java.util
Class SimpleTimeZone

java.lang.Object
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  +--java.util.TimeZone
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        +--java.util.SimpleTimeZone

public class SimpleTimeZone

extends TimeZone

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, Daylight Savings Time ends at the last (dayOfWeekInMonth = -1) Sunday in October, at 2 AM in standard time.

See Also:

Calendar, GregorianCalendar, TimeZone, Serialized Form

Fields inherited from class java.util.TimeZone

LONG, SHORT

Constructor Summary

SimpleTimeZone(int rawOffset, String ID)
Constructs a SimpleTimeZone with the given base time zone offset from GMT and time zone ID.

SimpleTimeZone(int rawOffset, String ID, int startMonth, int startDay, int startDayOfWeek, int startTime, int endMonth, int endDay, int endDayOfWeek, int endTime)
Construct a SimpleTimeZone with the given base time zone offset from GMT, time zone ID, time to start and end 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)
Constructor.

Method Summary

Object	clone() Overrides Cloneable
boolean	equals(Object obj) Compares the equality of two SimpleTimeZone objects.
int	getDSTSavings() Returns the amount of time in ms that the clock is advanced during DST.
int	getOffset(int era, int year, int month, int day, int dayOfWeek, int millis) Overrides TimeZone Gets offset, for current date, modified in case of daylight savings.
int	getRawOffset() Overrides TimeZone Gets the GMT offset for this time zone.
int	hashCode() Override hashCode.
boolean	hasSameRules(TimeZone other) Return true if this zone has the same rules and offset as another zone.
boolean	inDaylightTime(Date date) Overrides TimeZone Queries if the given date is in Daylight Savings Time.
void	setDSTSavings(int millisSavedDuringDST) Sets the amount of time in ms that the clock is advanced during DST.
void	setEndRule(int month, int dayOfMonth, int time) Sets the DST end rule to a fixed date within a month.
void	setEndRule(int month, int dayOfWeekInMonth, int dayOfWeek, int time) Sets the daylight savings ending rule.
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.
void	setRawOffset(int offsetMillis) Overrides TimeZone Sets the base time zone offset to GMT.
void	setStartRule(int month, int dayOfMonth, int time) Sets the DST start rule to a fixed date within a month.
void	setStartRule(int month, int dayOfWeekInMonth, int dayOfWeek, int time) Sets the daylight savings starting rule.
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.
void	setStartYear(int year) Sets the daylight savings starting year.
String	toString() Return a string representation of this time zone.
boolean	useDaylightTime() Overrides TimeZone Queries if this time zone uses Daylight Savings Time.

Methods inherited from class java.util.TimeZone

getAvailableIDs, getAvailableIDs, getDefault, getDisplayName, getDisplayName, getDisplayName, getDisplayName, getID, getTimeZone, setDefault, setID

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

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)

Construct 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 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:

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 Detail

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 first Sunday in April, at 2 AM in standard time. Therefore, you can set the start rule by calling: setStartRule(TimeFields.APRIL, 1, TimeFields.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

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, Daylight Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time. Therefore, you can set the end rule by calling: setEndRule(TimeFields.OCTOBER, -1, TimeFields.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

getOffset

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

Overrides TimeZone Gets offset, for current date, modified in case of daylight savings. This is the offset to add *to* UTC to get local time. 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. Assume that the start and end month are distinct. This method may return incorrect results for rules that start at the end of February (e.g., last Sunday in February) or the beginning of March (e.g., March 1). To avoid such inaccuracies, use Calendar.get(ZONE_OFFSET) + Calendar.get(DST_OFFSET) instead.

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 milliseconds in day in standard local time.

Returns:

The offset to add *to* GMT to get local time.

Throws:

IllegalArgumentException - the era, month, day, dayOfWeek, or millis parameters are out of range

Overrides:

getOffset in class TimeZone

getRawOffset

public int getRawOffset()

Overrides TimeZone Gets the GMT offset for this time zone.

Overrides:

getRawOffset in class TimeZone

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. Please see TimeZone.setRawOffset for descriptions on the parameter.

Overrides:

setRawOffset in class TimeZone

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. A positive number, typically one hour (3600000).

getDSTSavings

public int getDSTSavings()

Returns the amount of time in ms that the clock is advanced during DST.

Returns:

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

useDaylightTime

public boolean useDaylightTime()

Overrides TimeZone Queries if this time zone uses Daylight Savings Time.

Overrides:

useDaylightTime in class TimeZone

inDaylightTime

public boolean inDaylightTime(Date date)

Overrides TimeZone Queries if the given date is in Daylight Savings Time.

Overrides:

inDaylightTime in class TimeZone

clone

public Object clone()

Overrides Cloneable

Overrides:

clone in class TimeZone

hashCode

public int hashCode()

Override hashCode. Generates the hash code for the SimpleDateFormat object

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Compares the equality of two SimpleTimeZone objects.

Parameters:

obj - The SimpleTimeZone object to be compared with.

Returns:

True if the given obj is the same as this SimpleTimeZone object; false otherwise.

Overrides:

equals in class Object

hasSameRules

public boolean hasSameRules(TimeZone other)

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

Parameters:

other - the TimeZone object to be compared with

Returns:

true if the given zone has the same rules and offset as this one

Overrides:

hasSameRules in class TimeZone

toString

public String toString()

Return a string representation of this time zone.

Returns:

a string representation of this time zone.

Overrides:

toString in class Object