Did you know java TimeUnit class

I am not sure why Date din't do it, Calendar didn't do it and Apache DateUtils didn't do it?

Though every other product in every other company would need date diff !!!

I was introduced to TimeUnit through a retry wrapper class where I had to specify retry time using TimeUnit. So no longer we need a variable like private static final long numberOfSecondsInMinutes  = 60; :)

Date diff is a two liner with this class

1. Get the diff in millis
long diff = date1.getTime() - date2.getTime();

2. TimeUnit.MILLISECONDS.toDays(diff);

nJoy