Java tutorial
//package com.java2s; /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ import java.util.concurrent.TimeUnit; public class Main { public static long getTimeDiff(long start, long end) { long diffInMillis = start - end; long diffInDays = TimeUnit.MILLISECONDS.toDays(diffInMillis); return diffInDays; } }