Class SimpleTimeZone

All Implemented Interfaces:
Freezable<TimeZone>, Serializable, Cloneable

public class SimpleTimeZone extends BasicTimeZone
.

SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar. This class does not handle historical changes.

Use a negative value for dayOfWeekInMonth to indicate that SimpleTimeZone should count from the end of the month backwards. For example, if Daylight Savings Time starts or ends at the last Sunday in a month, use dayOfWeekInMonth = -1 along with dayOfWeek = Calendar.SUNDAY to specify the rule.

See Also:
  • Field Details

    • serialVersionUID

      private static final long serialVersionUID
      See Also:
    • WALL_TIME

      public static final int WALL_TIME
      Constant for a mode of start or end time specified as local wall time.
      See Also:
    • STANDARD_TIME

      public static final int STANDARD_TIME
      Constant for a mode of start or end time specified as local standard time.
      See Also:
    • UTC_TIME

      public static final int UTC_TIME
      Constant for a mode of start or end time specified as UTC.
      See Also:
    • staticMonthLength

      private static final byte[] staticMonthLength
    • DOM_MODE

      private static final int DOM_MODE
      See Also:
    • DOW_IN_MONTH_MODE

      private static final int DOW_IN_MONTH_MODE
      See Also:
    • DOW_GE_DOM_MODE

      private static final int DOW_GE_DOM_MODE
      See Also:
    • DOW_LE_DOM_MODE

      private static final int DOW_LE_DOM_MODE
      See Also:
    • raw

      private int raw
    • dst

      private int dst
    • xinfo

      private STZInfo xinfo
    • startMonth

      private int startMonth
    • startDay

      private int startDay
    • startDayOfWeek

      private int startDayOfWeek
    • startTime

      private int startTime
    • startTimeMode

      private int startTimeMode
    • endTimeMode

      private int endTimeMode
    • endMonth

      private int endMonth
    • endDay

      private int endDay
    • endDayOfWeek

      private int endDayOfWeek
    • endTime

      private int endTime
    • startYear

      private int startYear
    • useDaylight

      private boolean useDaylight
    • startMode

      private int startMode
    • endMode

      private int endMode
    • transitionRulesInitialized

      private transient boolean transitionRulesInitialized
    • initialRule

      private transient InitialTimeZoneRule initialRule
    • firstTransition

      private transient TimeZoneTransition firstTransition
    • stdRule

      private transient AnnualTimeZoneRule stdRule
    • dstRule

      private transient AnnualTimeZoneRule dstRule
    • isFrozen

      private transient volatile boolean isFrozen
  • Constructor Details

    • SimpleTimeZone

      public SimpleTimeZone(int rawOffset, String ID)
      Constructs a SimpleTimeZone with the given base time zone offset from GMT and time zone ID. Timezone IDs can be obtained from TimeZone.getAvailableIDs. Normally you should use TimeZone.getDefault to construct a TimeZone.
      Parameters:
      rawOffset - The given base time zone offset to GMT.
      ID - The time zone ID which is obtained from TimeZone.getAvailableIDs.
    • SimpleTimeZone

      public 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, time to start and end the daylight time. Timezone IDs can be obtained from TimeZone.getAvailableIDs. Normally you should use TimeZone.getDefault to create a TimeZone. For a time zone that does not use daylight saving time, do not use this constructor; instead you should use SimpleTimeZone(rawOffset, ID). By default, this constructor specifies day-of-week-in-month rules. That is, if the startDay is 1, and the startDayOfWeek is SUNDAY, then this indicates the first Sunday in the startMonth. A startDay of -1 likewise indicates the last Sunday. However, by using negative or zero values for certain parameters, other types of rules can be specified. Day of month. To specify an exact day of the month, such as March 1, set startDayOfWeek to zero. Day of week after day of month. To specify the first day of the week occurring on or after an exact day of the month, make the day of the week negative. For example, if startDay is 5 and startDayOfWeek is -MONDAY, this indicates the first Monday on or after the 5th day of the startMonth. Day of week before day of month. To specify the last day of the week occurring on or before an exact day of the month, make the day of the week and the day of the month negative. For example, if startDay is -21 and startDayOfWeek is -WEDNESDAY, this indicates the last Wednesday on or before the 21st of the startMonth. The above examples refer to the startMonth, startDay, and startDayOfWeek; the same applies for the endMonth, endDay, and endDayOfWeek.
      Parameters:
      rawOffset - The given base time zone offset to GMT.
      ID - The time zone ID which is obtained from TimeZone.getAvailableIDs.
      startMonth - The daylight savings starting month. Month is 0-based. eg, 0 for January.
      startDay - The daylight savings starting day-of-week-in-month. Please see the member description for an example.
      startDayOfWeek - The daylight savings starting day-of-week. Please see the member description for an example.
      startTime - The daylight savings starting time in local wall time, which is standard time in this case. Please see the member description for an example.
      endMonth - The daylight savings ending month. Month is 0-based. eg, 0 for January.
      endDay - The daylight savings ending day-of-week-in-month. Please see the member description for an example.
      endDayOfWeek - The daylight savings ending day-of-week. Please see the member description for an example.
      endTime - The daylight savings ending time in local wall time, which is daylight time in this case. Please see the member description for an example.
      Throws:
      IllegalArgumentException - the month, day, dayOfWeek, or time parameters are out of range for the start or end rule
    • SimpleTimeZone

      public 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, time and its mode to start and end the daylight time. The mode specifies either WALL_TIME or STANDARD_TIME or UTC_TIME.
      Parameters:
      rawOffset - The given base time zone offset to GMT.
      ID - The time zone ID which is obtained from TimeZone.getAvailableIDs.
      startMonth - The daylight savings starting month. Month is 0-based. eg, 0 for January.
      startDay - The daylight savings starting day-of-week-in-month. Please see the member description for an example.
      startDayOfWeek - The daylight savings starting day-of-week. Please see the member description for an example.
      startTime - The daylight savings starting time in local wall time, which is standard time in this case. Please see the member description for an example.
      startTimeMode - The mode of the start time specified by startTime.
      endMonth - The daylight savings ending month. Month is 0-based. eg, 0 for January.
      endDay - The daylight savings ending day-of-week-in-month. Please see the member description for an example.
      endDayOfWeek - The daylight savings ending day-of-week. Please see the member description for an example.
      endTime - The daylight savings ending time in local wall time, which is daylight time in this case. Please see the member description for an example.
      endTimeMode - The mode of the end time specified by endTime.
      dstSavings - The amount of time in ms saved during DST.
      Throws:
      IllegalArgumentException - the month, day, dayOfWeek, or time parameters are out of range for the start or end rule
    • SimpleTimeZone

      public SimpleTimeZone(int rawOffset, String ID, int startMonth, int startDay, int startDayOfWeek, int startTime, int endMonth, int endDay, int endDayOfWeek, int endTime, int dstSavings)
      Constructor. This constructor is identical to the 10-argument constructor, but also takes a dstSavings parameter.
      Parameters:
      rawOffset - The given base time zone offset to GMT.
      ID - The time zone ID which is obtained from TimeZone.getAvailableIDs.
      startMonth - The daylight savings starting month. Month is 0-based. eg, 0 for January.
      startDay - The daylight savings starting day-of-week-in-month. Please see the member description for an example.
      startDayOfWeek - The daylight savings starting day-of-week. Please see the member description for an example.
      startTime - The daylight savings starting time in local wall time, which is standard time in this case. Please see the member description for an example.
      endMonth - The daylight savings ending month. Month is 0-based. eg, 0 for January.
      endDay - The daylight savings ending day-of-week-in-month. Please see the member description for an example.
      endDayOfWeek - The daylight savings ending day-of-week. Please see the member description for an example.
      endTime - The daylight savings ending time in local wall time, which is daylight time in this case. Please see the member description for an example.
      dstSavings - The amount of time in ms saved during DST.
      Throws:
      IllegalArgumentException - the month, day, dayOfWeek, or time parameters are out of range for the start or end rule
  • Method Details

    • setID

      public void setID(String ID)
      Sets the time zone ID. This does not change any other data in the time zone object.
      Overrides:
      setID in class TimeZone
      Parameters:
      ID - the new time zone ID.
    • setRawOffset

      public void setRawOffset(int offsetMillis)
      Overrides TimeZone Sets the base time zone offset to GMT. This is the offset to add "to" UTC to get local time.
      Specified by:
      setRawOffset in class TimeZone
      Parameters:
      offsetMillis - the raw offset of the time zone
    • getRawOffset

      public int getRawOffset()
      Overrides TimeZone Gets the GMT offset for this time zone.
      Specified by:
      getRawOffset in class TimeZone
      Returns:
      the raw offset
    • setStartYear

      public void setStartYear(int year)
      Sets the daylight savings starting year.
      Parameters:
      year - The daylight savings starting year.
    • setStartRule

      public void setStartRule(int month, int dayOfWeekInMonth, int dayOfWeek, int time)
      Sets the daylight savings starting rule. For example, Daylight Savings Time starts at the second Sunday in March, at 2 AM in standard time. Therefore, you can set the start rule by calling: setStartRule(Calendar.MARCH, 2, Calendar.SUNDAY, 2*60*60*1000);
      Parameters:
      month - The daylight savings starting month. Month is 0-based. eg, 0 for January.
      dayOfWeekInMonth - The daylight savings starting day-of-week-in-month. Please see the member description for an example.
      dayOfWeek - The daylight savings starting day-of-week. Please see the member description for an example.
      time - The daylight savings starting time in local wall time, which is standard time in this case. Please see the member description for an example.
      Throws:
      IllegalArgumentException - the month, dayOfWeekInMonth, dayOfWeek, or time parameters are out of range
    • setStartRule

      private void setStartRule(int month, int dayOfWeekInMonth, int dayOfWeek, int time, int mode)
      Sets the daylight savings starting rule. For example, in the U.S., Daylight Savings Time starts at the second Sunday in March, at 2 AM in standard time. Therefore, you can set the start rule by calling: setStartRule(Calendar.MARCH, 2, Calendar.SUNDAY, 2*60*60*1000); The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate the exact starting date. Their exact meaning depend on their respective signs, allowing various types of rules to be constructed, as follows:
      • If both dayOfWeekInMonth and dayOfWeek are positive, they specify the day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday of the month).
      • If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify the day of week in the month counting backward from the end of the month. (e.g., (-1, MONDAY) is the last Monday in the month)
      • If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth specifies the day of the month, regardless of what day of the week it is. (e.g., (10, 0) is the tenth day of the month)
      • If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth specifies the day of the month counting backward from the end of the month, regardless of what day of the week it is (e.g., (-2, 0) is the next-to-last day of the month).
      • If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the first specified day of the week on or after the specified day of the month. (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month [or the 15th itself if the 15th is a Sunday].)
      • If dayOfWeek and DayOfWeekInMonth are both negative, they specify the last specified day of the week on or before the specified day of the month. (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month [or the 20th itself if the 20th is a Tuesday].)
      Parameters:
      month - the daylight savings starting month. Month is 0-based. eg, 0 for January.
      dayOfWeekInMonth - the daylight savings starting day-of-week-in-month. Please see the member description for an example.
      dayOfWeek - the daylight savings starting day-of-week. Please see the member description for an example.
      time - the daylight savings starting time. Please see the member description for an example.
    • setStartRule

      public void setStartRule(int month, int dayOfMonth, int time)
      Sets the DST start rule to a fixed date within a month.
      Parameters:
      month - The month in which this rule occurs (0-based).
      dayOfMonth - The date in that month (1-based).
      time - The time of that day (number of millis after midnight) when DST takes effect in local wall time, which is standard time in this case.
      Throws:
      IllegalArgumentException - the month, dayOfMonth, or time parameters are out of range
    • setStartRule

      public void setStartRule(int month, int dayOfMonth, int dayOfWeek, int time, boolean after)
      Sets the DST start rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.
      Parameters:
      month - The month in which this rule occurs (0-based).
      dayOfMonth - A date within that month (1-based).
      dayOfWeek - The day of the week on which this rule occurs.
      time - The time of that day (number of millis after midnight) when DST takes effect in local wall time, which is standard time in this case.
      after - 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 - the month, dayOfMonth, dayOfWeek, or time parameters are out of range
    • setEndRule

      public void setEndRule(int month, int dayOfWeekInMonth, int dayOfWeek, int time)
      Sets the daylight savings ending rule. For example, if Daylight Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time, you can set the end rule by calling: setEndRule(Calendar.OCTOBER, -1, Calendar.SUNDAY, 2*60*60*1000);
      Parameters:
      month - The daylight savings ending month. Month is 0-based. eg, 0 for January.
      dayOfWeekInMonth - The daylight savings ending day-of-week-in-month. Please see the member description for an example.
      dayOfWeek - The daylight savings ending day-of-week. Please see the member description for an example.
      time - The daylight savings ending time in local wall time, which is daylight time in this case. Please see the member description for an example.
      Throws:
      IllegalArgumentException - the month, dayOfWeekInMonth, dayOfWeek, or time parameters are out of range
    • setEndRule

      public void setEndRule(int month, int dayOfMonth, int time)
      Sets the DST end rule to a fixed date within a month.
      Parameters:
      month - The month in which this rule occurs (0-based).
      dayOfMonth - The date in that month (1-based).
      time - The time of that day (number of millis after midnight) when DST ends in local wall time, which is daylight time in this case.
      Throws:
      IllegalArgumentException - the month, dayOfMonth, or time parameters are out of range
    • setEndRule

      public void setEndRule(int month, int dayOfMonth, int dayOfWeek, int time, boolean after)
      Sets the DST end rule to a weekday before or after a give date within a month, e.g., the first Monday on or after the 8th.
      Parameters:
      month - The month in which this rule occurs (0-based).
      dayOfMonth - A date within that month (1-based).
      dayOfWeek - The day of the week on which this rule occurs.
      time - The time of that day (number of millis after midnight) when DST ends in local wall time, which is daylight time in this case.
      after - 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 - the month, dayOfMonth, dayOfWeek, or time parameters are out of range
    • setEndRule

      private void setEndRule(int month, int dayOfMonth, int dayOfWeek, int time, int mode, boolean after)
    • setEndRule

      private void setEndRule(int month, int dayOfWeekInMonth, int dayOfWeek, int time, int mode)
      Sets the daylight savings ending rule. For example, in the U.S., Daylight Savings Time ends at the first Sunday in November, at 2 AM in standard time. Therefore, you can set the end rule by calling: setEndRule(Calendar.NOVEMBER, 1, Calendar.SUNDAY, 2*60*60*1000); Various other types of rules can be specified by manipulating the dayOfWeek and dayOfWeekInMonth parameters. For complete details, see the documentation for setStartRule().
      Parameters:
      month - the daylight savings ending month. Month is 0-based. eg, 0 for January.
      dayOfWeekInMonth - the daylight savings ending day-of-week-in-month. See setStartRule() for a complete explanation.
      dayOfWeek - the daylight savings ending day-of-week. See setStartRule() for a complete explanation.
      time - the daylight savings ending time. Please see the member description for an example.
    • setDSTSavings

      public void setDSTSavings(int millisSavedDuringDST)
      Sets the amount of time in ms that the clock is advanced during DST.
      Parameters:
      millisSavedDuringDST - the number of milliseconds the time is advanced with respect to standard time when the daylight savings rules are in effect. Typically one hour (+3600000). The amount could be negative, but not 0.
    • getDSTSavings

      public int getDSTSavings()
      Returns the amount of time in ms that the clock is advanced during DST.
      Overrides:
      getDSTSavings in class TimeZone
      Returns:
      the number of milliseconds the time is advanced with respect to standard time when the daylight savings rules are in effect. Typically one hour (3600000). The amount could be negative, but not 0.
    • readObject

      private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
      Returns the java.util.SimpleTimeZone that this class wraps. java.util.SimpleTimeZone unwrapSTZ() { return (java.util.SimpleTimeZone) unwrap(); }
      Throws:
      IOException
      ClassNotFoundException
    • toString

      public String toString()
      Returns a string representation of this object.
      Overrides:
      toString in class Object
      Returns:
      a string representation of this object
    • getSTZInfo

      private STZInfo getSTZInfo()
    • getOffset

      public int getOffset(int era, int year, int month, int day, int dayOfWeek, int millis)
      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.
      Specified by:
      getOffset in class TimeZone
      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.
      millis - the millis in day in standard local time.
      Returns:
      the offset to add to GMT to get local time.
    • getOffset

      @Deprecated public int getOffset(int era, int year, int month, int day, int dayOfWeek, int millis, int monthLength)
      Deprecated.
      This API is ICU internal only.
    • getOffset

      private int getOffset(int era, int year, int month, int day, int dayOfWeek, int millis, int monthLength, int prevMonthLength)
    • getOffsetFromLocal

      public void getOffsetFromLocal(long date, BasicTimeZone.LocalOption nonExistingTimeOpt, BasicTimeZone.LocalOption duplicatedTimeOpt, int[] offsets)
      Returns time zone offsets from local wall time.
      Overrides:
      getOffsetFromLocal in class BasicTimeZone
    • compareToRule

      private int compareToRule(int month, int monthLen, int prevMonthLen, int dayOfMonth, int dayOfWeek, int millis, int millisDelta, int ruleMode, int ruleMonth, int ruleDayOfWeek, int ruleDay, int ruleMillis)
      Compare a given date in the year to a rule. Return 1, 0, or -1, depending on whether the date is after, equal to, or before the rule date. The millis are compared directly against the ruleMillis, so any standard-daylight adjustments must be handled by the caller.
      Returns:
      1 if the date is after the rule date, -1 if the date is before the rule date, or 0 if the date is equal to the rule date.
    • useDaylightTime

      public boolean useDaylightTime()
      Overrides TimeZone Queries if this time zone uses Daylight Saving Time.
      Specified by:
      useDaylightTime in class TimeZone
      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.

    • 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 TimeZone.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, TimeZone.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 TimeZone.useDaylightTime(), the implementation does not take past daylight saving time into account, so that this method may return false even when TimeZone.useDaylightTime() returns true.

      Overrides:
      observesDaylightTime in class TimeZone
      Returns:
      true if this time zone is in daylight saving time or will observe daylight saving time at any future time.
      See Also:
    • inDaylightTime

      public boolean inDaylightTime(Date date)
      Overrides TimeZone Queries if the give date is in Daylight Saving Time.
      Specified by:
      inDaylightTime in class TimeZone
      Parameters:
      date - the given Date.
      Returns:
      true if the given date is in daylight savings time, false, otherwise.
    • construct

      private void construct(int _raw, int _startMonth, int _startDay, int _startDayOfWeek, int _startTime, int _startTimeMode, int _endMonth, int _endDay, int _endDayOfWeek, int _endTime, int _endTimeMode, int _dst)
      Internal construction method.
    • decodeRules

      private void decodeRules()
    • decodeStartRule

      private void decodeStartRule()
      Decode the start rule and validate the parameters. The parameters are expected to be in encoded form, which represents the various rule modes by negating or zeroing certain values. Representation formats are:

                  DOW_IN_MONTH  DOM    DOW>=DOM  DOW<=DOM  no DST
                  ------------  -----  --------  --------  ----------
       month       0..11        same    same      same     don't care
       day        -5..5         1..31   1..31    -1..-31   0
       dayOfWeek   1..7         0      -1..-7    -1..-7    don't care
       time        0..ONEDAY    same    same      same     don't care
       
      The range for month does not include UNDECIMBER since this class is really specific to GregorianCalendar, which does not use that month. The range for time includes ONEDAY (vs. ending at ONEDAY-1) because the end rule is an exclusive limit point. That is, the range of times that are in DST include those >= the start and < the end. For this reason, it should be possible to specify an end of ONEDAY in order to include the entire day. Although this is equivalent to time 0 of the following day, it's not always possible to specify that, for example, on December 31. While arguably the start range should still be 0..ONEDAY-1, we keep the start and end ranges the same for consistency.
    • decodeEndRule

      private void decodeEndRule()
      Decode the end rule and validate the parameters. This method is exactly analogous to decodeStartRule().
      See Also:
    • equals

      public boolean equals(Object obj)
      Overrides equals.
      Overrides:
      equals in class TimeZone
      Returns:
      true if obj is a SimpleTimeZone equivalent to this
    • idEquals

      private boolean idEquals(String id1, String id2)
    • hashCode

      public int hashCode()
      Overrides hashCode.
      Overrides:
      hashCode in class TimeZone
      Returns:
      a hash code value for this object.
    • clone

      public Object clone()
      Overrides clone.
      Overrides:
      clone in class TimeZone
    • hasSameRules

      public boolean hasSameRules(TimeZone othr)
      Returns true if this zone has the same rules and offset as another zone.
      Overrides:
      hasSameRules in class TimeZone
      Parameters:
      othr - the TimeZone object to be compared with
      Returns:
      true if the given zone has the same rules and offset as this one
    • getNextTransition

      public TimeZoneTransition getNextTransition(long base, boolean inclusive)
      Returns the first time zone transition after the base time.

      Example code:{@.jcite com.ibm.icu.samples.util.timezone.BasicTimeZoneExample:---getNextTransitionExample}

      Specified by:
      getNextTransition in class BasicTimeZone
      Parameters:
      base - The base time.
      inclusive - Whether the base time is inclusive or not.
      Returns:
      A Date holding the first time zone transition time after the given base time, or null if no time zone transitions are available after the base time.
    • getPreviousTransition

      public TimeZoneTransition getPreviousTransition(long base, boolean inclusive)
      Returns the last time zone transition before the base time.

      Example code:{@.jcite com.ibm.icu.samples.util.timezone.BasicTimeZoneExample:---getPreviousTransitionExample}

      Specified by:
      getPreviousTransition in class BasicTimeZone
      Parameters:
      base - The base time.
      inclusive - Whether the base time is inclusive or not.
      Returns:
      A Date holding the last time zone transition time before the given base time, or null if no time zone transitions are available before the base time.
    • getTimeZoneRules

      public TimeZoneRule[] getTimeZoneRules()
      Returns the array of TimeZoneRule which represents the rule of this time zone object. The first element in the result array will be the InitialTimeZoneRule instance for the initial rule. The rest will be either AnnualTimeZoneRule or TimeArrayTimeZoneRule instances representing transitions.
      Specified by:
      getTimeZoneRules in class BasicTimeZone
      Returns:
      The array of TimeZoneRule which represents this time zone.
    • initTransitionRules

      private void initTransitionRules()
    • isFrozen

      public boolean isFrozen()
      Determines whether the object has been frozen or not.
      Specified by:
      isFrozen in interface Freezable<TimeZone>
      Overrides:
      isFrozen in class TimeZone
    • freeze

      public TimeZone freeze()
      Freezes the object.
      Specified by:
      freeze in interface Freezable<TimeZone>
      Overrides:
      freeze in class TimeZone
      Returns:
      the object itself.
    • cloneAsThawed

      public TimeZone cloneAsThawed()
      Provides for the clone operation. Any clone is initially unfrozen.
      Specified by:
      cloneAsThawed in interface Freezable<TimeZone>
      Overrides:
      cloneAsThawed in class TimeZone