java.lang.Object
- org.joda.time.Chronology
- - org.joda.time.chrono.BaseChronology
  - - org.joda.time.chrono.AssembledChronology
    - - org.joda.time.chrono.GJChronology

All Implemented Interfaces:

java.io.Serializable
```
public final class GJChronology
extends AssembledChronology
```
Implements the Gregorian/Julian calendar system which is the calendar system used in most of the world. Wherever possible, it is recommended to use the ISOChronology instead.
The Gregorian calendar replaced the Julian calendar, and the point in time when this chronology switches can be controlled using the second parameter of the getInstance method. By default this cutover is set to the date the Gregorian calendar was first instituted, October 15, 1582.
Before this date, this chronology uses the proleptic Julian calendar (proleptic means extending indefinitely). The Julian calendar has leap years every four years, whereas the Gregorian has special rules for 100 and 400 years. A meaningful result will thus be obtained for all input values. However before 8 CE, Julian leap years were irregular, and before 45 BCE there was no Julian calendar.
This chronology differs from GregorianCalendar in that years in BCE are returned correctly. Thus year 1 BCE is returned as -1 instead of 1. The yearOfEra field produces results compatible with GregorianCalendar.
The Julian calendar does not have a year zero, and so year -1 is followed by year 1. If the Gregorian cutover date is specified at or before year -1 (Julian), year zero is defined. In other words, the proleptic Gregorian chronology used by this class has a year zero.
To create a pure proleptic Julian chronology, use JulianChronology, and to create a pure proleptic Gregorian chronology, use GregorianChronology.
GJChronology is thread-safe and immutable.

Since:

1.0

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`private class`	`GJChronology.CutoverField`	This basic cutover field adjusts calls to 'get' and 'set' methods, and assumes that calls to add and addWrapField are unaffected by the cutover.
`private class`	`GJChronology.ImpreciseCutoverField`	Cutover field for variable length fields.
`private static class`	`GJChronology.LinkedDurationField`	Links the duration back to a ImpreciseCutoverField.

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

Field Summary

Fields
Modifier and Type	Field	Description
`private static java.util.concurrent.ConcurrentHashMap<GJCacheKey,GJChronology>`	`cCache`	Cache of zone to chronology list
`(package private) static Instant`	`DEFAULT_CUTOVER`	The default GregorianJulian cutover point.
`private Instant`	`iCutoverInstant`
`private long`	`iCutoverMillis`
`private long`	`iGapDuration`
`private GregorianChronology`	`iGregorianChronology`
`private JulianChronology`	`iJulianChronology`
`private static long`	`serialVersionUID`	Serialization lock

Constructor Summary

Constructors
Modifier	Constructor	Description
`private`	`GJChronology(JulianChronology julian, GregorianChronology gregorian, Instant cutoverInstant)`
`private`	`GJChronology(Chronology base, JulianChronology julian, GregorianChronology gregorian, Instant cutoverInstant)`	Called when applying a time zone.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`assemble(AssembledChronology.Fields fields)`	Invoked by the constructor and after deserialization to allow subclasses to define all of its supported fields.
`private static long`	`convertByWeekyear(long instant, Chronology from, Chronology to)`	Convert a datetime from one chronology to another.
`private static long`	`convertByYear(long instant, Chronology from, Chronology to)`	Convert a datetime from one chronology to another.
`boolean`	`equals(java.lang.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.
`Instant`	`getGregorianCutover()`	Gets the cutover instant between Gregorian and Julian chronologies.
`static GJChronology`	`getInstance()`	Factory method returns instances of the default GJ cutover chronology.
`static GJChronology`	`getInstance(DateTimeZone zone)`	Factory method returns instances of the GJ cutover chronology.
`static GJChronology`	`getInstance(DateTimeZone zone, long gregorianCutover, int minDaysInFirstWeek)`	Factory method returns instances of the GJ cutover chronology.
`static GJChronology`	`getInstance(DateTimeZone zone, ReadableInstant gregorianCutover)`	Factory method returns instances of the GJ cutover chronology.
`static GJChronology`	`getInstance(DateTimeZone zone, ReadableInstant gregorianCutover, int minDaysInFirstWeek)`	Factory method returns instances of the GJ cutover chronology.
`static GJChronology`	`getInstanceUTC()`	Factory method returns instances of the default GJ cutover chronology.
`int`	`getMinimumDaysInFirstWeek()`	Gets the minimum days needed for a week to be the first week in a year.
`DateTimeZone`	`getZone()`	Returns the DateTimeZone that this Chronology operates in, or null if unspecified.
`(package private) long`	`gregorianToJulianByWeekyear(long instant)`
`(package private) long`	`gregorianToJulianByYear(long instant)`
`int`	`hashCode()`	A suitable hash code for the chronology.
`(package private) long`	`julianToGregorianByWeekyear(long instant)`
`(package private) long`	`julianToGregorianByYear(long instant)`
`private java.lang.Object`	`readResolve()`	Serialization singleton
`java.lang.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

- Field Detail
  - serialVersionUID
```
private static final long serialVersionUID
```
    Serialization lock
    
    See Also:
    
    Constant Field Values
  - DEFAULT_CUTOVER
```
static final Instant DEFAULT_CUTOVER
```
    The default GregorianJulian cutover point.
  - cCache
```
private static final java.util.concurrent.ConcurrentHashMap<GJCacheKey,GJChronology> cCache
```
    Cache of zone to chronology list
  - iJulianChronology
```
private JulianChronology iJulianChronology
```
  - iGregorianChronology
```
private GregorianChronology iGregorianChronology
```
  - iCutoverInstant
```
private Instant iCutoverInstant
```
  - iCutoverMillis
```
private long iCutoverMillis
```
  - iGapDuration
```
private long iGapDuration
```
- Constructor Detail
  - GJChronology
```
private GJChronology(JulianChronology julian,
                     GregorianChronology gregorian,
                     Instant cutoverInstant)
```
    Parameters:
    
    julian - chronology used before the cutover instant
    
    gregorian - chronology used at and after the cutover instant
    
    cutoverInstant - instant when the gregorian chronology began
  - GJChronology
```
private GJChronology(Chronology base,
                     JulianChronology julian,
                     GregorianChronology gregorian,
                     Instant cutoverInstant)
```
    Called when applying a time zone.
- Method Detail
  - convertByYear
```
private static long convertByYear(long instant,
                                  Chronology from,
                                  Chronology to)
```
    Convert a datetime from one chronology to another.
  - convertByWeekyear
```
private static long convertByWeekyear(long instant,
                                      Chronology from,
                                      Chronology to)
```
    Convert a datetime from one chronology to another.
  - getInstanceUTC
```
public static GJChronology getInstanceUTC()
```
    Factory method returns instances of the default GJ cutover chronology. This uses a cutover date of October 15, 1582 (Gregorian) 00:00:00 UTC. For this value, October 4, 1582 (Julian) is followed by October 15, 1582 (Gregorian).
    The first day of the week is designated to be Monday, and the minimum days in the first week of the year is 4.
    The time zone of the returned instance is UTC.
  - getInstance
```
public static GJChronology getInstance()
```
    Factory method returns instances of the default GJ cutover chronology. This uses a cutover date of October 15, 1582 (Gregorian) 00:00:00 UTC. For this value, October 4, 1582 (Julian) is followed by October 15, 1582 (Gregorian).
    The first day of the week is designated to be Monday, and the minimum days in the first week of the year is 4.
    The returned chronology is in the default time zone.
  - getInstance
```
public static GJChronology getInstance(DateTimeZone zone)
```
    Factory method returns instances of the GJ cutover chronology. This uses a cutover date of October 15, 1582 (Gregorian) 00:00:00 UTC. For this value, October 4, 1582 (Julian) is followed by October 15, 1582 (Gregorian).
    The first day of the week is designated to be Monday, and the minimum days in the first week of the year is 4.
    
    Parameters:
    
    zone - the time zone to use, null is default
  - getInstance
```
public static GJChronology getInstance(DateTimeZone zone,
                                       ReadableInstant gregorianCutover)
```
    Factory method returns instances of the GJ cutover chronology. Any cutover date may be specified.
    The first day of the week is designated to be Monday, and the minimum days in the first week of the year is 4.
    
    Parameters:
    
    zone - the time zone to use, null is default
    
    gregorianCutover - the cutover to use, null means default
  - getInstance
```
public static GJChronology getInstance(DateTimeZone zone,
                                       ReadableInstant gregorianCutover,
                                       int minDaysInFirstWeek)
```
    Factory method returns instances of the GJ cutover chronology. Any cutover date may be specified.
    
    Parameters:
    
    zone - the time zone to use, null is default
    
    gregorianCutover - the cutover to use, null means default
    
    minDaysInFirstWeek - minimum number of days in first week of the year; default is 4
  - getInstance
```
public static GJChronology getInstance(DateTimeZone zone,
                                       long gregorianCutover,
                                       int minDaysInFirstWeek)
```
    Factory method returns instances of the GJ cutover chronology. Any cutover date may be specified.
    
    Parameters:
    
    zone - the time zone to use, null is default
    
    gregorianCutover - the cutover to use
    
    minDaysInFirstWeek - minimum number of days in first week of the year; default is 4
  - readResolve
```
private java.lang.Object readResolve()
```
    Serialization singleton
  - 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
  - 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
  - getDateTimeMillis
```
public long getDateTimeMillis(int year,
                              int monthOfYear,
                              int dayOfMonth,
                              int millisOfDay)
                       throws java.lang.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:
    
    java.lang.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 java.lang.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:
    
    java.lang.IllegalArgumentException - if the values are invalid
  - getGregorianCutover
```
public Instant getGregorianCutover()
```
    Gets the cutover instant between Gregorian and Julian chronologies.
    
    Returns:
    
    the cutover instant
  - getMinimumDaysInFirstWeek
```
public int getMinimumDaysInFirstWeek()
```
    Gets the minimum days needed for a week to be the first week in a year.
    
    Returns:
    
    the minimum days
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Checks if this chronology instance equals another.
    
    Overrides:
    
    equals in class java.lang.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 java.lang.Object
    
    Returns:
    
    the hash code
    
    Since:
    
    1.6
  - toString
```
public java.lang.String toString()
```
    Gets a debugging toString.
    
    Specified by:
    
    toString in class BaseChronology
    
    Returns:
    
    a debugging string
  - 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.
    
    Specified by:
    
    assemble in class AssembledChronology
    
    Parameters:
    
    fields - container of fields
  - julianToGregorianByYear
```
long julianToGregorianByYear(long instant)
```
  - gregorianToJulianByYear
```
long gregorianToJulianByYear(long instant)
```
  - julianToGregorianByWeekyear
```
long julianToGregorianByWeekyear(long instant)
```
  - gregorianToJulianByWeekyear
```
long gregorianToJulianByWeekyear(long instant)
```

Class GJChronology

Nested Class Summary

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

Field Summary

Constructor Summary

Method Summary

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

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

Methods inherited from class java.lang.Object

Field Detail

serialVersionUID

DEFAULT_CUTOVER

cCache

iJulianChronology

iGregorianChronology

iCutoverInstant

iCutoverMillis

iGapDuration

Constructor Detail

GJChronology

GJChronology

Method Detail

convertByYear

convertByWeekyear

getInstanceUTC

getInstance

getInstance

getInstance

getInstance

getInstance

readResolve

getZone

withUTC

withZone

getDateTimeMillis

getDateTimeMillis

getGregorianCutover

getMinimumDaysInFirstWeek

equals

hashCode

toString

assemble

julianToGregorianByYear

gregorianToJulianByYear

julianToGregorianByWeekyear

gregorianToJulianByWeekyear