GregorianCalendar (ICU4J 50)

java.lang.Object
- com.ibm.icu.util.Calendar
- - com.ibm.icu.util.GregorianCalendar

All Implemented Interfaces:

Serializable, Cloneable, Comparable<Calendar>

Direct Known Subclasses:

BuddhistCalendar, JapaneseCalendar, TaiwanCalendar
```
public class GregorianCalendar
extends Calendar
```
[icu enhancement] ICU's replacement for java.util.GregorianCalendar. Methods, fields, and other functionality specific to ICU are labeled '[icu]'.

GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar used by most of the world.
The standard (Gregorian) calendar has 2 eras, BC and AD.
This implementation handles a single discontinuity, which corresponds by default to the date the Gregorian calendar was instituted (October 15, 1582 in some countries, later in others). The cutover date may be changed by the caller by calling setGregorianChange().
Historically, in those countries which adopted the Gregorian calendar first, October 4, 1582 was thus followed by October 15, 1582. 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.
Values calculated for the WEEK_OF_YEAR field range from 1 to 53. Week 1 for a year is the earliest seven day period starting on getFirstDayOfWeek() that contains at least getMinimalDaysInFirstWeek() days from that year. It thus depends on the values of getMinimalDaysInFirstWeek(), getFirstDayOfWeek(), and the day of the week of January 1. Weeks between week 1 of one year and week 1 of the following year are numbered sequentially from 2 to 52 or 53 (as needed).
For example, January 1, 1998 was a Thursday. If getFirstDayOfWeek() is MONDAY and getMinimalDaysInFirstWeek() is 4 (these are the values reflecting ISO 8601 and many national standards), then week 1 of 1998 starts on December 29, 1997, and ends on January 4, 1998. 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.
Values calculated for the WEEK_OF_MONTH field range from 0 or 1 to 4 or 5. 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.
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 savings time
 pdt.setStartRule(Calendar.MARCH, 2, Calendar.SUNDAY, 2 * 60 * 60 * 1000);
 pdt.setEndRule(Calendar.NOVEMBER, 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
```
GregorianCalendar usually should be instantiated using Calendar.getInstance(ULocale) passing in a ULocale with the tag "@calendar=gregorian".
Author:

David Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu

See Also:
Calendar, TimeZone, Serialized Form
Status:
Stable ICU 2.0.

Nested Class Summary
- Nested classes/interfaces inherited from class com.ibm.icu.util.Calendar
  Calendar.FormatConfiguration

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`AD` Value of the `ERA` field indicating the common era (Anno Domini), also known as CE.
`static int`	`BC` Value of the `ERA` field indicating the period before the common era (before Christ), also known as BCE.
`protected boolean`	`invertGregorian` Used by handleComputeJulianDay() and handleComputeMonthStart().
`protected boolean`	`isGregorian` Used by handleComputeJulianDay() and handleComputeMonthStart().

Fields inherited from class com.ibm.icu.util.Calendar
AM, AM_PM, APRIL, AUGUST, BASE_FIELD_COUNT, DATE, DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_WEEK_IN_MONTH, DAY_OF_YEAR, DECEMBER, DOW_LOCAL, DST_OFFSET, EPOCH_JULIAN_DAY, ERA, EXTENDED_YEAR, FEBRUARY, FRIDAY, GREATEST_MINIMUM, HOUR, HOUR_OF_DAY, INTERNALLY_SET, IS_LEAP_MONTH, JAN_1_1_JULIAN_DAY, JANUARY, JULIAN_DAY, JULY, JUNE, LEAST_MAXIMUM, MARCH, MAX_DATE, MAX_FIELD_COUNT, MAX_JULIAN, MAX_MILLIS, MAXIMUM, MAY, MILLISECOND, MILLISECONDS_IN_DAY, MIN_DATE, MIN_JULIAN, MIN_MILLIS, MINIMUM, MINIMUM_USER_STAMP, MINUTE, MONDAY, MONTH, NOVEMBER, OCTOBER, ONE_DAY, ONE_HOUR, ONE_MINUTE, ONE_SECOND, ONE_WEEK, PM, RESOLVE_REMAP, SATURDAY, SECOND, SEPTEMBER, SUNDAY, THURSDAY, TUESDAY, UNDECIMBER, UNSET, WALLTIME_FIRST, WALLTIME_LAST, WALLTIME_NEXT_VALID, WEDNESDAY, WEEK_OF_MONTH, WEEK_OF_YEAR, WEEKDAY, WEEKEND, WEEKEND_CEASE, WEEKEND_ONSET, YEAR, YEAR_WOY, ZONE_OFFSET

Constructor Summary

Constructors
Constructor and Description
`GregorianCalendar()` Constructs a default GregorianCalendar using the current time in the default time zone with the default `FORMAT` locale.
`GregorianCalendar(int year, int month, int date)` Constructs a GregorianCalendar with the given date set in the default time zone with the default `FORMAT` locale.
`GregorianCalendar(int year, int month, int date, int hour, int minute)` Constructs a GregorianCalendar with the given date and time set for the default time zone with the default `FORMAT` locale.
`GregorianCalendar(int year, int month, int date, int hour, int minute, int second)` Constructs a GregorianCalendar with the given date and time set for the default time zone with the default `FORMAT` locale.
`GregorianCalendar(Locale aLocale)` Constructs a GregorianCalendar based on the current time in the default time zone with the given locale.
`GregorianCalendar(TimeZone zone)` Constructs a GregorianCalendar based on the current time in the given time zone with the default `FORMAT` locale.
`GregorianCalendar(TimeZone zone, Locale aLocale)` [icu] Constructs a GregorianCalendar based on the current time in the given time zone with the given locale.
`GregorianCalendar(TimeZone zone, ULocale locale)` Constructs a GregorianCalendar based on the current time in the given time zone with the given locale.
`GregorianCalendar(ULocale locale)` [icu] Constructs a GregorianCalendar based on the current time in the default time zone with the given locale.

Method Summary

Methods
Modifier and Type	Method and Description
`int`	`getActualMaximum(int field)` Return the maximum value that this field could have, given the current date.
`int`	`getActualMinimum(int field)` Return the minimum value that this field could have, given the current date.
`Date`	`getGregorianChange()` Gets the Gregorian Calendar change date.
`String`	`getType()` [icu] Returns the calendar type name string for this Calendar object.
`protected void`	`handleComputeFields(int julianDay)` Override Calendar to compute several fields specific to the hybrid Gregorian-Julian calendar system.
`protected int`	`handleComputeJulianDay(int bestField)` Subclasses may override this.
`protected int`	`handleComputeMonthStart(int eyear, int month, boolean useMonth)` Return JD of start of given month/year
`protected int`	`handleGetExtendedYear()` Returns the extended year defined by the current fields.
`protected int`	`handleGetLimit(int field, int limitType)` Subclass API for defining limits of different types.
`protected int`	`handleGetMonthLength(int extendedYear, int month)` Returns the number of days in the given month of the given extended year of this calendar system.
`protected int`	`handleGetYearLength(int eyear)` Returns the number of days in the given extended year of this calendar system.
`int`	`hashCode()` Override hashCode.
`boolean`	`isEquivalentTo(Calendar other)` Returns true if the given Calendar object is equivalent to this one.
`boolean`	`isLeapYear(int year)` Determines if the given year is a leap year.
`void`	`roll(int field, int amount)` Roll a field by a signed amount.
`void`	`setGregorianChange(Date date)` Sets the GregorianCalendar change date.

Methods inherited from class com.ibm.icu.util.Calendar
add, after, before, clear, clear, clone, compareTo, complete, computeFields, computeGregorianFields, computeGregorianMonthStart, computeJulianDay, computeMillisInDay, computeTime, computeZoneOffset, equals, fieldDifference, fieldName, floorDivide, floorDivide, floorDivide, floorDivide, get, getAvailableLocales, getAvailableULocales, getDateTimeFormat, getDateTimeFormat, getDateTimePattern, getDayOfWeekType, getDefaultDayInMonth, getDefaultMonthInYear, getDisplayName, getDisplayName, getFieldCount, getFieldResolutionTable, getFirstDayOfWeek, getGreatestMinimum, getGregorianDayOfMonth, getGregorianDayOfYear, getGregorianMonth, getGregorianYear, getInstance, getInstance, getInstance, getInstance, getInstance, getInstance, getKeywordValuesForLocale, getLeastMaximum, getLimit, getLocale, getMaximum, getMinimalDaysInFirstWeek, getMinimum, getRepeatedWallTimeOption, getSkippedWallTimeOption, getStamp, getTime, getTimeInMillis, getTimeZone, getWeekendTransition, gregorianMonthLength, gregorianPreviousMonthLength, handleCreateFields, handleGetDateFormat, handleGetDateFormat, handleGetDateFormat, handleGetDateFormat, internalGet, internalGet, internalGetTimeInMillis, internalSet, isGregorianLeapYear, isLenient, isSet, isWeekend, isWeekend, julianDayToDayOfWeek, julianDayToMillis, millisToJulianDay, newerField, newestStamp, pinField, prepareGetActual, resolveFields, roll, set, set, set, set, setFirstDayOfWeek, setLenient, setMinimalDaysInFirstWeek, setRepeatedWallTimeOption, setSkippedWallTimeOption, setTime, setTimeInMillis, setTimeZone, toString, validateField, validateField, validateFields, weekNumber, weekNumber

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - BC
```
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, Constant Field Values
    Status:
    Stable ICU 2.0.
  - AD
```
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, Constant Field Values
    Status:
    Stable ICU 2.0.
  - isGregorian
```
protected transient boolean isGregorian
```
    Used by handleComputeJulianDay() and handleComputeMonthStart().
    
    Status:
    Stable ICU 2.0.
  - invertGregorian
```
protected transient boolean invertGregorian
```
    Used by handleComputeJulianDay() and handleComputeMonthStart().
    
    Status:
    Stable ICU 2.0.
- Constructor Detail
  - GregorianCalendar
```
public GregorianCalendar()
```
    Constructs a default GregorianCalendar using the current time in the default time zone with the default FORMAT locale.
    
    See Also:
    ULocale.Category.FORMAT
    Status:
    Stable ICU 2.0.
  - GregorianCalendar
```
public GregorianCalendar(TimeZone zone)
```
    Constructs a GregorianCalendar based on the current time in the given time zone with the default FORMAT locale.
    
    Parameters:
    zone - the given time zone.
    See Also:
    ULocale.Category.FORMAT
    Status:
    Stable ICU 2.0.
  - GregorianCalendar
```
public GregorianCalendar(Locale aLocale)
```
    Constructs a GregorianCalendar based on the current time in the default time zone with the given locale.
    
    Parameters:
    aLocale - the given locale.
    Status:
    Stable ICU 2.0.
  - GregorianCalendar
```
public GregorianCalendar(ULocale locale)
```
    [icu] Constructs a GregorianCalendar based on the current time in the default time zone with the given locale.
    
    Parameters:
    locale - the given ulocale.
    Status:
    Stable ICU 3.2.
  - GregorianCalendar
```
public GregorianCalendar(TimeZone zone,
                 Locale aLocale)
```
    [icu] Constructs a GregorianCalendar based on the current time in the given time zone with the given locale.
    
    Parameters:
    zone - the given time zone.
    aLocale - the given locale.
    Status:
    Stable ICU 2.0.
  - GregorianCalendar
```
public GregorianCalendar(TimeZone zone,
                 ULocale locale)
```
    Constructs a GregorianCalendar based on the current time in the given time zone with the given locale.
    
    Parameters:
    zone - the given time zone.
    locale - the given ulocale.
    Status:
    Stable ICU 3.2.
  - GregorianCalendar
```
public GregorianCalendar(int year,
                 int month,
                 int date)
```
    Constructs a GregorianCalendar with the given date set in the default time zone with the default FORMAT locale.
    
    Parameters:
    year - the value used to set the YEAR time field in the calendar.
    month - the value used to set the MONTH time field in the calendar. Month value is 0-based. e.g., 0 for January.
    date - the value used to set the DATE time field in the calendar.
    See Also:
    ULocale.Category.FORMAT
    Status:
    Stable ICU 2.0.
  - GregorianCalendar
```
public GregorianCalendar(int year,
                 int month,
                 int date,
                 int hour,
                 int minute)
```
    Constructs a GregorianCalendar with the given date and time set for the default time zone with the default FORMAT locale.
    
    Parameters:
    year - the value used to set the YEAR time field in the calendar.
    month - the value used to set the MONTH time field in the calendar. Month value is 0-based. e.g., 0 for January.
    date - the value used to set the DATE time field in the calendar.
    hour - the value used to set the HOUR_OF_DAY time field in the calendar.
    minute - the value used to set the MINUTE time field in the calendar.
    See Also:
    ULocale.Category.FORMAT
    Status:
    Stable ICU 2.0.
  - GregorianCalendar
```
public GregorianCalendar(int year,
                 int month,
                 int date,
                 int hour,
                 int minute,
                 int second)
```
    Constructs a GregorianCalendar with the given date and time set for the default time zone with the default FORMAT locale.
    
    Parameters:
    year - the value used to set the YEAR time field in the calendar.
    month - the value used to set the MONTH time field in the calendar. Month value is 0-based. e.g., 0 for January.
    date - the value used to set the DATE time field in the calendar.
    hour - the value used to set the HOUR_OF_DAY time field in the calendar.
    minute - the value used to set the MINUTE time field in the calendar.
    second - the value used to set the SECOND time field in the calendar.
    See Also:
    ULocale.Category.FORMAT
    Status:
    Stable ICU 2.0.
- Method Detail
  - handleGetLimit
```
protected int handleGetLimit(int field,
                 int limitType)
```
    Description copied from class: Calendar
    Subclass API for defining limits of different types. Subclasses must implement this method to return limits for the following fields:
```
ERA
 YEAR
 MONTH
 WEEK_OF_YEAR
 WEEK_OF_MONTH
 DAY_OF_MONTH
 DAY_OF_YEAR
 DAY_OF_WEEK_IN_MONTH
 YEAR_WOY
 EXTENDED_YEAR
```
    Specified by:
    
    handleGetLimit in class Calendar
    
    Parameters:
    field - one of the above field numbers
    limitType - one of MINIMUM, GREATEST_MINIMUM, LEAST_MAXIMUM, or MAXIMUM
    Status:
    Stable ICU 2.0.
  - setGregorianChange
```
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. 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 - the given Gregorian cutover date.
    Status:
    Stable ICU 2.0.
  - getGregorianChange
```
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. Previous to this, dates will be in the Julian calendar.
    
    Returns:
    the Gregorian cutover date for this calendar.
    Status:
    Stable ICU 2.0.
  - isLeapYear
```
public boolean isLeapYear(int year)
```
    Determines if the given year is a leap year. Returns true if the given year is a leap year.
    
    Parameters:
    year - the given year.
    
    Returns:
    true if the given year is a leap year; false otherwise.
    Status:
    Stable ICU 2.0.
  - isEquivalentTo
```
public boolean isEquivalentTo(Calendar other)
```
    Returns true if the given Calendar object is equivalent to this one. Calendar override.
    
    Overrides:
    
    isEquivalentTo in class Calendar
    
    Parameters:
    other - the Calendar to be compared with this Calendar
    Status:
    Stable ICU 2.4.
  - hashCode
```
public int hashCode()
```
    Override hashCode. Generates the hash code for the GregorianCalendar object
    
    Overrides:
    
    hashCode in class Calendar
    
    Returns:
    a hash code value for this object.
    Status:
    Stable ICU 2.0.
  - roll
```
public void roll(int field,
        int amount)
```
    Roll a field by a signed amount.
    
    Overrides:
    
    roll in class Calendar
    
    Parameters:
    field - the calendar field to roll.
    amount - the amount by which the field should be rolled.
    See Also:
    Calendar.roll(int, boolean), Calendar.add(int, int)
    Status:
    Stable ICU 2.0.
  - getActualMinimum
```
public int getActualMinimum(int field)
```
    Return the minimum value that this field could have, given the current date. For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
    
    Overrides:
    
    getActualMinimum in class Calendar
    
    Parameters:
    field - the field whose actual minimum value is desired.
    
    Returns:
    the minimum of the given field for the current date of this calendar
    See Also:
    Calendar.getMinimum(int), Calendar.getGreatestMinimum(int)
    Status:
    Stable ICU 2.0.
  - getActualMaximum
```
public int getActualMaximum(int field)
```
    Return the maximum value that this field could have, given the current date. For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar, for some years the actual maximum for MONTH is 12, and for others 13.
    
    Overrides:
    
    getActualMaximum in class Calendar
    
    Parameters:
    field - the field whose maximum is desired
    
    Returns:
    the maximum of the given field for the current date of this calendar
    See Also:
    Calendar.getMaximum(int), Calendar.getLeastMaximum(int)
    Status:
    Stable ICU 2.0.
  - handleGetMonthLength
```
protected int handleGetMonthLength(int extendedYear,
                       int month)
```
    Description copied from class: Calendar
    
    Returns the number of days in the given month of the given extended year of this calendar system. Subclasses should override this method if they can provide a more correct or more efficient implementation than the default implementation in Calendar.
    
    Overrides:
    
    handleGetMonthLength in class Calendar
    
    Status:
    Stable ICU 2.0.
  - handleGetYearLength
```
protected int handleGetYearLength(int eyear)
```
    Description copied from class: Calendar
    
    Returns the number of days in the given extended year of this calendar system. Subclasses should override this method if they can provide a more correct or more efficient implementation than the default implementation in Calendar.
    
    Overrides:
    
    handleGetYearLength in class Calendar
    
    Status:
    Stable ICU 2.0.
  - handleComputeFields
```
protected void handleComputeFields(int julianDay)
```
    Override Calendar to compute several fields specific to the hybrid Gregorian-Julian calendar system. These are:
    - ERA
    - YEAR
    - MONTH
    - DAY_OF_MONTH
    - DAY_OF_YEAR
    - EXTENDED_YEAR
    Overrides:
    
    handleComputeFields in class Calendar
    
    Status:
    Stable ICU 2.0.
  - handleGetExtendedYear
```
protected int handleGetExtendedYear()
```
    Description copied from class: Calendar
    
    Returns the extended year defined by the current fields. This will use the EXTENDED_YEAR field or the YEAR and supra-year fields (such as ERA) specific to the calendar system, depending on which set of fields is newer.
    
    Specified by:
    
    handleGetExtendedYear in class Calendar
    
    Returns:
    the extended year
    Status:
    Stable ICU 2.0.
  - handleComputeJulianDay
```
protected int handleComputeJulianDay(int bestField)
```
    Description copied from class: Calendar
    
    Subclasses may override this. This method calls handleGetMonthLength() to obtain the calendar-specific month length.
    
    Overrides:
    
    handleComputeJulianDay in class Calendar
    
    Status:
    Stable ICU 2.0.
  - handleComputeMonthStart
```
protected int handleComputeMonthStart(int eyear,
                          int month,
                          boolean useMonth)
```
    Return JD of start of given month/year
    
    Specified by:
    
    handleComputeMonthStart in class Calendar
    
    Parameters:
    eyear - the extended year
    month - the zero-based month, or 0 if useMonth is false
    useMonth - if false, compute the day before the first day of the given year, otherwise, compute the day before the first day of the given month
    
    Returns:
    the Julian day number of the day before the first day of the given month and year
    Status:
    Stable ICU 2.0.
  - getType
```
public String getType()
```
    [icu] Returns the calendar type name string for this Calendar object. The returned string is the legacy ICU calendar attribute value, for example, "gregorian" or "japanese".
    See type="old type name" for the calendar attribute of locale IDs at http://www.unicode.org/reports/tr35/#Key_Type_Definitions
    
    Overrides:
    
    getType in class Calendar
    
    Returns:
    legacy calendar type name string
    Status:
    Stable ICU 3.8.

Class GregorianCalendar

Nested Class Summary

Nested classes/interfaces inherited from class com.ibm.icu.util.Calendar

Field Summary

Fields inherited from class com.ibm.icu.util.Calendar

Constructor Summary

Method Summary

Methods inherited from class com.ibm.icu.util.Calendar

Methods inherited from class java.lang.Object

Field Detail

BC

AD

isGregorian

invertGregorian

Constructor Detail

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

GregorianCalendar

Method Detail

handleGetLimit

setGregorianChange

getGregorianChange

isLeapYear

isEquivalentTo

hashCode

roll

getActualMinimum

getActualMaximum

handleGetMonthLength

handleGetYearLength

handleComputeFields

handleGetExtendedYear

handleComputeJulianDay

handleComputeMonthStart

getType