How to find the number of days between two dates in java or groovy?

Question

I have a method which uses following logic to calculate difference between days.

long diff = milliseconds2 - milliseconds1;
long diffDays = diff / (24 * 60 *         


        

Answer 1

  GregorianCalendar cal1 = new GregorianCalendar(2011,2,9); 
  GregorianCalendar cal2 = new GregorianCalendar(2011,2,19); 
  long ms1 = cal1.getTime().getTime(); 
  long ms2 = cal2.getTime().getTime(); 
  long difMs = ms2-ms1; 
  long msPerDay = 1000*60*60*24; 

  double days = difMs / msPerDay;