Java SimpleTimeZone useDaylightTime() Example
SimpleTimeZone class useDaylightTime() method example. This example shows you how to use useDaylightTime() method.
Syntax is : public boolean useDaylightTime()
This method checks if this time zone uses daylight saving time or not and returns boolean true or false.
Here is the code.
/**
* @(#) UseDaylightTimeSimpleTimeZone.java
* A class representing use of method useDaylightTime() of SimpleTimeZone
class in java.util Package.
* @Version 23-May-2008
* @author Rose India Team
*/
import java.util.*;
class UseDaylightTimeSimpleTimeZone {
public static void main( String args[] ){
// cteate object of SimpleTimeZone class using conctructor.
//Constructor is SimpleTimeZone(int rawOffset, String ID)
SimpleTimeZone obj1 = new SimpleTimeZone(7200000,"America/India");
// another object of SimpleTimeZone class using another conctructor.
SimpleTimeZone obj2 = new SimpleTimeZone(-28800000,
"America/Los_Angeles", Calendar.APRIL, 1,-Calendar.SUNDAY, 7200000,
Calendar.OCTOBER, -1, Calendar.SUNDAY, 7200000, 3600000);
System.out.println("\nObject obj1 has values : \n\n" + obj1);
// useDaylightTime() method call.
boolean bool = obj1.useDaylightTime();
System.out.println("\nobj1 time zone uses daylight saving time: "+bool);
System.out.println("\nObject obj2 has values : \n\n" + obj2);
// useDaylightTime() method call.
bool = obj2.useDaylightTime();
System.out.println("\nobj2 time zone uses daylight saving time: "+bool);
}
}
/* Note:Description of 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
For these values constructor is:-
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 obj1 has values :
java.util.SimpleTimeZone[id=America/India,offset=7200000,dstSavings=3600000,
useDaylight=false,startYear=0,startMode=0,startMonth=0,startDay=0,startDayOfWeek=0,startTime=0,
startTimeMode=0,endMode=0,endMonth=0,endDay=0,endDayOfWeek=0,endTime=0,endTimeMode=0]
obj1 time zone uses daylight saving time: false
Object obj2 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]
obj2 time zone uses daylight saving time: true |
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