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SimpleTimeZone

public class SimpleTimeZone
extends TimeZone

java.lang.Object
   ↳ java.util.TimeZone
     ↳ java.util.SimpleTimeZone


SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar. The class holds an offset from GMT, called raw offset, and start and end rules for a daylight saving time schedule. Since it only holds single values for each, it cannot handle historical changes in the offset from GMT and the daylight saving schedule, except that the setStartYear method can specify the year when the daylight saving time schedule starts in effect.

To construct a SimpleTimeZone with a daylight saving time schedule, the schedule can be described with a set of rules, start-rule and end-rule. A day when daylight saving time starts or ends is specified by a combination of month, day-of-month, and day-of-week values. The month value is represented by a Calendar MONTH field value, such as MARCH. The day-of-week value is represented by a Calendar DAY_OF_WEEK value, such as SUNDAY. The meanings of value combinations are as follows.

  • Exact day of month
    To specify an exact day of month, set the month and day-of-month to an exact value, and day-of-week to zero. For example, to specify March 1, set the month to MARCH, day-of-month to 1, and day-of-week to 0.
  • Day of week on or after day of month
    To specify a day of week on or after an exact day of month, set the month to an exact month value, day-of-month to the day on or after which the rule is applied, and day-of-week to a negative DAY_OF_WEEK field value. For example, to specify the second Sunday of April, set month to APRIL, day-of-month to 8, and day-of-week to -SUNDAY.
  • Day of week on or before day of month
    To specify a day of the week on or before an exact day of the month, set day-of-month and day-of-week to a negative value. For example, to specify the last Wednesday on or before the 21st of March, set month to MARCH, day-of-month is -21 and day-of-week is -WEDNESDAY.
  • Last day-of-week of month
    To specify, the last day-of-week of the month, set day-of-week to a DAY_OF_WEEK value and day-of-month to -1. For example, to specify the last Sunday of October, set month to OCTOBER, day-of-week to SUNDAY and day-of-month to -1.
The time of the day at which daylight saving time starts or ends is specified by a millisecond value within the day. There are three kinds of modes to specify the time: WALL_TIME, STANDARD_TIME and UTC_TIME. For example, if daylight saving time ends at 2:00 am in the wall clock time, it can be specified by 7200000 milliseconds in the WALL_TIME mode. In this case, the wall clock time for an end-rule means the same thing as the daylight time.

The following are examples of parameters for constructing time zone objects.


      // Base GMT offset: -8:00
      // DST starts:      at 2:00am in standard time
      //                  on the first Sunday in April
      // DST ends:        at 2:00am in daylight time
      //                  on the last Sunday in October
      // Save:            1 hour
      SimpleTimeZone(-28800000,
                     "America/Los_Angeles",
                     Calendar.APRIL, 1, -Calendar.SUNDAY,
                     7200000,
                     Calendar.OCTOBER, -1, Calendar.SUNDAY,
                     7200000,
                     3600000)

      // Base GMT offset: +1:00
      // DST starts:      at 1:00am in UTC time
      //                  on the last Sunday in March
      // DST ends:        at 1:00am in UTC time
      //                  on the last Sunday in October
      // Save:            1 hour
      SimpleTimeZone(3600000,
                     "Europe/Paris",
                     Calendar.MARCH, -1, Calendar.SUNDAY,
                     3600000, SimpleTimeZone.UTC_TIME,
                     Calendar.OCTOBER, -1, Calendar.SUNDAY,
                     3600000, SimpleTimeZone.UTC_TIME,
                     3600000)
 
These parameter rules are also applicable to the set rule methods, such as setStartRule.

See also:

Summary

Constants

int STANDARD_TIME

Constant for a mode of start or end time specified as standard time.

int UTC_TIME

Constant for a mode of start or end time specified as UTC.

int WALL_TIME

Constant for a mode of start or end time specified as wall clock time.

Inherited constants

From class java.util.TimeZone

Public constructors

SimpleTimeZone(int rawOffset, String ID)

Constructs a SimpleTimeZone with the given base time zone offset from GMT and time zone ID with no daylight saving time schedule.

SimpleTimeZone(int rawOffset, String ID, int startMonth, int startDay, int startDayOfWeek, int startTime, int endMonth, int endDay, int endDayOfWeek, int endTime)

Constructs a SimpleTimeZone with the given base time zone offset from GMT, time zone ID, and rules for starting and ending the daylight time.

SimpleTimeZone(int rawOffset, String ID, int startMonth, int startDay, int startDayOfWeek, int startTime, int endMonth, int endDay, int endDayOfWeek, int endTime, int dstSavings)

Constructs a SimpleTimeZone with the given base time zone offset from GMT, time zone ID, and rules for starting and ending the daylight time.

SimpleTimeZone(int rawOffset, String ID, int startMonth, int startDay, int startDayOfWeek, int startTime, int startTimeMode, int endMonth, int endDay, int endDayOfWeek, int endTime, int endTimeMode, int dstSavings)

Constructs a SimpleTimeZone with the given base time zone offset from GMT, time zone ID, and rules for starting and ending the daylight time.

Public methods

Object clone()

Returns a clone of this SimpleTimeZone instance.

boolean equals(Object obj)

Compares the equality of two SimpleTimeZone objects.

int getDSTSavings()

Returns the amount of time in milliseconds that the clock is advanced during daylight saving time.

int getOffset(long date)

Returns the offset of this time zone from UTC at the given time.

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

Returns the difference in milliseconds between local time and UTC, taking into account both the raw offset and the effect of daylight saving, for the specified date and time.

int getRawOffset()

Gets the GMT offset for this time zone.

boolean hasSameRules(TimeZone other)

Returns true if this zone has the same rules and offset as another zone.

int hashCode()

Generates the hash code for the SimpleDateFormat object.

boolean inDaylightTime(Date date)

Queries if the given date is in daylight saving time.

boolean observesDaylightTime()

Returns true if this SimpleTimeZone observes Daylight Saving Time.

void setDSTSavings(int millisSavedDuringDST)

Sets the amount of time in milliseconds that the clock is advanced during daylight saving time.

void setEndRule(int endMonth, int endDay, int endDayOfWeek, int endTime, boolean after)

Sets the daylight saving time end rule to a weekday before or after the given date within a month, e.g., the first Monday on or after the 8th.

void setEndRule(int endMonth, int endDay, int endDayOfWeek, int endTime)

Sets the daylight saving time end rule.

void setEndRule(int endMonth, int endDay, int endTime)

Sets the daylight saving time end rule to a fixed date within a month.

void setRawOffset(int offsetMillis)

Sets the base time zone offset to GMT.

void setStartRule(int startMonth, int startDay, int startDayOfWeek, int startTime)

Sets the daylight saving time start rule.

void setStartRule(int startMonth, int startDay, int startTime)

Sets the daylight saving time start rule to a fixed date within a month.

void setStartRule(int startMonth, int startDay, int startDayOfWeek, int startTime, boolean after)

Sets the daylight saving time start rule to a weekday before or after the given date within a month, e.g., the first Monday on or after the 8th.

void setStartYear(int year)

Sets the daylight saving time starting year.

String toString()

Returns a string representation of this time zone.

boolean useDaylightTime()

Queries if this time zone uses daylight saving time.

Inherited methods

From class java.util.TimeZone
From class java.lang.Object

Constants

STANDARD_TIME

Added in API level 1
int STANDARD_TIME

Constant for a mode of start or end time specified as standard time.

Constant Value: 1 (0x00000001)

UTC_TIME

Added in API level 1
int UTC_TIME

Constant for a mode of start or end time specified as UTC. European Union rules are specified as UTC time, for example.

Constant Value: 2 (0x00000002)

WALL_TIME

Added in API level 1
int WALL_TIME

Constant for a mode of start or end time specified as wall clock time. Wall clock time is standard time for the onset rule, and daylight time for the end rule.

Constant Value: 0 (0x00000000)

Public constructors

SimpleTimeZone

Added in API level 1
SimpleTimeZone (int rawOffset, 
                String ID)

Constructs a SimpleTimeZone with the given base time zone offset from GMT and time zone ID with no daylight saving time schedule.

Parameters
rawOffset int: The base time zone offset in milliseconds to GMT.
ID String: The time zone name that is given to this instance.

SimpleTimeZone

Added in API level 1
SimpleTimeZone (int rawOffset, 
                String ID, 
                int startMonth, 
                int startDay, 
                int startDayOfWeek, 
                int startTime, 
                int endMonth, 
                int endDay, 
                int endDayOfWeek, 
                int endTime)

Constructs a SimpleTimeZone with the given base time zone offset from GMT, time zone ID, and rules for starting and ending the daylight time. Both startTime and endTime are specified to be represented in the wall clock time. The amount of daylight saving is assumed to be 3600000 milliseconds (i.e., one hour). This constructor is equivalent to:


     SimpleTimeZone(rawOffset,
                    ID,
                    startMonth,
                    startDay,
                    startDayOfWeek,
                    startTime,
                    SimpleTimeZone.WALL_TIME,
                    endMonth,
                    endDay,
                    endDayOfWeek,
                    endTime,
                    SimpleTimeZone.WALL_TIME,
                    3600000)
 

Parameters
rawOffset int: The given base time zone offset from GMT.
ID String: The time zone ID which is given to this object.
startMonth int: The daylight saving time starting month. Month is a MONTH field value (0-based. e.g., 0 for January).
startDay int: The day of the month on which the daylight saving time starts. See the class description for the special cases of this parameter.
startDayOfWeek int: The daylight saving time starting day-of-week. See the class description for the special cases of this parameter.
startTime int: The daylight saving time starting time in local wall clock time (in milliseconds within the day), which is local standard time in this case.
endMonth int: The daylight saving time ending month. Month is a MONTH field value (0-based. e.g., 9 for October).
endDay int: The day of the month on which the daylight saving time ends. See the class description for the special cases of this parameter.
endDayOfWeek int: The daylight saving time ending day-of-week. See the class description for the special cases of this parameter.
endTime int: The daylight saving ending time in local wall clock time, (in milliseconds within the day) which is local daylight time in this case.
Throws
IllegalArgumentException if the month, day, dayOfWeek, or time parameters are out of range for the start or end rule

SimpleTimeZone

Added in API level 1
SimpleTimeZone (int rawOffset, 
                String ID, 
                int startMonth, 
                int startDay, 
                int startDayOfWeek, 
                int startTime, 
                int endMonth, 
                int endDay, 
                int endDayOfWeek, 
                int endTime, 
                int dstSavings)

Constructs a SimpleTimeZone with the given base time zone offset from GMT, time zone ID, and rules for starting and ending the daylight time. Both startTime and endTime are assumed to be represented in the wall clock time. This constructor is equivalent to:


     SimpleTimeZone(rawOffset,
                    ID,
                    startMonth,
                    startDay,
                    startDayOfWeek,
                    startTime,
                    SimpleTimeZone.WALL_TIME,
                    endMonth,
                    endDay,
                    endDayOfWeek,
                    endTime,
                    SimpleTimeZone.WALL_TIME,
                    dstSavings)
 

Parameters
rawOffset int: The given base time zone offset from GMT.
ID String: The time zone ID which is given to this object.
startMonth int: The daylight saving time starting month. Month is a MONTH field value (0-based. e.g., 0 for January).
startDay int: The day of the month on which the daylight saving time starts. See the class description for the special cases of this parameter.
startDayOfWeek int: The daylight saving time starting day-of-week. See the class description for the special cases of this parameter.
startTime int: The daylight saving time starting time in local wall clock time, which is local standard time in this case.
endMonth int: The daylight saving time ending month. Month is a MONTH field value (0-based. e.g., 9 for October).
endDay int: The day of the month on which the daylight saving time ends. See the class description for the special cases of this parameter.
endDayOfWeek int: The daylight saving time ending day-of-week. See the class description for the special cases of this parameter.
endTime int: The daylight saving ending time in local wall clock time, which is local daylight time in this case.
dstSavings int: The amount of time in milliseconds saved during daylight saving time.
Throws
IllegalArgumentException if the month, day, dayOfWeek, or time parameters are out of range for the start or end rule

SimpleTimeZone

Added in API level 1
SimpleTimeZone (int rawOffset, 
                String ID, 
                int startMonth, 
                int startDay, 
                int startDayOfWeek, 
                int startTime, 
                int startTimeMode, 
                int endMonth, 
                int endDay, 
                int endDayOfWeek, 
                int endTime, 
                int endTimeMode, 
                int dstSavings)

Constructs a SimpleTimeZone with the given base time zone offset from GMT, time zone ID, and rules for starting and ending the daylight time. This constructor takes the full set of the start and end rules parameters, including modes of startTime and endTime. The mode specifies either wall time or standard time or UTC time.

Parameters
rawOffset int: The given base time zone offset from GMT.
ID String: The time zone ID which is given to this object.
startMonth int: The daylight saving time starting month. Month is a MONTH field value (0-based. e.g., 0 for January).
startDay int: The day of the month on which the daylight saving time starts. See the class description for the special cases of this parameter.
startDayOfWeek int: The daylight saving time starting day-of-week. See the class description for the special cases of this parameter.
startTime int: The daylight saving time starting time in the time mode specified by startTimeMode.
startTimeMode int: The mode of the start time specified by startTime.
endMonth int: The daylight saving time ending month. Month is a MONTH field value (0-based. e.g., 9 for October).
endDay int: The day of the month on which the daylight saving time ends. See the class description for the special cases of this parameter.
endDayOfWeek int: The daylight saving time ending day-of-week. See the class description for the special cases of this parameter.
endTime int: The daylight saving ending time in time time mode specified by endTimeMode.
endTimeMode int: The mode of the end time specified by endTime
dstSavings int: The amount of time in milliseconds saved during daylight saving time.
Throws
IllegalArgumentException if the month, day, dayOfWeek, time more, or time parameters are out of range for the start or end rule, or if a time mode value is invalid.

See also:

Public methods

clone

Added in API level 1
Object clone ()

Returns a clone of this SimpleTimeZone instance.

Returns
Object a clone of this instance.

equals

Added in API level 1
boolean equals (Object obj)

Compares the equality of two SimpleTimeZone objects.

Parameters
obj Object: The SimpleTimeZone object to be compared with.
Returns
boolean True if the given obj is the same as this SimpleTimeZone object; false otherwise.

getDSTSavings

Added in API level 1
int getDSTSavings ()

Returns the amount of time in milliseconds that the clock is advanced during daylight saving time.

Returns
int the number of milliseconds the time is advanced with respect to standard time when the daylight saving rules are in effect, or 0 (zero) if this time zone doesn't observe daylight saving time.

See also:

getOffset

Added in API level 1
int getOffset (long date)

Returns the offset of this time zone from UTC at the given time. If daylight saving time is in effect at the given time, the offset value is adjusted with the amount of daylight saving.

Parameters
date long: the time at which the time zone offset is found
Returns
int the amount of time in milliseconds to add to UTC to get local time.

getOffset

Added in API level 1
int getOffset (int era, 
                int year, 
                int month, 
                int day, 
                int dayOfWeek, 
                int millis)

Returns the difference in milliseconds between local time and UTC, taking into account both the raw offset and the effect of daylight saving, for the specified date and time. This method assumes that the start and end month are distinct. It also uses a default GregorianCalendar object as its underlying calendar, such as for determining leap years. Do not use the result of this method with a calendar other than a default GregorianCalendar.

Note: In general, clients should use Calendar.get(ZONE_OFFSET) + Calendar.get(DST_OFFSET) instead of calling this method.

Parameters
era int: The era of the given date.
year int: The year in the given date.
month int: The month in the given date. Month is 0-based. e.g., 0 for January.
day int: The day-in-month of the given date.
dayOfWeek int: The day-of-week of the given date.
millis int: The milliseconds in day in standard local time.
Returns
int The milliseconds to add to UTC to get local time.
Throws
IllegalArgumentException the era, month, day, dayOfWeek, or millis parameters are out of range

getRawOffset

Added in API level 1
int getRawOffset ()

Gets the GMT offset for this time zone.

Returns
int the GMT offset value in milliseconds

See also:

hasSameRules

Added in API level 1
boolean hasSameRules (TimeZone other)

Returns true if this zone has the same rules and offset as another zone.

Parameters
other TimeZone: the TimeZone object to be compared with
Returns
boolean true if the given zone is a SimpleTimeZone and has the same rules and offset as this one

hashCode

Added in API level 1
int hashCode ()

Generates the hash code for the SimpleDateFormat object.

Returns
int the hash code for this object

inDaylightTime

Added in API level 1
boolean inDaylightTime (Date date)

Queries if the given date is in daylight saving time.

Parameters
date Date: the given Date.
Returns
boolean true if daylight saving time is in effective at the given date; false otherwise.

observesDaylightTime

Added in API level 24
boolean observesDaylightTime ()

Returns true if this SimpleTimeZone observes Daylight Saving Time. This method is equivalent to useDaylightTime().

Returns
boolean true if this SimpleTimeZone observes Daylight Saving Time; false otherwise.

setDSTSavings

Added in API level 1
void setDSTSavings (int millisSavedDuringDST)

Sets the amount of time in milliseconds that the clock is advanced during daylight saving time.

Parameters
millisSavedDuringDST int: the number of milliseconds the time is advanced with respect to standard time when the daylight saving time rules are in effect. A positive number, typically one hour (3600000).

See also:

setEndRule

Added in API level 1
void setEndRule (int endMonth, 
                int endDay, 
                int endDayOfWeek, 
                int endTime, 
                boolean after)

Sets the daylight saving time end rule to a weekday before or after the given date within a month, e.g., the first Monday on or after the 8th.

Parameters
endMonth int: The daylight saving time ending month. Month is a MONTH field value (0-based. e.g., 9 for October).
endDay int: The day of the month on which the daylight saving time ends.
endDayOfWeek int: The daylight saving time ending day-of-week.
endTime int: The daylight saving ending time in local wall clock time, (in milliseconds within the day) which is local daylight time in this case.
after boolean: If true, this rule selects the first endDayOfWeek on or after endDay. If false, this rule selects the last endDayOfWeek on or before endDay of the month.
Throws
IllegalArgumentException the endMonth, endDay, endDayOfWeek, or endTime parameters are out of range

setEndRule

Added in API level 1
void setEndRule (int endMonth, 
                int endDay, 
                int endDayOfWeek, 
                int endTime)

Sets the daylight saving time end rule. For example, if daylight saving time ends on the last Sunday in October at 2 am in wall clock time, you can set the end rule by calling: setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2*60*60*1000);

Parameters
endMonth int: The daylight saving time ending month. Month is a MONTH field value (0-based. e.g., 9 for October).
endDay int: The day of the month on which the daylight saving time ends. See the class description for the special cases of this parameter.
endDayOfWeek int: The daylight saving time ending day-of-week. See the class description for the special cases of this parameter.
endTime int: The daylight saving ending time in local wall clock time, (in milliseconds within the day) which is local daylight time in this case.
Throws
IllegalArgumentException if the endMonth, endDay, endDayOfWeek, or endTime parameters are out of range

setEndRule

Added in API level 1
void setEndRule (int endMonth, 
                int endDay, 
                int endTime)

Sets the daylight saving time end rule to a fixed date within a month. This method is equivalent to:

setEndRule(endMonth, endDay, 0, endTime)

Parameters
endMonth int: The daylight saving time ending month. Month is a MONTH field value (0-based. e.g., 9 for October).
endDay int: The day of the month on which the daylight saving time ends.
endTime int: The daylight saving ending time in local wall clock time, (in milliseconds within the day) which is local daylight time in this case.
Throws
IllegalArgumentException the endMonth, endDay, or endTime parameters are out of range

setRawOffset

Added in API level 1
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 int: the given base time zone offset to GMT.

See also:

setStartRule

Added in API level 1
void setStartRule (int startMonth, 
                int startDay, 
                int startDayOfWeek, 
                int startTime)

Sets the daylight saving time start rule. For example, if daylight saving time starts on the first Sunday in April at 2 am in local wall clock time, you can set the start rule by calling:

setStartRule(Calendar.APRIL, 1, Calendar.SUNDAY, 2*60*60*1000);

Parameters
startMonth int: The daylight saving time starting month. Month is a MONTH field value (0-based. e.g., 0 for January).
startDay int: The day of the month on which the daylight saving time starts. See the class description for the special cases of this parameter.
startDayOfWeek int: The daylight saving time starting day-of-week. See the class description for the special cases of this parameter.
startTime int: The daylight saving time starting time in local wall clock time, which is local standard time in this case.
Throws
IllegalArgumentException if the startMonth, startDay, startDayOfWeek, or startTime parameters are out of range

setStartRule

Added in API level 1
void setStartRule (int startMonth, 
                int startDay, 
                int startTime)

Sets the daylight saving time start rule to a fixed date within a month. This method is equivalent to:

setStartRule(startMonth, startDay, 0, startTime)

Parameters
startMonth int: The daylight saving time starting month. Month is a MONTH field value (0-based. e.g., 0 for January).
startDay int: The day of the month on which the daylight saving time starts.
startTime int: The daylight saving time starting time in local wall clock time, which is local standard time in this case. See the class description for the special cases of this parameter.
Throws
IllegalArgumentException if the startMonth, startDayOfMonth, or startTime parameters are out of range

setStartRule

Added in API level 1
void setStartRule (int startMonth, 
                int startDay, 
                int startDayOfWeek, 
                int startTime, 
                boolean after)

Sets the daylight saving time start rule to a weekday before or after the given date within a month, e.g., the first Monday on or after the 8th.

Parameters
startMonth int: The daylight saving time starting month. Month is a MONTH field value (0-based. e.g., 0 for January).
startDay int: The day of the month on which the daylight saving time starts.
startDayOfWeek int: The daylight saving time starting day-of-week.
startTime int: The daylight saving time starting time in local wall clock time, which is local standard time in this case.
after boolean: If true, this rule selects the first dayOfWeek on or after dayOfMonth. If false, this rule selects the last dayOfWeek on or before dayOfMonth.
Throws
IllegalArgumentException if the startMonth, startDay, startDayOfWeek, or startTime parameters are out of range

setStartYear

Added in API level 1
void setStartYear (int year)

Sets the daylight saving time starting year.

Parameters
year int: The daylight saving starting year.

toString

Added in API level 1
String toString ()

Returns a string representation of this time zone.

Returns
String a string representation of this time zone.

useDaylightTime

Added in API level 1
boolean useDaylightTime ()

Queries if this time zone uses daylight saving time.

Returns
boolean true if this time zone uses daylight saving time; false otherwise.
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