Java tutorial
//package com.java2s; //License from project: Open Source License import java.util.Calendar; public class Main { public static int isInSameDay(long day1, long day2) { Calendar c1 = Calendar.getInstance(); c1.setTimeInMillis(day1); Calendar c2 = Calendar.getInstance(); c2.setTimeInMillis(day2); if (c1.get(Calendar.DAY_OF_YEAR) == c2.get(Calendar.DAY_OF_YEAR)) return 0; else { return c1.get(Calendar.DAY_OF_YEAR) > c2.get(Calendar.DAY_OF_YEAR) ? 1 : -1; } } }