public final class

GregorianChronology

extends AssembledChronology
java.lang.Object
   ↳ org.joda.time.Chronology
     ↳ org.joda.time.chrono.BaseChronology
       ↳ org.joda.time.chrono.AssembledChronology
         ↳ org.joda.time.chrono.GregorianChronology

Class Overview

Implements a pure proleptic Gregorian calendar system, which defines every fourth year as leap, unless the year is divisible by 100 and not by 400. This improves upon the Julian calendar leap year rule.

Although the Gregorian calendar did not exist before 1582 CE, this chronology assumes it did, thus it is proleptic. This implementation also fixes the start of the year at January 1, and defines the year zero.

GregorianChronology is thread-safe and immutable.

Summary

Public Methods
boolean equals(Object obj)
Checks if this chronology instance equals another.
long getDateTimeMillis(int year, int monthOfYear, int dayOfMonth, int millisOfDay)
Returns a datetime millisecond instant, formed from the given year, month, day, and millisecond values.
long getDateTimeMillis(int year, int monthOfYear, int dayOfMonth, int hourOfDay, int minuteOfHour, int secondOfMinute, int millisOfSecond)
Returns a datetime millisecond instant, formed from the given year, month, day, hour, minute, second, and millisecond values.
static GregorianChronology getInstance()
Gets an instance of the GregorianChronology in the default time zone.
static GregorianChronology getInstance(DateTimeZone zone, int minDaysInFirstWeek)
Gets an instance of the GregorianChronology in the given time zone.
static GregorianChronology getInstance(DateTimeZone zone)
Gets an instance of the GregorianChronology in the given time zone.
static GregorianChronology getInstanceUTC()
Gets an instance of the GregorianChronology.
int getMinimumDaysInFirstWeek()
DateTimeZone getZone()
Returns the DateTimeZone that this Chronology operates in, or null if unspecified.
int hashCode()
A suitable hash code for the chronology.
String toString()
Gets a debugging toString.
Chronology withUTC()
Gets the Chronology in the UTC time zone.
Chronology withZone(DateTimeZone zone)
Gets the Chronology in a specific time zone.
Protected Methods
void assemble(AssembledChronology.Fields fields)
Invoked by the constructor and after deserialization to allow subclasses to define all of its supported fields.
[Expand]
Inherited Methods
From class org.joda.time.chrono.AssembledChronology
From class org.joda.time.chrono.BaseChronology
From class org.joda.time.Chronology
From class java.lang.Object

Public Methods

public boolean equals (Object obj)

Checks if this chronology instance equals another.

Parameters
obj the object to compare to
Returns
  • true if equal

public long getDateTimeMillis (int year, int monthOfYear, int dayOfMonth, int millisOfDay)

Returns a datetime millisecond instant, formed from the given year, month, day, and millisecond values. The set of given values must refer to a valid datetime, or else an IllegalArgumentException is thrown.

The default implementation calls upon separate DateTimeFields to determine the result. Subclasses are encouraged to provide a more efficient implementation.

Parameters
year year to use
monthOfYear month to use
dayOfMonth day of month to use
millisOfDay millisecond to use
Returns
  • millisecond instant from 1970-01-01T00:00:00Z

public long getDateTimeMillis (int year, int monthOfYear, int dayOfMonth, int hourOfDay, int minuteOfHour, int secondOfMinute, int millisOfSecond)

Returns a datetime millisecond instant, formed from the given year, month, day, hour, minute, second, and millisecond values. The set of given values must refer to a valid datetime, or else an IllegalArgumentException is thrown.

The default implementation calls upon separate DateTimeFields to determine the result. Subclasses are encouraged to provide a more efficient implementation.

Parameters
year year to use
monthOfYear month to use
dayOfMonth day of month to use
hourOfDay hour to use
minuteOfHour minute to use
secondOfMinute second to use
millisOfSecond millisecond to use
Returns
  • millisecond instant from 1970-01-01T00:00:00Z

public static GregorianChronology getInstance ()

Gets an instance of the GregorianChronology in the default time zone.

Returns
  • a chronology in the default time zone

public static GregorianChronology getInstance (DateTimeZone zone, int minDaysInFirstWeek)

Gets an instance of the GregorianChronology in the given time zone.

Parameters
zone the time zone to get the chronology in, null is default
minDaysInFirstWeek minimum number of days in first week of the year; default is 4
Returns
  • a chronology in the specified time zone

public static GregorianChronology getInstance (DateTimeZone zone)

Gets an instance of the GregorianChronology in the given time zone.

Parameters
zone the time zone to get the chronology in, null is default
Returns
  • a chronology in the specified time zone

public static GregorianChronology getInstanceUTC ()

Gets an instance of the GregorianChronology. The time zone of the returned instance is UTC.

Returns
  • a singleton UTC instance of the chronology

public int getMinimumDaysInFirstWeek ()

public DateTimeZone getZone ()

Returns the DateTimeZone that this Chronology operates in, or null if unspecified.

Returns
  • DateTimeZone null if unspecified

public int hashCode ()

A suitable hash code for the chronology.

Returns
  • the hash code

public String toString ()

Gets a debugging toString.

Returns
  • a debugging string

public Chronology withUTC ()

Gets the Chronology in the UTC time zone.

Returns
  • the chronology in UTC

public Chronology withZone (DateTimeZone zone)

Gets the Chronology in a specific time zone.

Parameters
zone the zone to get the chronology in, null is default
Returns
  • the chronology

Protected Methods

protected void assemble (AssembledChronology.Fields fields)

Invoked by the constructor and after deserialization to allow subclasses to define all of its supported fields. All unset fields default to unsupported instances.

Parameters
fields container of fields