Problem with calender timezone

hi first i got the instance of the calendar and printed the date? The date showed in IST which is my timezone. After this i changed the Timzone of the calendar to "UTC" and printed the date. still the date comes in IST and the date is same before and after changing the timezone. how to understand this? why is the time not changing according to the timezone set? why the time is always showing in IST which is my OS timezone?

murrayb9654 wrote:
DrClap wrote:
Date objects don't have timezones. That's how to understand it. If you want to display a Date in a particular timezone then create a SimpleDateFormat and apply that particular timezone to it, then use its format() method to display the Date.hi thank you. Then i am confused with the api. please see the following.
the following is the api
java.util.Calendar.setTimeZone(TimeZone value)
this mean that we can set the timezone to the calender. am i right?Yes.
if date object does not contain timezone information when i printed it it clearly prints IST . how is it able to that?You printed a string representation of the date which interpreted the date as IST. It's able to do that by computer programming. And after all it has to represent the date in some time zone -- which time zone should it choose if not your system's default time zone?
Suppose i have date like 22-03-2009 12:30:30 That isn't a date. It could represent a variety of dates, depending on what time zone you use to interpret it.
when i use dateformat with a particular timezone info how will it convert the date exactly to that time zone when it don't know the timezone of the given date.You aren't paying attention. A Date doesn't have a timezone. It is simply the number of milliseconds since a particular instant of time. That instant of time (I'm recapping the API documentation which you haven't read here) was midnight on 1 January 1970 in UTC. And the SimpleDateFormat object represents that instant, or any number of milliseconds after it, using computer programming. Note that the SimpleDateFormat object will represent that instant differently depending on what timezone you assign to the SimpleDateFormat object. You could write some code to try that yourself.

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Hi,
I'm having problem with Timezone IST, which is GMT + 05:30.
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When Timezone on machine is IST, correct value is returned.
See the below example. All four dates are same ( LKT is also + 05:30).
When timezone on machine is IST, all four dates are displayed same.
For any other timezone, IST date is displayed incorrectly, rest 3 are displayed correctly.
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Test {
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        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEE MMM d HH:mm:ss Z yyyy");
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        System.out.println(date3.toString());
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        System.out.println("Date1 equals Date3? " + date1.equals(date3));
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        System.out.println("Date3.getTime() " + date3.getTime());
        System.out.println("Date4.getTime() " + date4.getTime());
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Wed Sep 02 02:17:41 IST 2009
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Wed Sep 02 02:17:41 IST 2009
Wed Sep 02 02:17:41 IST 2009
Date1 equals Date2? true
Date1 equals Date3? true
Date1 equals Date4? true
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Date2.getTime() 1251838061000
Date3.getTime() 1251838061000
Date4.getTime() 1251838061000
Output when timezone on client is GMT (Casablanca):
Tue Sep 01 15:47:41 ACT 2009
Tue Sep 01 19:17:41 ACT 2009
Tue Sep 01 15:47:41 ACT 2009
Tue Sep 01 15:47:41 ACT 2009
Date1 equals Date2? false
Date1 equals Date3? true
Date1 equals Date4? true
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Date2.getTime() 1251850661000
Date3.getTime() 1251838061000
Date4.getTime() 1251838061000
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Tue Sep 01 13:47:41 PDT 2009
Tue Sep 01 17:17:41 PDT 2009
Tue Sep 01 13:47:41 PDT 2009
Tue Sep 01 13:47:41 PDT 2009
Date1 equals Date2? false
Date1 equals Date3? true
Date1 equals Date4? true
Date1.getTime() 1251838061000
Date2.getTime() 1251850661000
Date3.getTime() 1251838061000
Date4.getTime() 1251838061000
IS this a bug in java??
Regards

Your program is in error. PDT and LKT are not valid time zone ids in Java. There may be other problems, also, I didn't check.
I know this program produces valid results, you can try it
import java.text.DateFormat;
import java.util.Date;
import java.util.TimeZone;
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