org.joda.time.chrono
Class GregorianChronology

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

All Implemented Interfaces:

Serializable

public final class GregorianChronology
extends AssembledChronology

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.

Since:

1.0

Author:

Guy Allard, Stephen Colebourne, Brian S O'Neill

See Also:

Wikipedia, JulianChronology, GJChronology, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.joda.time.chrono.AssembledChronology

AssembledChronology.Fields

Method Summary

protected void	assemble(AssembledChronology.Fields fields) Invoked by the constructor and after deserialization to allow subclasses to define all of its supported fields.
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) Gets an instance of the GregorianChronology in the given time zone.
static GregorianChronology	getInstance(DateTimeZone zone, int minDaysInFirstWeek) 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.

Methods inherited from class org.joda.time.chrono.AssembledChronology

centuries, centuryOfEra, clockhourOfDay, clockhourOfHalfday, dayOfMonth, dayOfWeek, dayOfYear, days, era, eras, getBase, getDateTimeMillis, getParam, halfdayOfDay, halfdays, hourOfDay, hourOfHalfday, hours, millis, millisOfDay, millisOfSecond, minuteOfDay, minuteOfHour, minutes, monthOfYear, months, secondOfDay, secondOfMinute, seconds, weekOfWeekyear, weeks, weekyear, weekyearOfCentury, weekyears, year, yearOfCentury, yearOfEra, years

Methods inherited from class org.joda.time.chrono.BaseChronology

add, add, get, get, get, set, validate

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

getInstanceUTC

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

getInstance

public static GregorianChronology getInstance()

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

Returns:

a chronology in the default time zone

getInstance

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

getInstance

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

withUTC

public Chronology withUTC()

Gets the Chronology in the UTC time zone.

Specified by:

withUTC in class BaseChronology

Returns:

the chronology in UTC

withZone

public Chronology withZone(DateTimeZone zone)

Gets the Chronology in a specific time zone.

Specified by:

withZone in class BaseChronology

Parameters:

zone - the zone to get the chronology in, null is default

Returns:

the chronology

See Also:

ZonedChronology

assemble

protected void assemble(AssembledChronology.Fields fields)

Description copied from class: AssembledChronology

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

getZone

public DateTimeZone getZone()

Description copied from class: BaseChronology

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

Overrides:

getZone in class AssembledChronology

Returns:

DateTimeZone null if unspecified

getDateTimeMillis

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

Description copied from class: BaseChronology

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.

Overrides:

getDateTimeMillis in class AssembledChronology

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

Throws:

IllegalArgumentException - if the values are invalid

getDateTimeMillis

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

Description copied from class: BaseChronology

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.

Overrides:

getDateTimeMillis in class AssembledChronology

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

Throws:

IllegalArgumentException - if the values are invalid

getMinimumDaysInFirstWeek

public int getMinimumDaysInFirstWeek()

equals

public boolean equals(Object obj)

Checks if this chronology instance equals another.

Overrides:

equals in class Object

Parameters:

obj - the object to compare to

Returns:

true if equal

Since:

1.6

hashCode

public int hashCode()

A suitable hash code for the chronology.

Overrides:

hashCode in class Object

Returns:

the hash code

Since:

1.6

toString

public String toString()

Gets a debugging toString.

Specified by:

toString in class BaseChronology

Returns:

a debugging string