How to calculate the difference between two dates October 17, 2008

long diffInMilleseconds = end.getTime() – start.getTime();

long noofdays=diffInMilleseconds/86400000;

long diffInSeconds = diffInMilleseconds/1000;
long diffInMinutes = diffInSeconds/60;
long diffInHours = diffInMinutes/60;
long diffInDays = diffInHours/24;