datetime - How to calculate difference between two date(date object) in Java -

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i have 2 date in form as:

date1 = tue jan 01 00:00:00 npt 2013 date2 =  tue sep 30 00:00:00 npt 2014

now need find difference between these 2 dates.

how can in java or in groovy.

convert dates miliseconds , operate them:

long diffinmills = date2.gettime() - date1.gettime();

in seconds

diffinmills / 1000

in minutes

diffinmills / (1000*60)

in hours

diffinmills / (1000*60*60)

in days

diffinmills / (1000*60*60*24)

M16