org.joda.time.tz

Class FixedDateTimeZone

java.lang.Object

org.joda.time.DateTimeZone

org.joda.time.tz.FixedDateTimeZone

All Implemented Interfaces:

Serializable

public final class FixedDateTimeZone
extends DateTimeZone

Basic DateTimeZone implementation that has a fixed name key and offsets.

FixedDateTimeZone is thread-safe and immutable.

Since:

1.0

See Also:

Serialized Form

Field Summary

Fields inherited from class org.joda.time.DateTimeZone

DEFAULT_TZ_DATA_PATH, UTC

Constructor Summary

Constructors

Constructor and Description
FixedDateTimeZone(String id, String nameKey, int wallOffset, int standardOffset)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj) Compare this datetime zone with another.
String	getNameKey(long instant) Returns a non-localized name that is unique to this time zone.
int	getOffset(long instant) Gets the millisecond offset to add to UTC to get local time.
int	getOffsetFromLocal(long instantLocal) Gets the millisecond offset to subtract from local time to get UTC time.
int	getStandardOffset(long instant) Gets the raw millisecond offset to add to UTC.
int	hashCode() Gets a hash code compatible with equals.
boolean	isFixed() Returns true if this time zone has no transitions.
long	nextTransition(long instant) Advances the given instant to where the time zone offset or name changes.
long	previousTransition(long instant) Retreats the given instant to where the time zone offset or name changes.
TimeZone	toTimeZone() Override to return the correct timezone instance.

Methods inherited from class org.joda.time.DateTimeZone

adjustOffset, convertLocalToUTC, convertLocalToUTC, convertUTCToLocal, forID, forOffsetHours, forOffsetHoursMinutes, forOffsetMillis, forTimeZone, getAvailableIDs, getDefault, getID, getMillisKeepLocal, getName, getName, getNameProvider, getOffset, getProvider, getShortName, getShortName, isLocalDateTimeGap, isStandardOffset, setDefault, setNameProvider, setProvider, toString, writeReplace

Methods inherited from class java.lang.Object

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

Constructor Detail

FixedDateTimeZone

public FixedDateTimeZone(String id,
                         String nameKey,
                         int wallOffset,
                         int standardOffset)

Method Detail

getNameKey

public String getNameKey(long instant)

Description copied from class: DateTimeZone

Returns a non-localized name that is unique to this time zone. It can be combined with id to form a unique key for fetching localized names.

Specified by:

getNameKey in class DateTimeZone

Parameters:

instant - milliseconds from 1970-01-01T00:00:00Z to get the name for

Returns:

name key or null if id should be used for names

getOffset

public int getOffset(long instant)

Description copied from class: DateTimeZone

Gets the millisecond offset to add to UTC to get local time.

This returns the actual offset from UTC for the zone at the specified instant. If the method is called with a different instant, the offset returned may be different as a result of daylight saving or other government rule changes.

Specified by:

getOffset in class DateTimeZone

Parameters:

instant - milliseconds from 1970-01-01T00:00:00Z to get the offset for

Returns:

the millisecond offset to add to UTC to get local time

getStandardOffset

public int getStandardOffset(long instant)

Description copied from class: DateTimeZone

Gets the raw millisecond offset to add to UTC.

This should be treated as an implementation detail. End-users should use DateTimeZone.getOffset(long).

This returns the raw offset from UTC for the zone at the specified instant, effectively ignoring DST. If the method is called with a different instant, the offset returned may be different as a result of government rule changes.

This method should be named getRawOffset() but cannot be renamed for compatibility reasons.

Specified by:

getStandardOffset in class DateTimeZone

Parameters:

instant - milliseconds from 1970-01-01T00:00:00Z to get the offset for

Returns:

the millisecond offset to add to UTC to get local time

getOffsetFromLocal

public int getOffsetFromLocal(long instantLocal)

Description copied from class: DateTimeZone

Gets the millisecond offset to subtract from local time to get UTC time. This offset can be used to undo adding the offset obtained by getOffset.

 millisLocal == millisUTC   + getOffset(millisUTC)
 millisUTC   == millisLocal - getOffsetFromLocal(millisLocal)
 

NOTE: After calculating millisLocal, some error may be introduced. At offset transitions (due to DST or other historical changes), ranges of local times may map to different UTC times.

For overlaps (where the local time is ambiguous), this method returns the offset applicable before the gap. The effect of this is that any instant calculated using the offset from an overlap will be in "summer" time.

For gaps, this method returns the offset applicable before the gap, ie "winter" offset. However, the effect of this is that any instant calculated using the offset from a gap will be after the gap, in "summer" time.

For example, consider a zone with a gap from 01:00 to 01:59:
Input: 00:00 (before gap) Output: Offset applicable before gap DateTime: 00:00
Input: 00:30 (before gap) Output: Offset applicable before gap DateTime: 00:30
Input: 01:00 (in gap) Output: Offset applicable before gap DateTime: 02:00
Input: 01:30 (in gap) Output: Offset applicable before gap DateTime: 02:30
Input: 02:00 (after gap) Output: Offset applicable after gap DateTime: 02:00
Input: 02:30 (after gap) Output: Offset applicable after gap DateTime: 02:30

NOTE: Prior to v2.0, the DST overlap behaviour was not defined and varied by hemisphere. Prior to v1.5, the DST gap behaviour was also not defined. In v2.4, the documentation was clarified again.

Overrides:

getOffsetFromLocal in class DateTimeZone

Parameters:

instantLocal - the millisecond instant, relative to this time zone, to get the offset for

Returns:

the millisecond offset to subtract from local time to get UTC time

isFixed

public boolean isFixed()

Description copied from class: DateTimeZone

Returns true if this time zone has no transitions.

Specified by:

isFixed in class DateTimeZone

Returns:

true if no transitions

nextTransition

public long nextTransition(long instant)

Description copied from class: DateTimeZone

Advances the given instant to where the time zone offset or name changes. If the instant returned is exactly the same as passed in, then no changes occur after the given instant.

Specified by:

nextTransition in class DateTimeZone

Parameters:

instant - milliseconds from 1970-01-01T00:00:00Z

Returns:

milliseconds from 1970-01-01T00:00:00Z

previousTransition

public long previousTransition(long instant)

Description copied from class: DateTimeZone

Retreats the given instant to where the time zone offset or name changes. If the instant returned is exactly the same as passed in, then no changes occur before the given instant.

Specified by:

previousTransition in class DateTimeZone

Parameters:

instant - milliseconds from 1970-01-01T00:00:00Z

Returns:

milliseconds from 1970-01-01T00:00:00Z

toTimeZone

public TimeZone toTimeZone()

Override to return the correct timezone instance.

Overrides:

toTimeZone in class DateTimeZone

Returns:

the closest matching TimeZone object

Since:

1.5

equals

public boolean equals(Object obj)

Description copied from class: DateTimeZone

Compare this datetime zone with another.

Specified by:

equals in class DateTimeZone

Parameters:

obj - the object to compare with

Returns:

true if equal, based on the ID and all internal rules

hashCode

public int hashCode()

Description copied from class: DateTimeZone

Gets a hash code compatible with equals.

Overrides:

hashCode in class DateTimeZone

Returns:

suitable hashcode