public abstract class

TimeZone

extends Object
java.lang.Object
   ↳ java.util.TimeZone

Class Overview

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");

This class is a pure subset of the java.util.TimeZone class in J2SE.

The only time zone ID that is required to be supported is "GMT".

Apart from the methods and variables being subset, the semantics of the getTimeZone() method may also be subset: custom IDs such as "GMT-8:00" are not required to be supported.

See Also

Summary

Public Constructors
TimeZone()
Public Methods
static String[] getAvailableIDs()
Gets all the available IDs supported.
synchronized static TimeZone getDefault()
Gets the default TimeZone for this host.
String getID()
Gets the ID of this time zone.
abstract int getOffset(int era, int year, int month, int day, int dayOfWeek, int millis)
Gets offset in milliseconds, for current date, modified in case of daylight savings.
abstract int getRawOffset()
Gets the GMT offset in milliseconds for this time zone.
synchronized static TimeZone getTimeZone(String ID)
Gets the TimeZone for the given ID.
abstract boolean useDaylightTime()
Queries if this time zone uses Daylight Savings Time.
[Expand]
Inherited Methods
From class java.lang.Object

Public Constructors

public TimeZone ()

Public Methods

public static String[] getAvailableIDs ()

Gets all the available IDs supported.

Returns
  • an array of IDs.

public static synchronized TimeZone getDefault ()

Gets the default TimeZone for this host. The source of the default TimeZone may vary with implementation.

Returns
  • a default TimeZone.

public String getID ()

Gets the ID of this time zone.

Returns
  • the ID of this time zone.

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

Gets offset in milliseconds, for current date, modified in case of daylight savings. This is the offset to add *to* GMT to get local time. Gets the time zone offset, for current date, modified in case of daylight savings. This is the offset to add *to* GMT to get local time. Assume that the start and end month are distinct. This method may return incorrect results for rules that start at the end of February (e.g., last Sunday in February) or the beginning of March (e.g., March 1).

Parameters
era The era of the given date (0 = BC, 1 = AD).
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.
millis The milliseconds in day in standard local time.
Returns
  • The offset to add *to* GMT to get local time.
Throws
IllegalArgumentException the era, month, day, dayOfWeek, or millis parameters are out of range

public abstract int getRawOffset ()

Gets the GMT offset in milliseconds for this time zone.

Returns
  • the GMT offset for this time zone.

public static synchronized TimeZone getTimeZone (String ID)

Gets the TimeZone for the given ID.

Parameters
ID the ID for a TimeZone, either an abbreviation such as "GMT", or a full name such as "America/Los_Angeles".

The only time zone ID that is required to be supported is "GMT".
Returns
  • the specified TimeZone, or the GMT zone if the given ID cannot be understood.

public abstract boolean useDaylightTime ()

Queries if this time zone uses Daylight Savings Time.

Returns
  • if this time zone uses Daylight Savings Time.