[java] How to calculate time difference in java?

String start = "12:00:00";
String end = "02:05:00";

SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss"); 

Date date1 = format.parse(start);

Date date2 = format.parse(end);

long difference = date2.getTime() - date1.getTime(); 

int minutes = (int) TimeUnit.MILLISECONDS.toMinutes(difference);

if(minutes<0)minutes += 1440; 

Now minutes will be the correct duration between two time (in minute).