Time difference in Java [duplicate]

Answer 1

Alternatively, if you don't want to use JodaTime, it's pretty simple to compute the hours, minutes, and seconds from a duration in milliseconds:

public static void main(String[] args) throws ParseException {
  SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
  Date start = sdf.parse("00:44:16");
  Date end = sdf.parse("04:02:39");
  long durationMs = end.getTime() - start.getTime();

  final int oneHourMs = 3600000;
  final int oneMinuteMs = 60000;
  final int oneSecondMs = 1000;

  long hours = durationMs / oneHourMs;
  long minutes = (durationMs % oneHourMs) / oneMinuteMs;
  long seconds = (durationMs % oneMinuteMs) / oneSecondMs;

  System.out.format("%02d:%02d:%02d", hours, minutes, seconds); 
  // outputs: 03:18:23
}