calculate time of difrent zones in the world

Calendar calendar = Calendar.getInstance();
        TimeZone fromTimeZone = calendar.getTimeZone();
        TimeZone toTimeZone = TimeZone.getTimeZone("CST");

        calendar.setTimeZone(fromTimeZone);
        calendar.add(Calendar.MILLISECOND, fromTimeZone.getRawOffset() * -1);
        if (fromTimeZone.inDaylightTime(calendar.getTime())) {
            calendar.add(Calendar.MILLISECOND, calendar.getTimeZone().getDSTSavings() * -1);
        }

        calendar.add(Calendar.MILLISECOND, toTimeZone.getRawOffset());
        if (toTimeZone.inDaylightTime(calendar.getTime())) {
            calendar.add(Calendar.MILLISECOND, toTimeZone.getDSTSavings());
        }

        System.out.println(calendar.getTime());