Java tutorial
import java.text.SimpleDateFormat; import java.util.Date; import java.util.TimeZone; public class Main { public static void main(String[] args) throws Exception { SimpleDateFormat broken = new SimpleDateFormat("kk:mm:ss"); broken.setTimeZone(TimeZone.getTimeZone("Etc/UTC")); SimpleDateFormat working = new SimpleDateFormat("HH:mm:ss"); working.setTimeZone(TimeZone.getTimeZone("Etc/UTC")); Date epoch = new Date(0); System.out.println(broken.format(epoch)); System.out.println(working.format(epoch)); } }