com.google.gwt.i18n.client
Class TimeZone

java.lang.Object
  com.google.gwt.i18n.client.TimeZone

public class TimeZone
extends java.lang.Object

The TimeZone class implements a time zone information source for client applications. The time zone object is instantiated from a TimeZoneData object, which is made from a JSON string that contains all the data needed for the specified time zone. Applications can instantiate a time zone statically, in which case the data could be retrieved from the TimeZoneConstants class. Applications can also choose to instantiate from a string obtained from a server. The time zone string contains locale specific data. If the application only uses a short representation, the English data will usually satisfy the user's need. In the case that only the time zone offset is known, there is a decent fallback that only uses the time zone offset to create a TimeZone object.

createTimeZone

public static TimeZone createTimeZone(java.lang.String tzJSON)

This factory method creates a time zone instance from a JSON string that contains the time zone information for desired time zone. Applications can get such a string from the TimeZoneConstants class, or it can request the string from the server. Either way, the application obtains the original string from the data provided in the TimeZoneConstant.properties file, which was carefully prepared from CLDR and Olson time zone database.

Parameters:

tzJSON - JSON string that contains time zone data.

Returns:

a new time zone object.

createTimeZone

public static TimeZone createTimeZone(TimeZoneInfo timezoneData)

createTimeZone

public static TimeZone createTimeZone(int timeZoneOffsetInMinutes)

This factory method provides a decent fallback to create a time zone object just based on a given time zone offset.

Parameters:

timeZoneOffsetInMinutes - time zone offset in minutes.

Returns:

a new time zone object.

getDaylightAdjustment

public int getDaylightAdjustment(java.util.Date date)

Return the daylight savings time adjustment, in minutes, for the given date. If daylight savings time is in effect on the given date, the number will be positive, otherwise 0.

Parameters:

date - the date to check.

Returns:

offset amount.

getGMTString

public java.lang.String getGMTString(java.util.Date date)

Return the GMT representation of this time zone object.

Parameters:

date - The date from which the time information should be extracted

Returns:

A GMT representation of the time given by the date.

getID

public java.lang.String getID()

Return time zone id for this time zone. For time zone objects that have been instantiated from a time zone offset, the POSIX time zone id will be returned.

Returns:

time zone id.

getLongName

public java.lang.String getLongName(java.util.Date date)

Returns the long version of the time zone name for the given date; the result of this method will be different if daylight savings time is in effect.

Parameters:

date - The date for which the long time zone name is returned

Returns:

long time zone name.

getOffset

public int getOffset(java.util.Date date)

Returns the RFC representation of the time zone name for the given date. To be consistent with JDK/Javascript API, west of Greenwich will be positive.

Parameters:

date - The date for which time to retrieve time zone offset.

Returns:

time zone offset in minutes.

getRFCTimeZoneString

public java.lang.String getRFCTimeZoneString(java.util.Date date)

To get RFC representation of certain time zone name for given date.

Parameters:

date - The date for which time to retrieve RFC time zone string.

Returns:

RFC time zone string.

getShortName

public java.lang.String getShortName(java.util.Date date)

Returns the short time zone name for a given date.

Parameters:

date - The date for which time to retrieve short time zone.

Returns:

short time zone name.

getStandardOffset

public int getStandardOffset()

Returns the standard time zone offset in minutes.

Returns:

the standard time zone offset, in minutes

isDaylightTime

public boolean isDaylightTime(java.util.Date date)

Check whether the given date and time falls within a daylight savings time period.

Parameters:

date - and time to check.

Returns:

true if daylight savings time is in effect.