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java.lang.Objectcom.ibm.icu.util.TimeZone
public abstract class TimeZone
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
U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a
U.S. Pacific Time TimeZone
object with:
You can useTimeZone tz = TimeZone.getTimeZone("America/Los_Angeles");
getAvailableIDs
method to iterate through
all the supported time zone IDs. 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:
For example, you might specify GMT+14:00 as a custom time zone ID. TheGMT[+|-]hh[[:]mm]
TimeZone
that is returned
when you specify a custom time zone ID does not include
daylight savings time.
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 TimeZone
class is loaded, the intialization 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 setDefaultTimeZoneType
at runtime.
Calendar
,
GregorianCalendar
,
SimpleTimeZone
,
Serialized FormField Summary | |
---|---|
static int |
LONG
A style specifier for getDisplayName() indicating
a long name, such as "Pacific Standard Time." |
static int |
SHORT
A style specifier for getDisplayName() indicating
a short name, such as "PST." |
static int |
TIMEZONE_ICU
A time zone implementation type indicating ICU's own TimeZone used by getTimeZone , setDefaultTimeZoneType
and getDefaultTimeZoneType . |
static int |
TIMEZONE_JDK
A time zone implementation type indicating JDK TimeZone used by getTimeZone , setDefaultTimeZoneType
and getDefaultTimeZoneType . |
Constructor Summary | |
---|---|
TimeZone()
Default constructor. |
Method Summary | |
---|---|
Object |
clone()
Overrides Cloneable |
static int |
countEquivalentIDs(String id)
Returns the number of IDs in the equivalency group that includes the given ID. |
boolean |
equals(Object obj)
Return true if obj is a TimeZone with the same class and ID as this. |
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 String |
getCanonicalID(String id)
Returns the canonical system timezone ID or the normalized custom time zone ID for the given time zone ID. |
static String |
getCanonicalID(String id,
boolean[] isSystemID)
Returns the canonical system timezone 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()
Returns the default timezone type currently used. |
String |
getDisplayName()
Returns a name of this time zone suitable for presentation to the user in the default locale. |
String |
getDisplayName(boolean daylight,
int style)
Returns a name of this time zone suitable for presentation to the user in the default 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. |
String |
getID()
Gets the ID of this time zone. |
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 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()
Returns the timezone data version currently used by ICU. |
int |
hashCode()
Return the hash code. |
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. |
static void |
setDefault(TimeZone tz)
Sets the TimeZone that is
returned by the getDefault method. |
static void |
setDefaultTimeZoneType(int type)
Sets the default timezone type used by getTimeZone . |
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 |
---|
public static final int TIMEZONE_ICU
getTimeZone
, setDefaultTimeZoneType
and getDefaultTimeZoneType
.
public static final int TIMEZONE_JDK
getTimeZone
, setDefaultTimeZoneType
and getDefaultTimeZoneType
.
public static final int SHORT
getDisplayName()
indicating
a short name, such as "PST."
LONG
,
Constant Field Valuespublic static final int LONG
getDisplayName()
indicating
a long name, such as "Pacific Standard Time."
SHORT
,
Constant Field ValuesConstructor Detail |
---|
public TimeZone()
Method Detail |
---|
public abstract int getOffset(int era, int year, int month, int day, int dayOfWeek, int milliseconds)
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.
public int getOffset(long date)
date
- the date represented in milliseconds since January 1, 1970 00:00:00 GMT
Calendar.ZONE_OFFSET
,
Calendar.DST_OFFSET
,
getOffset(long, boolean, int[])
public void getOffset(long date, boolean local, int[] offsets)
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.public abstract void setRawOffset(int offsetMillis)
offsetMillis
- the given base time zone offset to GMT.public abstract int getRawOffset()
public String getID()
public void setID(String ID)
ID
- the new time zone ID.public final String getDisplayName()
public final String getDisplayName(Locale locale)
locale
- the locale in which to supply the display name.
public final String getDisplayName(ULocale locale)
locale
- the ulocale in which to supply the display name.
public final String getDisplayName(boolean daylight, int style)
GMT[+-]hh:mm
.
daylight
- if true, return the daylight savings name.style
- either LONG
or SHORT
public String getDisplayName(boolean daylight, int style, Locale locale)
GMT[+-]hh:mm
.
daylight
- if true, return the daylight savings name.style
- either LONG
or SHORT
locale
- the locale in which to supply the display name.
IllegalArgumentException
- style is invalid.public String getDisplayName(boolean daylight, int style, ULocale locale)
GMT[+-]hh:mm
.
daylight
- if true, return the daylight savings name.style
- either LONG
or SHORT
locale
- the locale in which to supply the display name.
IllegalArgumentException
- style is invalid.public int getDSTSavings()
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.
public abstract boolean useDaylightTime()
public abstract boolean inDaylightTime(Date date)
date
- the given Date.
public static TimeZone getTimeZone(String ID)
TimeZone
for the given ID.
ID
- the ID for a TimeZone
, either an abbreviation
such as "PST", a full name such as "America/Los_Angeles", or a custom
ID such as "GMT-8:00". Note that the support of abbreviations is
for JDK 1.1.x compatibility only and full names should be used.
TimeZone
, or the GMT zone if the given ID
cannot be understood.public static TimeZone getTimeZone(String ID, int type)
TimeZone
for the given ID and the timezone type.
ID
- the ID for a TimeZone
, either an abbreviation
such as "PST", a full name such as "America/Los_Angeles", or a custom
ID such as "GMT-8:00". Note that the support of abbreviations is
for JDK 1.1.x compatibility only and full names should be used.type
- Timezone type, either TIMEZONE_ICU
or TIMEZONE_JDK
.
TimeZone
, or the GMT zone if the given ID
cannot be understood.public static void setDefaultTimeZoneType(int type)
getTimeZone
.
type
- Timezone type, either TIMEZONE_ICU
or TIMEZONE_JDK
.public static int getDefaultTimeZoneType()
TIMEZONE_ICU
or TIMEZONE_JDK
.public static String[] getAvailableIDs(int rawOffset)
get()
to construct the corresponding TimeZone
object.
rawOffset
- the offset in milliseconds from GMT
public static String[] getAvailableIDs(String country)
get()
to construct the corresponding TimeZone
object.
country
- a two-letter ISO 3166 country code, or null
to return zones not associated with any country
public static String[] getAvailableIDs()
get()
to construct the corresponding TimeZone
object.
public static int countEquivalentIDs(String id)
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.
id
- a system time zone ID
getEquivalentID(java.lang.String, int)
public static String getEquivalentID(String id, int index)
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.
id
- a system time zone IDindex
- a value from 0 to n-1, where n is the value
returned by countEquivalentIDs(id)
countEquivalentIDs(java.lang.String)
public static TimeZone getDefault()
TimeZone
for this host.
The source of the default TimeZone
may vary with implementation.
TimeZone
.public static void setDefault(TimeZone tz)
TimeZone
that is
returned by the getDefault
method. If zone
is null, reset the default to the value it had originally when the
VM first started.
tz
- the new default time zonepublic boolean hasSameRules(TimeZone other)
other
- the TimeZone
object to be compared with
public Object clone()
clone
in class Object
public boolean equals(Object obj)
equals
in class Object
obj
- the object to compare against
public int hashCode()
hashCode
in class Object
public static String getTZDataVersion()
MissingResourceException
- if ICU timezone resource bundle
is missing or the version information is not available.public static String getCanonicalID(String id)
id
- The input timezone ID to be canonicalized.
public static String getCanonicalID(String id, boolean[] isSystemID)
id
- The input timezone ID to be canonicalized.isSystemID
- When non-null boolean array is specified and
the given ID is a known system timezone ID, true is set to isSystemID[0]
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