Class java.util.TimeZone - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class java.util.TimeZone

java.lang.Object
   |
   +----java.util.TimeZone

public abstract class TimeZone
extends Object
implements Serializable, Cloneable

TimeZone represents a time zone offset, and also figures out daylight savings.

Typically, you get a TimeZone using getDefault which creates a TimeZone based on the time zone where the program is running. For example, for a program running in Japan, getDefault creates a TimeZone object based on Japanese Standard Time.

You can also get a TimeZone using getTimeZone along with a time zone ID. For instance, the time zone ID for the Pacific Standard Time zone is "PST". So, you can get a PST TimeZone object with:

 TimeZone tz = TimeZone.getTimeZone("PST");

You can use getAvailableIDs method to iterate through all the supported time zone IDs. You can then choose a supported ID to get a favorite TimeZone.

See Also:: Calendar, GregorianCalendar, SimpleTimeZone

TimeZone()

clone(): Overrides Cloneable
getAvailableIDs(): Gets all the available IDs supported.
getAvailableIDs(int): Gets the available IDs according to the given time zone offset.
getDefault(): Gets the default TimeZone for this host.
getID(): Gets the ID of this time zone.
getOffset(int, int, int, int, int, int): Gets the time zone offset, for current date, modified in case of daylight savings.
getRawOffset(): Gets unmodified offset, NOT modified in case of daylight savings.
getTimeZone(String): Gets the TimeZone for the given ID.
inDaylightTime(Date): Queries if the given date is in Daylight Savings Time in this time zone.
setDefault(TimeZone): Sets time zone to using the given TimeZone.
setID(String): Sets the time zone ID.
setRawOffset(int): Sets the base time zone offset to GMT.
useDaylightTime(): Queries if this time zone uses Daylight Savings Time.

TimeZone

 public TimeZone()

getOffset

 public abstract int getOffset(int era,
                               int year,
                               int month,
                               int day,
                               int dayOfWeek,
                               int milliseconds)

Gets the time zone offset, for current date, modified in case of daylight savings. This is the offset to add *to* UTC to get local time.

Parameters:: era - the era of the given date.; year - the year in the given date.; month - the month in the given date. Month is 0-based. e.g., 0 for January.; day - the day-in-month of the given date.; dayOfWeek - the day-of-week of the given date.; milliseconds - the millis in day in standard local time.
Returns:: the offset to add *to* GMT to get local time.

setRawOffset

 public abstract void setRawOffset(int offsetMillis)

Sets the base time zone offset to GMT. This is the offset to add *to* UTC to get local time.

Parameters:: offsetMillis - the given base time zone offset to GMT.

getRawOffset

 public abstract int getRawOffset()

Gets unmodified offset, NOT modified in case of daylight savings. This is the offset to add *to* UTC to get local time.

Returns:: the unmodified offset to add *to* UTC to get local time.

getID

 public String getID()

Gets the ID of this time zone.

Returns:: the ID of this time zone.

setID

 public void setID(String ID)

Sets the time zone ID. This does not change any other data in the time zone object.

Parameters:: ID - the new time zone ID.

useDaylightTime

 public abstract boolean useDaylightTime()

Queries if this time zone uses Daylight Savings Time.

Returns:: true if this time zone uses Daylight Savings Time, false, otherwise.

inDaylightTime

 public abstract boolean inDaylightTime(Date date)

Queries if the given date is in Daylight Savings Time in this time zone.

Parameters:: date - the given Date.
Returns:: true if the given date is in Daylight Savings Time, false, otherwise.

getTimeZone

 public static synchronized TimeZone getTimeZone(String ID)

Gets the TimeZone for the given ID.

Parameters:: ID - the given ID.
Returns:: a TimeZone, or null if the given ID is not recognized.

getAvailableIDs

 public static synchronized String[] getAvailableIDs(int rawOffset)

Gets the available IDs according to the given time zone offset.

Parameters:: rawOffset - the given time zone GMT offset.
Returns:: an array of IDs, where the time zone for that ID has the specified GMT offset. For example, "America/Phoenix" and "America/Denver" both have GMT-07:00, but differ in daylight savings behavior.

getAvailableIDs

 public static synchronized String[] getAvailableIDs()

Gets all the available IDs supported.

Returns:: an array of IDs.

getDefault

 public static synchronized TimeZone getDefault()

Gets the default TimeZone for this host.

Returns:: a default TimeZone.

setDefault

 public static synchronized void setDefault(TimeZone zone)

Sets time zone to using the given TimeZone.

Parameters:: zone - the given time zone.

clone

 public Object clone()

Overrides Cloneable

Overrides:: clone in class Object

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Submit a bug or feature - Version 1.1.8 of Java Platform API Specification
Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries.
Copyright 1995-1999 Sun Microsystems, Inc. 901 San Antonio Road,
Palo Alto, California, 94303, U.S.A. All Rights Reserved.