TimeZone timeZone = TimeZone.getTimeZone("Australia/Sydney");
GregorianCalendar defaultDate = new GregorianCalendar(timeZone);
Date date = defaultDate.getTime();

Date d = new Date();
DateFormat df = new SimpleDateFormat();
df.setTimeZone(TimeZone.getTimeZone("Australia/Sydney"));

String formattedDate = df.format(d);   // returns Sydney date/time
Date myDate = df.parse(formattedDate); // returns local time(ET)

import java.util.*;
import java.text.*;

public class TzPrb {
    public static void main(String[] args) {
        Date d = new Date();
        System.out.println(d);

        DateFormat df = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        df.setTimeZone(TimeZone.getTimeZone("Australia/Sydney"));
        System.out.println(df.format(d));
        df.setTimeZone(TimeZone.getTimeZone("Europe/London"));
        System.out.println(df.format(d));
    }
}