TimeZone (ICU4J 76)

java.lang.Object
- com.ibm.icu.util.TimeZone

All Implemented Interfaces:

Freezable<TimeZone>, Serializable, Cloneable

Direct Known Subclasses:

BasicTimeZone
```
public abstract class TimeZone
extends Object
implements Serializable, Cloneable, Freezable<TimeZone>
```
[icu enhancement] ICU's replacement for java.util.TimeZone. Methods, fields, and other functionality specific to ICU are labeled '[icu]'.

TimeZone represents a time zone offset, and also computes 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(String) along with a time zone ID. For instance, the time zone ID for the U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a U.S. Pacific Time TimeZone object with:
```
 TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles");
 
```
You can use the getAvailableIDs() method to iterate through all the supported time zone IDs, or getCanonicalID method to check if a time zone ID is supported or not. You can then choose a supported ID to get a TimeZone. If the time zone you want is not represented by one of the supported IDs, then you can create a custom time zone ID with the following syntax:
```
 GMT[+|-]hh[[:]mm]
 
```
For example, you might specify GMT+14:00 as a custom time zone ID. The TimeZone that is returned when you specify a custom time zone ID uses the specified offset from GMT(=UTC) and does not observe daylight saving time. For example, you might specify GMT+14:00 as a custom time zone ID to create a TimeZone representing 14 hours ahead of GMT (with no daylight saving time). In addition, getCanonicalID can also be used to normalize a custom time zone ID.
For compatibility with JDK 1.1.x, some other three-letter time zone IDs (such as "PST", "CTT", "AST") are also supported. However, their use is deprecated because the same abbreviation is often used for multiple time zones (for example, "CST" could be U.S. "Central Standard Time" and "China Standard Time"), and the Java platform can then only recognize one of them.
Note: Starting from ICU4J 4.0, you can optionally choose JDK TimeZone as the time zone implementation. The TimeZone factory method getTimeZone creates an instance of ICU's own TimeZone subclass by default. If you want to use the JDK implementation always, you can set the default time zone implementation type by the new method setDefaultTimeZoneType. Alternatively, you can change the initial default implementation type by setting a property below.
```
 #
 # The default TimeZone implementation type used by the ICU TimeZone
 # factory method. [ ICU | JDK ]
 #
 com.ibm.icu.util.TimeZone.DefaultTimeZoneType = ICU
 
```
This property is included in ICUConfig.properties in com.ibm.icu package. When the TimeZone class is loaded, the initialization code checks if the property com.ibm.icu.util.TimeZone.DefaultTimeZoneType=xxx is defined by the system properties. If not available, then it loads ICUConfig.properties to get the default time zone implementation type. The property setting is only used for the initial default value and you can change the default type by calling setDefaultTimeZoneType at runtime.
Author:

Mark Davis, Deborah Goldsmith, Chen-Lieh Huang, Alan Liu

See Also:

Calendar, GregorianCalendar, SimpleTimeZone, Serialized Form

Status:
Stable ICU 2.0.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`TimeZone.SystemTimeZoneType` [icu] System time zone type constants used by filtering zones in `getAvailableIDs(SystemTimeZoneType, String, Integer)`

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`GENERIC_LOCATION` [icu] A style specifier for `getDisplayName()` indicating a long name derived from the timezone's fallback name, such as "United States (Los Angeles)."
`static TimeZone`	`GMT_ZONE` [icu] The immutable GMT (=UTC) time zone.
`static int`	`LONG` A style specifier for `getDisplayName()` indicating a long name, such as "Pacific Standard Time."
`static int`	`LONG_GENERIC` [icu] A style specifier for `getDisplayName()` indicating a long generic name, such as "Pacific Time."
`static int`	`LONG_GMT` [icu] A style specifier for `getDisplayName()` indicating a long name derived from the timezone's offset, such as "GMT-08:00."
`static int`	`SHORT` A style specifier for `getDisplayName()` indicating a short name, such as "PST."
`static int`	`SHORT_COMMONLY_USED` [icu] A style specifier for `getDisplayName()` indicating a short name derived from the timezone's short standard or daylight timezone name ignoring commonlyUsed, such as "PDT."
`static int`	`SHORT_GENERIC` [icu] A style specifier for `getDisplayName()` indicating a short generic name, such as "PT."
`static int`	`SHORT_GMT` [icu] A style specifier for `getDisplayName()` indicating a short name derived from the timezone's offset, such as "-0800."
`static int`	`TIMEZONE_ICU` [icu] A time zone implementation type indicating ICU's own TimeZone used by `getTimeZone`, `setDefaultTimeZoneType` and `getDefaultTimeZoneType`.
`static int`	`TIMEZONE_JDK` [icu] A time zone implementation type indicating the `TimeZone` used by `getTimeZone`, `setDefaultTimeZoneType` and `getDefaultTimeZoneType`.
`static TimeZone`	`UNKNOWN_ZONE` [icu] The immutable (frozen) "unknown" time zone.
`static String`	`UNKNOWN_ZONE_ID` [icu] The time zone ID reserved for unknown time zone.

Constructor Summary

Constructors
Modifier Constructor and Description

TimeZone()
Default constructor.

protected TimeZone(String ID)
Deprecated.
This API is ICU internal only.

Constructors
Modifier	Constructor and Description
	`TimeZone()` Default constructor.
`protected`	`TimeZone(String ID)` Deprecated. This API is ICU internal only.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`Object`	`clone()` Overrides clone.
`TimeZone`	`cloneAsThawed()` Provides for the clone operation.
`static int`	`countEquivalentIDs(String id)` [icu] Returns the number of IDs in the equivalency group that includes the given ID.
`boolean`	`equals(Object obj)` Overrides equals.
`static TimeZone`	`forLocaleOrDefault(Locale locale)` Deprecated. This API is ICU internal only.
`static TimeZone`	`forULocaleOrDefault(ULocale locale)` Deprecated. This API is ICU internal only.
`TimeZone`	`freeze()` Freezes the object.
`static String[]`	`getAvailableIDs()` Return a new String array containing all system TimeZone IDs.
`static String[]`	`getAvailableIDs(int rawOffset)` Return a new String array containing all system TimeZone IDs with the given raw offset from GMT.
`static String[]`	`getAvailableIDs(String country)` Return a new String array containing all system TimeZone IDs associated with the given country.
`static Set<String>`	`getAvailableIDs(TimeZone.SystemTimeZoneType zoneType, String region, Integer rawOffset)` [icu] Returns a set of time zone ID strings with the given filter conditions.
`static String`	`getCanonicalID(String id)` [icu] Returns the canonical system time zone ID or the normalized custom time zone ID for the given time zone ID.
`static String`	`getCanonicalID(String id, boolean[] isSystemID)` [icu] Returns the canonical system time zone ID or the normalized custom time zone ID for the given time zone ID.
`static TimeZone`	`getDefault()` Gets the default `TimeZone` for this host.
`static int`	`getDefaultTimeZoneType()` [icu] Returns the default time zone type currently used.
`String`	`getDisplayName()` Returns a name of this time zone suitable for presentation to the user in the default `DISPLAY` locale.
`String`	`getDisplayName(boolean daylight, int style)` Returns a name of this time zone suitable for presentation to the user in the default `DISPLAY` locale.
`String`	`getDisplayName(boolean daylight, int style, Locale locale)` Returns a name of this time zone suitable for presentation to the user in the specified locale.
`String`	`getDisplayName(boolean daylight, int style, ULocale locale)` Returns a name of this time zone suitable for presentation to the user in the specified locale.
`String`	`getDisplayName(Locale locale)` Returns a name of this time zone suitable for presentation to the user in the specified locale.
`String`	`getDisplayName(ULocale locale)` Returns a name of this time zone suitable for presentation to the user in the specified locale.
`int`	`getDSTSavings()` Returns the amount of time to be added to local standard time to get local wall clock time.
`static String`	`getEquivalentID(String id, int index)` Returns an ID in the equivalency group that includes the given ID.
`static TimeZone`	`getFrozenTimeZone(String ID)` Gets the `TimeZone` for the given ID.
`static String`	`getIanaID(String id)` Returns the preferred time zone ID in the IANA database for the given time zone ID.
`String`	`getID()` Gets the ID of this time zone.
`static String`	`getIDForWindowsID(String winid, String region)` [icu] Converts a Windows time zone ID to an equivalent system time zone ID for a region.
`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.
`int`	`getOffset(long date)` Returns the offset of this time zone from UTC at the specified date.
`void`	`getOffset(long date, boolean local, int[] offsets)` Returns the time zone raw and GMT offset for the given moment in time.
`abstract int`	`getRawOffset()` Gets unmodified offset, NOT modified in case of daylight savings.
`static String`	`getRegion(String id)` [icu] Returns the region code associated with the given system time zone ID.
`static TimeZone`	`getTimeZone(String ID)` Gets the `TimeZone` for the given ID.
`static TimeZone`	`getTimeZone(String ID, int type)` Gets the `TimeZone` for the given ID and the timezone type.
`static String`	`getTZDataVersion()` [icu] Returns the time zone data version currently used by ICU.
`static String`	`getWindowsID(String id)` [icu] Converts a system time zone ID to an equivalent Windows time zone ID.
`int`	`hashCode()` Overrides hashCode.
`boolean`	`hasSameRules(TimeZone other)` Returns true if this zone has the same rule and offset as another zone.
`abstract boolean`	`inDaylightTime(Date date)` Queries if the given date is in daylight savings time in this time zone.
`boolean`	`isFrozen()` Determines whether the object has been frozen or not.
`boolean`	`observesDaylightTime()` Queries if this time zone is in daylight saving time or will observe daylight saving time at any future time.
`static void`	`setDefault(TimeZone tz)` Sets the `TimeZone` that is returned by the `getDefault` method.
`static void`	`setDefaultTimeZoneType(int type)` Sets the default time zone type used by `getTimeZone`.
`static void`	`setICUDefault(TimeZone tz)` Deprecated. This API is ICU internal only.
`void`	`setID(String ID)` Sets the time zone ID.
`abstract void`	`setRawOffset(int offsetMillis)` Sets the base time zone offset to GMT.
`abstract boolean`	`useDaylightTime()` Queries if this time zone uses daylight savings time.

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - TIMEZONE_ICU
```
public static final int TIMEZONE_ICU
```
    [icu] A time zone implementation type indicating ICU's own TimeZone used by getTimeZone, setDefaultTimeZoneType and getDefaultTimeZoneType.
    
    See Also:
    
    Constant Field Values
    
    Status:
    Stable ICU 4.0.
  - TIMEZONE_JDK
```
public static final int TIMEZONE_JDK
```
    [icu] A time zone implementation type indicating the TimeZone used by getTimeZone, setDefaultTimeZoneType and getDefaultTimeZoneType.
    
    See Also:
    
    Constant Field Values
    
    Status:
    Stable ICU 4.0.
  - SHORT
```
public static final int SHORT
```
    A style specifier for getDisplayName() indicating a short name, such as "PST."
    
    See Also:
    
    LONG, Constant Field Values
    
    Status:
    Stable ICU 2.0.
  - LONG
```
public static final int LONG
```
    A style specifier for getDisplayName() indicating a long name, such as "Pacific Standard Time."
    
    See Also:
    
    SHORT, Constant Field Values
    
    Status:
    Stable ICU 2.0.
  - SHORT_GENERIC
```
public static final int SHORT_GENERIC
```
    [icu] A style specifier for getDisplayName() indicating a short generic name, such as "PT."
    
    See Also:
    
    LONG_GENERIC, Constant Field Values
    
    Status:
    Stable ICU 4.4.
  - LONG_GENERIC
```
public static final int LONG_GENERIC
```
    [icu] A style specifier for getDisplayName() indicating a long generic name, such as "Pacific Time."
    
    See Also:
    
    SHORT_GENERIC, Constant Field Values
    
    Status:
    Stable ICU 4.4.
  - SHORT_GMT
```
public static final int SHORT_GMT
```
    [icu] A style specifier for getDisplayName() indicating a short name derived from the timezone's offset, such as "-0800."
    
    See Also:
    
    LONG_GMT, Constant Field Values
    
    Status:
    Stable ICU 4.4.
  - LONG_GMT
```
public static final int LONG_GMT
```
    [icu] A style specifier for getDisplayName() indicating a long name derived from the timezone's offset, such as "GMT-08:00."
    
    See Also:
    
    SHORT_GMT, Constant Field Values
    
    Status:
    Stable ICU 4.4.
  - SHORT_COMMONLY_USED
```
public static final int SHORT_COMMONLY_USED
```
    [icu] A style specifier for getDisplayName() indicating a short name derived from the timezone's short standard or daylight timezone name ignoring commonlyUsed, such as "PDT."
    
    See Also:
    
    Constant Field Values
    
    Status:
    Stable ICU 4.4.
  - GENERIC_LOCATION
```
public static final int GENERIC_LOCATION
```
    [icu] A style specifier for getDisplayName() indicating a long name derived from the timezone's fallback name, such as "United States (Los Angeles)."
    
    See Also:
    
    Constant Field Values
    
    Status:
    Stable ICU 4.4.
  - UNKNOWN_ZONE_ID
```
public static final String UNKNOWN_ZONE_ID
```
    [icu] The time zone ID reserved for unknown time zone.
    
    See Also:
    
    getTimeZone(String), Constant Field Values
    
    Status:
    Stable ICU 4.8.
  - UNKNOWN_ZONE
```
public static final TimeZone UNKNOWN_ZONE
```
    [icu] The immutable (frozen) "unknown" time zone. It behaves like the GMT/UTC time zone but has the UNKNOWN_ZONE_ID = "Etc/Unknown". getTimeZone(String) returns a mutable clone of this time zone if the input ID is not recognized.
    
    See Also:
    
    UNKNOWN_ZONE_ID, getTimeZone(String)
    
    Status:
    Stable ICU 49.
  - GMT_ZONE
```
public static final TimeZone GMT_ZONE
```
    [icu] The immutable GMT (=UTC) time zone. Its ID is "Etc/GMT".
    
    Status:
    Stable ICU 49.
- Constructor Detail
  - TimeZone
```
public TimeZone()
```
    Default constructor. (For invocation by subclass constructors, typically implicit.)
    
    Status:
    Stable ICU 2.8.
  - TimeZone
```
@Deprecated
protected TimeZone(String ID)
```
    Deprecated. This API is ICU internal only.
    
    Constructing a TimeZone with the given time zone ID.
    
    Parameters:
    
    ID - the time zone ID.
    
    Status:
    Internal. This API is ICU internal only.
- Method Detail
  - 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.
    
    Status:
    Stable ICU 2.0.
  - getOffset
```
public int getOffset(long date)
```
    Returns the offset of this time zone from UTC at the specified date. If Daylight Saving Time is in effect at the specified date, the offset value is adjusted with the amount of daylight saving.
    
    Parameters:
    
    date - the date represented in milliseconds since January 1, 1970 00:00:00 GMT
    
    Returns:
    
    the amount of time in milliseconds to add to UTC to get local time.
    
    See Also:
    
    Calendar.ZONE_OFFSET, Calendar.DST_OFFSET, getOffset(long, boolean, int[])
    
    Status:
    Stable ICU 2.8.
  - getOffset
```
public void getOffset(long date,
                      boolean local,
                      int[] offsets)
```
    Returns the time zone raw and GMT offset for the given moment in time. Upon return, local-millis = GMT-millis + rawOffset + dstOffset. All computations are performed in the proleptic Gregorian calendar. The default implementation in the TimeZone class delegates to the 8-argument getOffset().
    
    Parameters:
    
    date - moment in time for which to return offsets, in units of milliseconds from January 1, 1970 0:00 GMT, either GMT time or local wall time, depending on local.
    
    local - if true, date is local wall time; otherwise it is in GMT time.
    
    offsets - output parameter to receive the raw offset, that is, the offset not including DST adjustments, in offsets[0], and the DST offset, that is, the offset to be added to rawOffset to obtain the total offset between local and GMT time, in offsets[1]. If DST is not in effect, the DST offset is zero; otherwise it is a positive value, typically one hour.
    
    Status:
    Stable ICU 2.8.
  - 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.
    
    Status:
    Stable ICU 2.0.
  - 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.
    
    Status:
    Stable ICU 2.0.
  - getID
```
public String getID()
```
    Gets the ID of this time zone.
    
    Returns:
    
    the ID of this time zone.
    
    Status:
    Stable ICU 2.0.
  - 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.
    
    Status:
    Stable ICU 2.0.
  - getDisplayName
```
public final String getDisplayName()
```
    Returns a name of this time zone suitable for presentation to the user in the default DISPLAY locale. This method returns the long generic name. If the display name is not available for the locale, a fallback based on the country, city, or time zone id will be used.
    
    Returns:
    
    the human-readable name of this time zone in the default locale.
    
    See Also:
    
    ULocale.Category.DISPLAY
    
    Status:
    Stable ICU 2.0.
  - getDisplayName
```
public final String getDisplayName(Locale locale)
```
    Returns a name of this time zone suitable for presentation to the user in the specified locale. This method returns the long generic name. If the display name is not available for the locale, a fallback based on the country, city, or time zone id will be used.
    
    Parameters:
    
    locale - the locale in which to supply the display name.
    
    Returns:
    
    the human-readable name of this time zone in the given locale or in the default locale if the given locale is not recognized.
    
    Status:
    Stable ICU 2.0.
  - getDisplayName
```
public final String getDisplayName(ULocale locale)
```
    Returns a name of this time zone suitable for presentation to the user in the specified locale. This method returns the long name, not including daylight savings. If the display name is not available for the locale, a fallback based on the country, city, or time zone id will be used.
    
    Parameters:
    
    locale - the ulocale in which to supply the display name.
    
    Returns:
    
    the human-readable name of this time zone in the given locale or in the default ulocale if the given ulocale is not recognized.
    
    Status:
    Stable ICU 3.2.
  - getDisplayName
```
public final String getDisplayName(boolean daylight,
                                   int style)
```
    Returns a name of this time zone suitable for presentation to the user in the default DISPLAY locale. If the display name is not available for the locale, then this method returns a string in the localized GMT offset format such as GMT[+-]HH:mm.
    
    Parameters:
    
    daylight - if true, return the daylight savings name.
    
    style - the output style of the display name. Valid styles are SHORT, LONG, SHORT_GENERIC, LONG_GENERIC, SHORT_GMT, LONG_GMT, SHORT_COMMONLY_USED or GENERIC_LOCATION.
    
    Returns:
    
    the human-readable name of this time zone in the default locale.
    
    See Also:
    
    ULocale.Category.DISPLAY
    
    Status:
    Stable ICU 2.0.
  - getDisplayName
```
public String getDisplayName(boolean daylight,
                             int style,
                             Locale locale)
```
    Returns a name of this time zone suitable for presentation to the user in the specified locale. If the display name is not available for the locale, then this method returns a string in the localized GMT offset format such as GMT[+-]HH:mm.
    
    Parameters:
    
    daylight - if true, return the daylight savings name.
    
    style - the output style of the display name. Valid styles are SHORT, LONG, SHORT_GENERIC, LONG_GENERIC, SHORT_GMT, LONG_GMT, SHORT_COMMONLY_USED or GENERIC_LOCATION.
    
    locale - the locale in which to supply the display name.
    
    Returns:
    
    the human-readable name of this time zone in the given locale or in the default locale if the given locale is not recognized.
    
    Throws:
    
    IllegalArgumentException - style is invalid.
    
    Status:
    Stable ICU 2.0.
  - getDisplayName
```
public String getDisplayName(boolean daylight,
                             int style,
                             ULocale locale)
```
    Returns a name of this time zone suitable for presentation to the user in the specified locale. If the display name is not available for the locale, then this method returns a string in the localized GMT offset format such as GMT[+-]HH:mm.
    
    Parameters:
    
    daylight - if true, return the daylight savings name.
    
    style - the output style of the display name. Valid styles are SHORT, LONG, SHORT_GENERIC, LONG_GENERIC, SHORT_GMT, LONG_GMT, SHORT_COMMONLY_USED or GENERIC_LOCATION.
    
    locale - the locale in which to supply the display name.
    
    Returns:
    
    the human-readable name of this time zone in the given locale or in the default locale if the given locale is not recognized.
    
    Throws:
    
    IllegalArgumentException - style is invalid.
    
    Status:
    Stable ICU 3.2.
  - getDSTSavings
```
public int getDSTSavings()
```
    Returns the amount of time to be added to local standard time to get local wall clock time.
    The default implementation always returns 3600000 milliseconds (i.e., one hour) if this time zone observes Daylight Saving Time. Otherwise, 0 (zero) is returned.
    If an underlying TimeZone implementation subclass supports historical Daylight Saving Time changes, this method returns the known latest daylight saving value.
    
    Returns:
    
    the amount of saving time in milliseconds
    
    Status:
    Stable ICU 2.8.
  - 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.
    Note:The default implementation of ICU TimeZone uses the tz database, which supports historic rule changes, for system time zones. With the implementation, there are time zones that used daylight savings time in the past, but no longer used currently. For example, Asia/Tokyo has never used daylight savings time since 1951. Most clients would expect that this method to return false for such case. The default implementation of this method returns true when the time zone uses daylight savings time in the current (Gregorian) calendar year.
    
    Status:
    Stable ICU 2.0.
  - observesDaylightTime
```
public boolean observesDaylightTime()
```
    Queries if this time zone is in daylight saving time or will observe daylight saving time at any future time.
    The default implementation in this class returns true if useDaylightTime() or inDaylightTime(new Date()) returns true.
    Note: This method was added for TimeZone compatibility support. The TimeZone.useDaylightTime() method only checks the last known rule(s), therefore it may return false even the zone observes daylight saving time currently. TimeZone added observesDaylightTime() to resolve the issue. In ICU, useDaylightTime() works differently. The ICU implementation checks if the zone uses daylight saving time in the current calendar year. Therefore, it will never return false if daylight saving time is currently used.
    ICU's TimeZone subclass implementations override this method to support the same behavior with TimeZone.observesDaylightTime(). Unlike useDaylightTime(), the implementation does not take past daylight saving time into account, so that this method may return false even when useDaylightTime() returns true.
    
    Returns:
    
    true if this time zone is in daylight saving time or will observe daylight saving time at any future time.
    
    See Also:
    
    useDaylightTime()
    
    Status:
    Stable ICU 49.
  - 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.
    
    Status:
    Stable ICU 2.0.
  - getTimeZone
```
public static TimeZone getTimeZone(String ID)
```
    Gets the TimeZone for the given ID.
    
    Parameters:
    
    ID - the ID for a TimeZone, such as "America/Los_Angeles", or a custom ID such as "GMT-8:00". Note that the support of abbreviations, such as "PST", is for JDK 1.1.x compatibility only and full names should be used.
    
    Returns:
    
    the specified TimeZone, or a mutable clone of the UNKNOWN_ZONE if the given ID cannot be understood or if the given ID is "Etc/Unknown".
    
    See Also:
    
    UNKNOWN_ZONE
    
    Status:
    Stable ICU 2.0.
  - getFrozenTimeZone
```
public static TimeZone getFrozenTimeZone(String ID)
```
    Gets the TimeZone for the given ID. The instance of TimeZone returned by this method is immutable. Any methods mutate the instance(setID(String), setRawOffset(int)) will throw UnsupportedOperationException upon its invocation.
    
    Parameters:
    
    ID - the ID for a TimeZone, such as "America/Los_Angeles", or a custom ID such as "GMT-8:00". Note that the support of abbreviations, such as "PST", is for JDK 1.1.x compatibility only and full names should be used.
    
    Returns:
    
    the specified TimeZone, or the UNKNOWN_ZONE if the given ID cannot be understood.
    
    See Also:
    
    UNKNOWN_ZONE
    
    Status:
    Stable ICU 49.
  - getTimeZone
```
public static TimeZone getTimeZone(String ID,
                                   int type)
```
    Gets the TimeZone for the given ID and the timezone type.
    
    Parameters:
    
    ID - the ID for a TimeZone, such as "America/Los_Angeles", or a custom ID such as "GMT-8:00". Note that the support of abbreviations, such as "PST", is for JDK 1.1.x compatibility only and full names should be used.
    
    type - Time zone type, either TIMEZONE_ICU or TIMEZONE_JDK.
    
    Returns:
    
    the specified TimeZone, or a mutable clone of the UNKNOWN_ZONE if the given ID cannot be understood or if the given ID is "Etc/Unknown".
    
    See Also:
    
    UNKNOWN_ZONE
    
    Status:
    Stable ICU 4.0.
  - setDefaultTimeZoneType
```
public static void setDefaultTimeZoneType(int type)
```
    Sets the default time zone type used by getTimeZone.
    
    Parameters:
    
    type - time zone type, either TIMEZONE_ICU or TIMEZONE_JDK.
    
    Status:
    Stable ICU 4.0.
  - getDefaultTimeZoneType
```
public static int getDefaultTimeZoneType()
```
    [icu] Returns the default time zone type currently used.
    
    Returns:
    
    The default time zone type, either TIMEZONE_ICU or TIMEZONE_JDK.
    
    Status:
    Stable ICU 4.0.
  - getAvailableIDs
```
public static Set<String> getAvailableIDs(TimeZone.SystemTimeZoneType zoneType,
                                          String region,
                                          Integer rawOffset)
```
    [icu] Returns a set of time zone ID strings with the given filter conditions.
    Note:A Set returned by this method is immutable.
    
    Parameters:
    
    zoneType - The system time zone type.
    
    region - The ISO 3166 two-letter country code or UN M.49 three-digit area code. When null, no filtering done by region.
    
    rawOffset - An offset from GMT in milliseconds, ignoring the effect of daylight savings time, if any. When null, no filtering done by zone offset.
    
    Returns:
    
    an immutable set of system time zone IDs.
    
    See Also:
    
    TimeZone.SystemTimeZoneType
    
    Status:
    Stable ICU 4.8.
  - getAvailableIDs
```
public static String[] getAvailableIDs(int rawOffset)
```
    Return a new String array containing all system TimeZone IDs with the given raw offset from GMT. These IDs may be passed to get() to construct the corresponding TimeZone object.
    
    Parameters:
    
    rawOffset - the offset in milliseconds from GMT
    
    Returns:
    
    an array of IDs for system TimeZones with the given raw offset. If there are none, return a zero-length array.
    
    See Also:
    
    getAvailableIDs(SystemTimeZoneType, String, Integer)
    
    Status:
    Stable ICU 2.0.
  - getAvailableIDs
```
public static String[] getAvailableIDs(String country)
```
    Return a new String array containing all system TimeZone IDs associated with the given country. These IDs may be passed to get() to construct the corresponding TimeZone object.
    
    Parameters:
    
    country - a two-letter ISO 3166 country code, or null to return zones not associated with any country
    
    Returns:
    
    an array of IDs for system TimeZones in the given country. If there are none, return a zero-length array.
    
    See Also:
    
    getAvailableIDs(SystemTimeZoneType, String, Integer)
    
    Status:
    Stable ICU 2.0.
  - getAvailableIDs
```
public static String[] getAvailableIDs()
```
    Return a new String array containing all system TimeZone IDs. These IDs (and only these IDs) may be passed to get() to construct the corresponding TimeZone object.
    
    Returns:
    
    an array of all system TimeZone IDs
    
    See Also:
    
    getAvailableIDs(SystemTimeZoneType, String, Integer)
    
    Status:
    Stable ICU 2.0.
  - countEquivalentIDs
```
public static int countEquivalentIDs(String id)
```
    [icu] Returns the number of IDs in the equivalency group that includes the given ID. An equivalency group contains zones that have the same GMT offset and rules.
    The returned count includes the given ID; it is always >= 1 for valid IDs. The given ID must be a system time zone. If it is not, returns zero.
    
    Parameters:
    
    id - a system time zone ID
    
    Returns:
    
    the number of zones in the equivalency group containing 'id', or zero if 'id' is not a valid system ID
    
    See Also:
    
    getEquivalentID(java.lang.String, int)
    
    Status:
    Stable ICU 2.0.
  - getEquivalentID
```
public static String getEquivalentID(String id,
                                     int index)
```
    Returns an ID in the equivalency group that includes the given ID. An equivalency group contains zones that have the same GMT offset and rules.
    The given index must be in the range 0..n-1, where n is the value returned by countEquivalentIDs(id). For some value of 'index', the returned value will be equal to the given id. If the given id is not a valid system time zone, or if 'index' is out of range, then returns an empty string.
    
    Parameters:
    
    id - a system time zone ID
    
    index - a value from 0 to n-1, where n is the value returned by countEquivalentIDs(id)
    
    Returns:
    
    the ID of the index-th zone in the equivalency group containing 'id', or an empty string if 'id' is not a valid system ID or 'index' is out of range
    
    See Also:
    
    countEquivalentIDs(java.lang.String)
    
    Status:
    Stable ICU 2.0.
  - forULocaleOrDefault
```
@Deprecated
public static TimeZone forULocaleOrDefault(ULocale locale)
```
    Deprecated. This API is ICU internal only.
    
    If the locale contains the timezone keyword, creates a copy of that TimeZone. Otherwise, create the default TimeZone.
    
    Parameters:
    
    locale - a locale which may contains 'timezone' keyword/value.
    
    Returns:
    
    A TimeZone. Clients are responsible for deleting the TimeZone object returned.
    
    Status:
    Internal. This API is ICU internal only.
  - forLocaleOrDefault
```
@Deprecated
public static TimeZone forLocaleOrDefault(Locale locale)
```
    Deprecated. This API is ICU internal only.
    
    If the locale contains the timezone keyword, creates a copy of that TimeZone. Otherwise, create the default TimeZone.
    
    Parameters:
    
    locale - a locale which may contains 'timezone' keyword/value.
    
    Returns:
    
    A TimeZone. Clients are responsible for deleting the TimeZone object returned.
    
    Status:
    Internal. This API is ICU internal only.
  - getDefault
```
public static TimeZone getDefault()
```
    Gets the default TimeZone for this host. The source of the default TimeZone may vary with implementation.
    
    Returns:
    
    a default TimeZone.
    
    Status:
    Stable ICU 2.0.
  - setDefault
```
public static void setDefault(TimeZone tz)
```
    Sets the TimeZone that is returned by the getDefault method. This method also sets a Java TimeZone equivalent to the input tz as the JVM's default time zone if not null. If tz is null, next getDefault() method invocation will reset the default time zone synchronized with the JVM's default at that time.
    
    Parameters:
    
    tz - the new default time zone
    
    Status:
    Stable ICU 2.0.
  - setICUDefault
```
@Deprecated
public static void setICUDefault(TimeZone tz)
```
    Deprecated. This API is ICU internal only.
    
    Sets the TimeZone that is returned by the getDefault method. If tz is null, next getDefault() method invocation will reset the default time zone synchronized with the JVM's default at that time. Unlike setDefault(TimeZone), this method does not change the JVM's default time zone.
    
    Parameters:
    
    tz - the new default time zone
    
    Status:
    Internal. This API is ICU internal only.
  - hasSameRules
```
public boolean hasSameRules(TimeZone other)
```
    Returns true if this zone has the same rule and offset as another zone. That is, if this zone differs only in ID, if at all. Returns false if the other zone is null.
    
    Parameters:
    
    other - the TimeZone object to be compared with
    
    Returns:
    
    true if the other zone is not null and is the same as this one, with the possible exception of the ID
    
    Status:
    Stable ICU 2.0.
  - clone
```
public Object clone()
```
    Overrides clone.
    
    Overrides:
    
    clone in class Object
    
    Status:
    Stable ICU 2.0.
  - equals
```
public boolean equals(Object obj)
```
    Overrides equals.
    
    Overrides:
    
    equals in class Object
    
    Returns:
    
    true if this object is the same as the obj argument; false otherwise.
    
    Status:
    Stable ICU 2.0.
  - hashCode
```
public int hashCode()
```
    Overrides hashCode.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    a hash code value for this object.
    
    Status:
    Stable ICU 2.0.
  - getTZDataVersion
```
public static String getTZDataVersion()
```
    [icu] Returns the time zone data version currently used by ICU.
    
    Returns:
    
    the version string, such as "2007f"
    
    Throws:
    
    MissingResourceException - if ICU time zone resource bundle is missing or the version information is not available.
    
    Status:
    Stable ICU 3.8.
  - getCanonicalID
```
public static String getCanonicalID(String id)
```
    [icu] Returns the canonical system time zone ID or the normalized custom time zone ID for the given time zone ID.
    
    Parameters:
    
    id - The input time zone ID to be canonicalized.
    
    Returns:
    
    The canonical system time zone ID or the custom time zone ID in normalized format for the given time zone ID. When the given time zone ID is neither a known system time zone ID nor a valid custom time zone ID, null is returned.
    
    Status:
    Stable ICU 4.0.
  - getCanonicalID
```
public static String getCanonicalID(String id,
                                    boolean[] isSystemID)
```
    [icu] Returns the canonical system time zone ID or the normalized custom time zone ID for the given time zone ID.
    
    Parameters:
    
    id - The input time zone ID to be canonicalized.
    
    isSystemID - When non-null boolean array is specified and the given ID is a known system time zone ID, true is set to isSystemID[0]
    
    Returns:
    
    The canonical system time zone ID or the custom time zone ID in normalized format for the given time zone ID. When the given time zone ID is neither a known system time zone ID nor a valid custom time zone ID, null is returned.
    
    Status:
    Stable ICU 4.0.
  - getIanaID
```
public static String getIanaID(String id)
```
    Returns the preferred time zone ID in the IANA database for the given time zone ID. There are two types of preferred IDs. The first type is the one defined in zone.tab file, such as "America/Los_Angeles". The second types is the one defined for zones not associated with a specific region, but not defined with "Link" syntax, such as "Etc/GMT+10".
    Note: For most of system time zone IDs, this method returns an ID same as getCanonicalID(String). getCanonicalID(String) is based on canonical time zone IDs defined in Unicode CLDR. These canonical time zone IDs in CLDR were based on very old version of the time zone database. In the IANA time zone database, some IDs were updated since then. This API returns a newer time zone ID. For example, CLDR defines "Asia/Calcutta" as the canonical time zone ID. This method returns "Asia/Kolkata" instead.
    "Etc/Unknown" is a special time zone ID defined by CLDR. There are no corresponding zones in the IANA time zone database. when the input is "Etc/Unknown", this method returns "Etc/Unknown", but it really means no mappings available. Caller of this method should interpret "Etc/Unknown" as an error.
    
    Parameters:
    
    id - The input time zone ID.
    
    Returns:
    
    The preferred time zone ID in the IANA time zone database, or UNKNOWN_ZONE_ID if the input ID is not a system ID.
    
    See Also:
    
    getCanonicalID(String)
    
    Status:
    Stable ICU 74.
  - getRegion
```
public static String getRegion(String id)
```
    [icu] Returns the region code associated with the given system time zone ID. The region code is either ISO 3166 2-letter country code or UN M.49 3-digit area code. When the time zone is not associated with a specific location, for example - "Etc/UTC", "EST5EDT", then this method returns "001" (UN M.49 area code for World).
    
    Parameters:
    
    id - the system time zone ID.
    
    Returns:
    
    the region code associated with the given system time zone ID.
    
    Throws:
    
    IllegalArgumentException - if id is not a known system ID.
    
    See Also:
    
    getAvailableIDs(String)
    
    Status:
    Stable ICU 4.8.
  - getWindowsID
```
public static String getWindowsID(String id)
```
    [icu] Converts a system time zone ID to an equivalent Windows time zone ID. For example, Windows time zone ID "Pacific Standard Time" is returned for input "America/Los_Angeles".
    There are system time zones that cannot be mapped to Windows zones. When the input system time zone ID is unknown or unmappable to a Windows time zone, then this method returns null.
    This implementation utilizes Zone-Tzid mapping data. The mapping data is updated time to time. To get the latest changes, please read the ICU user guide section Updating the Time Zone Data.
    
    Parameters:
    
    id - A system time zone ID
    
    Returns:
    
    A Windows time zone ID mapped from the input system time zone ID, or null when the input ID is unknown or unmappable.
    
    See Also:
    
    getIDForWindowsID(String, String)
    
    Status:
    Stable ICU 52.
  - getIDForWindowsID
```
public static String getIDForWindowsID(String winid,
                                       String region)
```
    [icu] Converts a Windows time zone ID to an equivalent system time zone ID for a region. For example, system time zone ID "America/Los_Angeles" is returned for input Windows ID "Pacific Standard Time" and region "US" (or null), "America/Vancouver" is returned for the same Windows ID "Pacific Standard Time" and region "CA".
    Not all Windows time zones can be mapped to system time zones. When the input Windows time zone ID is unknown or unmappable to a system time zone, then this method returns null.
    This implementation utilizes Zone-Tzid mapping data. The mapping data is updated time to time. To get the latest changes, please read the ICU user guide section Updating the Time Zone Data.
    
    Parameters:
    
    winid - A Windows time zone ID
    
    region - A region code, or null if no regional preference.
    
    Returns:
    
    A system time zone ID mapped from the input Windows time zone ID, or null when the input ID is unknown or unmappable.
    
    See Also:
    
    getWindowsID(String)
    
    Status:
    Stable ICU 52.
  - isFrozen
```
public boolean isFrozen()
```
    Determines whether the object has been frozen or not.
    
    Specified by:
    
    isFrozen in interface Freezable<TimeZone>
    
    Status:
    Stable ICU 49.
  - freeze
```
public TimeZone freeze()
```
    Freezes the object.
    
    Specified by:
    
    freeze in interface Freezable<TimeZone>
    
    Returns:
    
    the object itself.
    
    Status:
    Stable ICU 49.
  - cloneAsThawed
```
public TimeZone cloneAsThawed()
```
    Provides for the clone operation. Any clone is initially unfrozen.
    
    Specified by:
    
    cloneAsThawed in interface Freezable<TimeZone>
    
    Status:
    Stable ICU 49.

Class TimeZone

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

TIMEZONE_ICU

TIMEZONE_JDK

SHORT

LONG

SHORT_GENERIC

LONG_GENERIC

SHORT_GMT

LONG_GMT

SHORT_COMMONLY_USED

GENERIC_LOCATION

UNKNOWN_ZONE_ID

UNKNOWN_ZONE

GMT_ZONE

Constructor Detail

TimeZone

TimeZone

Method Detail

getOffset

getOffset

getOffset

setRawOffset

getRawOffset

getID

setID

getDisplayName

getDisplayName

getDisplayName

getDisplayName

getDisplayName

getDisplayName

getDSTSavings

useDaylightTime

observesDaylightTime

inDaylightTime

getTimeZone

getFrozenTimeZone

getTimeZone

setDefaultTimeZoneType

getDefaultTimeZoneType

getAvailableIDs

getAvailableIDs

getAvailableIDs

getAvailableIDs

countEquivalentIDs

getEquivalentID

forULocaleOrDefault

forLocaleOrDefault

getDefault

setDefault

setICUDefault

hasSameRules

clone

equals

hashCode

getTZDataVersion

getCanonicalID

getCanonicalID

getIanaID

getRegion

getWindowsID

getIDForWindowsID

isFrozen

freeze

cloneAsThawed