TimeZone with Calendar confusing results

Question

I have been working with timezone conversions lately and am quite astonished by the result i get.Basically, i want to convert a date from one timezone into another. below is

Answer 1

Are you restricted to using TimeZone and Calendar? If not I suggest using the excellent Library JodaTime which makes handling time zones much easier.

Your example would then look like this:

public static void convertTimeZoneJoda(String date, String time, DateTimeZone fromTimezone, DateTimeZone toTimeZone) {
    DateTimeFormatter dtf = DateTimeFormat.forPattern("dd/MM/yyyyHH:mm").withZone(fromTimezone);
    DateTime dt = dtf.parseDateTime(date+time).withZone(toTimeZone);

    System.out.println("Time in " + toTimeZone.getID() + " : " + dt.toString());
}

public static void main(String[] args) {
    convertTimeZoneJoda("23/04/2013", "23:00", DateTimeZone.forID("EST5EDT"), DateTimeZone.forID("GMT"));
}

JodaTime also allows for convenient conversation between TimeZone and DateTimeZone.