Specific time in different timezones

Hello all,
I have the following scenario. My developement pc is in a PDT timezone and my server is in a EDT timezone. Plus, the date entries in the server need to be GMT values.
I know that, right now at least, there are 3 hours of difference between PDT and EDT, and 4 hours of difference between EDT and GMT.
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat timeDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss, z");
        Date date = calendar.getTime();
        System.out.println("server:\t" + timeDateFormat.format(date));
        timeDateFormat.setTimeZone(TimeZone.getTimeZone("EST5EDT"));
        System.out.println("local:\t" + timeDateFormat.format(date));
        timeDateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
        System.out.println("GMT:\t" + timeDateFormat.format(date));output:
server:     2007-11-02 11:15:43, PDT
local:     2007-11-02 14:15:43, EDT
GMT:     2007-11-02 18:15:43, GMT
Now, I need to convert today's midnight time (EDT) to GMT from my pc having PDT timezone.
        SimpleDateFormat timeDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss, z");
        String today = "2007-11-02 00:00:00, EST5EDT";
        Date date = timeDateFormat.parse(today);
        System.out.println("server:\t" + timeDateFormat.format(date));
        timeDateFormat.setTimeZone(TimeZone.getTimeZone("PST8PDT"));
        System.out.println("local:\t" + timeDateFormat.format(date));
        timeDateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
        System.out.println("GMT\t" + timeDateFormat.format(date));output:
server:     2007-11-02 00:00:00, EST
local:     2007-11-01 22:00:00, PDT
GMT:     2007-11-02 05:00:00, GMT
1. Why does it show EST instead of EST5EDT or just EDT?
2. Why there are now 2 hours of difference between EDT (EST) and PDT? I think it's related to 1.
I'm pulling my hair out of my head with this one. I'd really appreciate any comments on this. Thanks

fun1asma wrote:
Today Nov 5th, my code is working fine. My problem is obviously related to the daylight saving time. Since I seem to be using a recent Java Platform (1.5.0_11), does this mean that DST are not fully supported by SimpleDateFormat?As far as I know, Java 1.5.0_11 supports the TZ rules in the U.S. as they exist now. It's possible that there's a bug in that support. It may also be that Java is using your OS's notion of TZs and your OS may not be up to date. I forget the exact rules as to when Java uses its own TZ rules vs. those of the OS.

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package test.timezone;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.LinkedList;
import java.util.List;
import java.util.TimeZone;
public class TZCalc {
public static void main(String[] args) {
List<TimeZone> list = new LinkedList<TimeZone>();
list.add(TimeZone.getTimeZone("Europe/London"));
list.add(TimeZone.getTimeZone("Europe/Berlin"));
list.add(TimeZone.getTimeZone("Australia/Sydney"));
list.add(TimeZone.getTimeZone("America/New_York"));
list.add(TimeZone.getTimeZone("Asia/Bangkok"));
list.add(TimeZone.getTimeZone("Asia/Hong_Kong"));
for (TimeZone tz : list) {
Calendar cal = new GregorianCalendar(tz);
SimpleDateFormat formatter = (SimpleDateFormat) DateFormat
.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.MEDIUM);
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}Edited by: jbegham on Apr 19, 2010 3:46 AM
Edited by: jbegham on Apr 19, 2010 3:47 AM

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