org.joda.time

Class Chronology

java.lang.Object

org.joda.time.Chronology

Direct Known Subclasses:

BaseChronology

public abstract class Chronology
extends java.lang.Object

Chronology provides access to the individual date time fields for a chronological calendar system.

Various chronologies are supported by subclasses including ISO and GregorianJulian. To construct a Chronology you should use the factory methods on the chronology subclass in the chrono package.

For example, to obtain the current time in the coptic calendar system:

 DateTime dt = new DateTime(CopticChronology.getInstance());
 

The provided chronology implementations are:

• ISO - The de facto world calendar system, based on the ISO-8601 standard
• GJ - Historically accurate calendar with Julian followed by Gregorian
• Gregorian - The Gregorian calendar system used for all time (proleptic)
• Julian - The Julian calendar system used for all time (proleptic)
• Buddhist - The Buddhist calendar system which is an offset in years from GJ
• Coptic - The Coptic calendar system which defines 30 day months
• Ethiopic - The Ethiopic calendar system which defines 30 day months
• Islamic - The Islamic, or Hijri, lunar calendar system

Hopefully future releases will contain more chronologies.

This class defines a number of fields with names from the ISO8601 standard. It does not 'strongly' define these fields however, thus implementations are free to interpret the field names as they wish. For example, a week could be defined as 10 days and a month as 40 days in a special WeirdChronology implementation. Clearly the GJ and ISO implementations provided use the field names as you would expect.

Since:

1.0

See Also:

ISOChronology, GJChronology, GregorianChronology, JulianChronology, CopticChronology, BuddhistChronology, EthiopicChronology, IslamicChronology

Constructor Summary

Constructors

Constructor and Description
Chronology()

Method Summary

Modifier and Type	Method and Description
abstract long	add(long instant, long duration, int scalar) Adds the duration to the instant, specifying the number of times to add.
abstract long	add(ReadablePeriod period, long instant, int scalar) Adds the period to the instant, specifying the number of times to add.
abstract DurationField	centuries() Get the centuries duration field for this chronology.
abstract DateTimeField	centuryOfEra() Get the century of era field for this chronology.
abstract DateTimeField	clockhourOfDay() Get the hour of day (offset to 1-24) field for this chronology.
abstract DateTimeField	clockhourOfHalfday() Get the hour of am/pm (offset to 1-12) field for this chronology.
abstract DateTimeField	dayOfMonth() Get the day of month field for this chronology.
abstract DateTimeField	dayOfWeek() Get the day of week field for this chronology.
abstract DateTimeField	dayOfYear() Get the day of year field for this chronology.
abstract DurationField	days() Get the days duration field for this chronology.
abstract DateTimeField	era() Get the era field for this chronology.
abstract DurationField	eras() Get the eras duration field for this chronology.
abstract int[]	get(ReadablePartial partial, long instant) Gets the values of a partial from an instant.
abstract int[]	get(ReadablePeriod period, long duration) Gets the values of a period from an interval.
abstract int[]	get(ReadablePeriod period, long startInstant, long endInstant) Gets the values of a period from an interval.
abstract 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.
abstract 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.
abstract long	getDateTimeMillis(long instant, int hourOfDay, int minuteOfHour, int secondOfMinute, int millisOfSecond) Returns a datetime millisecond instant, from from the given instant, hour, minute, second, and millisecond values.
abstract DateTimeZone	getZone() Returns the DateTimeZone that this Chronology operates in, or null if unspecified.
abstract DateTimeField	halfdayOfDay() Get the AM(0) PM(1) field for this chronology.
abstract DurationField	halfdays() Get the halfdays duration field for this chronology.
abstract DateTimeField	hourOfDay() Get the hour of day (0-23) field for this chronology.
abstract DateTimeField	hourOfHalfday() Get the hour of am/pm (0-11) field for this chronology.
abstract DurationField	hours() Get the hours duration field for this chronology.
abstract DurationField	millis() Get the millis duration field for this chronology.
abstract DateTimeField	millisOfDay() Get the millis of day field for this chronology.
abstract DateTimeField	millisOfSecond() Get the millis of second field for this chronology.
abstract DateTimeField	minuteOfDay() Get the minute of day field for this chronology.
abstract DateTimeField	minuteOfHour() Get the minute of hour field for this chronology.
abstract DurationField	minutes() Get the minutes duration field for this chronology.
abstract DateTimeField	monthOfYear() Get the month of year field for this chronology.
abstract DurationField	months() Get the months duration field for this chronology.
abstract DateTimeField	secondOfDay() Get the second of day field for this chronology.
abstract DateTimeField	secondOfMinute() Get the second of minute field for this chronology.
abstract DurationField	seconds() Get the seconds duration field for this chronology.
abstract long	set(ReadablePartial partial, long instant) Sets the partial into the instant.
abstract java.lang.String	toString() Gets a debugging toString.
abstract void	validate(ReadablePartial partial, int[] values) Validates whether the values are valid for the fields of a partial instant.
abstract DateTimeField	weekOfWeekyear() Get the week of a week based year field for this chronology.
abstract DurationField	weeks() Get the weeks duration field for this chronology.
abstract DateTimeField	weekyear() Get the year of a week based year field for this chronology.
abstract DateTimeField	weekyearOfCentury() Get the year of a week based year in a century field for this chronology.
abstract DurationField	weekyears() Get the weekyears duration field for this chronology.
abstract Chronology	withUTC() Returns an instance of this Chronology that operates in the UTC time zone.
abstract Chronology	withZone(DateTimeZone zone) Returns an instance of this Chronology that operates in any time zone.
abstract DateTimeField	year() Get the year field for this chronology.
abstract DateTimeField	yearOfCentury() Get the year of century field for this chronology.
abstract DateTimeField	yearOfEra() Get the year of era field for this chronology.
abstract DurationField	years() Get the years duration field for this chronology.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Chronology

public Chronology()

Method Detail

getZone

public abstract DateTimeZone getZone()

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

Returns:

the DateTimeZone, null if unspecified

withUTC

public abstract Chronology withUTC()

Returns an instance of this Chronology that operates in the UTC time zone. Chronologies that do not operate in a time zone or are already UTC must return themself.

Returns:

a version of this chronology that ignores time zones

withZone

public abstract Chronology withZone(DateTimeZone zone)

Returns an instance of this Chronology that operates in any time zone.

Parameters:

zone - to use, or default if null

Returns:

a version of this chronology with a specific time zone

See Also:

ZonedChronology

getDateTimeMillis

public abstract 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

Throws:

java.lang.IllegalArgumentException - if the values are invalid

getDateTimeMillis

public abstract 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

Throws:

java.lang.IllegalArgumentException - if the values are invalid

getDateTimeMillis

public abstract long getDateTimeMillis(long instant,
                                       int hourOfDay,
                                       int minuteOfHour,
                                       int secondOfMinute,
                                       int millisOfSecond)

Returns a datetime millisecond instant, from from the given instant, 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:

instant - instant to start from

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

validate

public abstract void validate(ReadablePartial partial,
                              int[] values)

Validates whether the values are valid for the fields of a partial instant.

Parameters:

partial - the partial instant to validate

values - the values to validate, not null, match fields in partial

Throws:

java.lang.IllegalArgumentException - if the instant is invalid

get

public abstract int[] get(ReadablePartial partial,
                          long instant)

Gets the values of a partial from an instant.

Parameters:

partial - the partial instant to use

instant - the instant to query

Returns:

the values of this partial extracted from the instant

set

public abstract long set(ReadablePartial partial,
                         long instant)

Sets the partial into the instant.

Parameters:

partial - the partial instant to use

instant - the instant to update

Returns:

the updated instant

get

public abstract int[] get(ReadablePeriod period,
                          long startInstant,
                          long endInstant)

Gets the values of a period from an interval.

Parameters:

period - the period instant to use

startInstant - the start instant of an interval to query

endInstant - the start instant of an interval to query

Returns:

the values of the period extracted from the interval

get

public abstract int[] get(ReadablePeriod period,
                          long duration)

Gets the values of a period from an interval.

Parameters:

period - the period instant to use

duration - the duration to query

Returns:

the values of the period extracted from the duration

add

public abstract long add(ReadablePeriod period,
                         long instant,
                         int scalar)

Adds the period to the instant, specifying the number of times to add.

Parameters:

period - the period to add, null means add nothing

instant - the instant to add to

scalar - the number of times to add

Returns:

the updated instant

add

public abstract long add(long instant,
                         long duration,
                         int scalar)

Adds the duration to the instant, specifying the number of times to add.

Parameters:

instant - the instant to add to

duration - the duration to add

scalar - the number of times to add

Returns:

the updated instant

millis

public abstract DurationField millis()

Get the millis duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

millisOfSecond

public abstract DateTimeField millisOfSecond()

Get the millis of second field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

millisOfDay

public abstract DateTimeField millisOfDay()

Get the millis of day field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

seconds

public abstract DurationField seconds()

Get the seconds duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

secondOfMinute

public abstract DateTimeField secondOfMinute()

Get the second of minute field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

secondOfDay

public abstract DateTimeField secondOfDay()

Get the second of day field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

minutes

public abstract DurationField minutes()

Get the minutes duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

minuteOfHour

public abstract DateTimeField minuteOfHour()

Get the minute of hour field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

minuteOfDay

public abstract DateTimeField minuteOfDay()

Get the minute of day field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

hours

public abstract DurationField hours()

Get the hours duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

hourOfDay

public abstract DateTimeField hourOfDay()

Get the hour of day (0-23) field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

clockhourOfDay

public abstract DateTimeField clockhourOfDay()

Get the hour of day (offset to 1-24) field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

halfdays

public abstract DurationField halfdays()

Get the halfdays duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

hourOfHalfday

public abstract DateTimeField hourOfHalfday()

Get the hour of am/pm (0-11) field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

clockhourOfHalfday

public abstract DateTimeField clockhourOfHalfday()

Get the hour of am/pm (offset to 1-12) field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

halfdayOfDay

public abstract DateTimeField halfdayOfDay()

Get the AM(0) PM(1) field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

days

public abstract DurationField days()

Get the days duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

dayOfWeek

public abstract DateTimeField dayOfWeek()

Get the day of week field for this chronology.

DayOfWeek values are defined in DateTimeConstants. They use the ISO definitions, where 1 is Monday and 7 is Sunday.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

dayOfMonth

public abstract DateTimeField dayOfMonth()

Get the day of month field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

dayOfYear

public abstract DateTimeField dayOfYear()

Get the day of year field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

weeks

public abstract DurationField weeks()

Get the weeks duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

weekOfWeekyear

public abstract DateTimeField weekOfWeekyear()

Get the week of a week based year field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

weekyears

public abstract DurationField weekyears()

Get the weekyears duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

weekyear

public abstract DateTimeField weekyear()

Get the year of a week based year field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

weekyearOfCentury

public abstract DateTimeField weekyearOfCentury()

Get the year of a week based year in a century field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

months

public abstract DurationField months()

Get the months duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

monthOfYear

public abstract DateTimeField monthOfYear()

Get the month of year field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

years

public abstract DurationField years()

Get the years duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

year

public abstract DateTimeField year()

Get the year field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

yearOfEra

public abstract DateTimeField yearOfEra()

Get the year of era field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

yearOfCentury

public abstract DateTimeField yearOfCentury()

Get the year of century field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

centuries

public abstract DurationField centuries()

Get the centuries duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

centuryOfEra

public abstract DateTimeField centuryOfEra()

Get the century of era field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

eras

public abstract DurationField eras()

Get the eras duration field for this chronology.

Returns:

DurationField or UnsupportedDurationField if unsupported

era

public abstract DateTimeField era()

Get the era field for this chronology.

Returns:

DateTimeField or UnsupportedDateTimeField if unsupported

toString

public abstract java.lang.String toString()

Gets a debugging toString.

Overrides:

toString in class java.lang.Object

Returns:

a debugging string