developer.android.com/reference/java/util/GregorianCalendar#week_and_year). The `dayOfWeek` value must be one of the
[DAY_OF_WEEK](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) values: [SUNDAY](https://developer.android.com/reference/java/util/Calendar#SUNDAY) to [SATURDAY](https://developer.android.com/reference/java/util/Calendar#SATURDAY).
Note that the numeric day-of-week representation differs from
the ISO 8601 standard, and that the `weekOfYear`
numbering is compatible with the standard when `getFirstDayOfWeek()` is `MONDAY` and `getMinimalDaysInFirstWeek()` is 4.
Unlike the `set` method, all of the calendar fields
and the instant of time value are calculated upon return.
If `weekOfYear` is out of the valid week-of-year
range in `weekYear`, the `weekYear`
and `weekOfYear` values are adjusted in lenient
mode, or an `IllegalArgumentException` is thrown in
non-lenient mode.
| 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](https://developer.android.com/reference/java/util/Calendar#DAY_OF_WEEK) field: [SUNDAY](https://developer.android.com/reference/java/util/Calendar#SUNDAY), ..., [SATURDAY](https://developer.android.com/reference/java/util/Calendar#SATURDAY).
|
| Throws ||
|--------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------|
| [IllegalArgumentException](https://developer.android.com/reference/java/lang/IllegalArgumentException) | if any of the given date specifiers is invalid, or if any of the calendar fields are inconsistent with the given date specifiers in non-lenient mode |
**See also:**
- [isWeekDateSupported()](https://developer.android.com/reference/java/util/GregorianCalendar#isWeekDateSupported())
- [Calendar.getFirstDayOfWeek()](https://developer.android.com/reference/java/util/Calendar#getFirstDayOfWeek())
- [Calendar.getMinimalDaysInFirstWeek()](https://developer.android.com/reference/java/util/Calendar#getMinimalDaysInFirstWeek())
### toZonedDateTime
Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public ZonedDateTime toZonedDateTime ()
```
Converts this object to a `ZonedDateTime` that represents
the same point on the time-line as this `GregorianCalendar`.
Since this object supports a Julian-Gregorian cutover date and
`ZonedDateTime` does not, it is possible that the resulting year,
month and day will have different values. The result will represent the
correct date in the ISO calendar system, which will also be the same value
for Modified Julian Days.
| Returns ||
|----------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------|
| [ZonedDateTime](https://developer.android.com/reference/java/time/ZonedDateTime) | a zoned date-time representing the same point on the time-line as this gregorian calendar
|
## Protected methods
### computeFields
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
protected void computeFields ()
```
Converts the time value (millisecond offset from the [Epoch](https://developer.android.com/reference/java/util/Calendar#Epoch)) to calendar field values.
The time is *not*
recomputed first; to recompute the time, then the fields, call the
`complete` method.
**See also:**
- [Calendar.complete()](https://developer.android.com/reference/java/util/Calendar#complete())
### computeTime
Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
protected void computeTime ()
```
Converts calendar field values to the time value (millisecond
offset from the [Epoch](https://developer.android.com/reference/java/util/Calendar#Epoch)).
| Throws ||
|--------------------------------------------------------------------------------------------------------|-------------------------------------|
| [IllegalArgumentException](https://developer.android.com/reference/java/lang/IllegalArgumentException) | if any calendar fields are invalid. |