Java tutorial
//package com.java2s; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; public class Main { public static int days(String day1, String day2, String format) { DateFormat df = new SimpleDateFormat(format); long days = 0; try { Date d1 = df.parse(day1); Date d2 = df.parse(day2); long diff = Math.abs(d1.getTime() - d2.getTime()); days = diff / (1000 * 60 * 60 * 24); } catch (Exception e) { } return (int) days; } }