Formatting a date that should be GMT

Question

Hi,
From an API I get time in milliseconds and I put that value into a java.util.Date object. The time is in UTC and my local time zone is EST. I want to display this value, adjusted to the user specified time zone, but I can't get how to tell the Calandar class that the time I giving it is UTC and not EST, so it is adjusting it wrong. Also, I can't assume what the local timezone will be. So far my code looks like:
   // date (Date), gmtOffset (int) and format (String) are method inputs
  int offsetAdjusted = gmtOffset * (3600000);
  SimpleTimeZone tz = new SimpleTimeZone(offsetAdjusted,gmtOffset+":00");
  Calendar cal = Calendar.getInstance( );
  cal.setTimeZone(tz);
  SimpleDateFormat dateFormat = new SimpleDateFormat(format);
  dateFormat.setCalendar(cal);
  System.out.println(dateFormat.format(date) );any help would be very much appreciated.

Answer 1

import java.awt.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
public class ShowingGmtTime
    public static void main(String[] args)
        String[] ids = TimeZone.getAvailableIDs(+8*60*60*1000);
        for(int i = 0; i < ids.length; i++)
            System.out.println(ids);
DateFormat df = new SimpleDateFormat("HHmm ddMMMyyyy");
Date now = new Date();
System.out.println("local time = " + df.format(now));
TimeZone gmtZone = TimeZone.getTimeZone("GMT");
df.setTimeZone(gmtZone);
System.out.println("GMT time = " + df.format(now));