Java SimpleTimeZone setStartRule() Example
SimpleTimeZone class setStartRule() method example. This example shows you how to use setStartRule() method.
Syntax is : public void setStartRule(int startMonth, int startDay, int startDayOfWeek, int startTime, boolean after)
This method 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 7th.
Here is the code.
/**
* @(#) SetStartRule3SimpleTimeZone.java
* A class representing use of method setStartRule() of SimpleTimeZone
class in java.util Package.
* @Version 23-May-2008
* @author Rose India Team
*/
import java.util.*;
class SetStartRule3SimpleTimeZone {
public static void main( String args[] ){
// Constructor of SimpleTimeZone class
SimpleTimeZone obj = new SimpleTimeZone(-28800000,
"America/Los_Angeles", Calendar.APRIL, 1,-Calendar.SUNDAY, 7200000,
Calendar.OCTOBER, -1, Calendar.SUNDAY, 7200000, 3600000);
System.out.println("Object obj has values : \n" + obj);
// setStartRule() method call.
obj.setStartRule( Calendar.MAY, 2, Calendar.TUESDAY, 3600000, false);
System.out.println("\nSet start rules successfully!\n\n");
System.out.println("New object has values : \n\n" + obj);
}
}
/* Note: Method changes start rules for this object 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).
## Another constructor of SimpleTimeZone class.
For example: // 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)
There are some rules to pass the values of arguments in constructor:
# 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. */ |
Output of the program.
Object obj has values :
java.util.SimpleTimeZone[id=America/Los_Angeles,offset=-28800000,dstSavings=3600000,
useDaylight=true,startYear=0,startMode=3,startMonth=3,startDay=1,startDayOfWeek=1,
startTime=7200000,startTimeMode=0,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,
endTime=7200000,endTimeMode=0]
Set start rules successfully!
New object has values :
java.util.SimpleTimeZone[id=America/Los_Angeles,offset=-28800000,dstSavings=3600000,
useDaylight=true,startYear=0,startMode=4,startMonth=4,startDay=2,startDayOfWeek=3,
startTime=3600000,startTimeMode=0,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,
endTime=7200000,endTimeMode=0] |
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