Java tutorial
import java.util.Calendar; import java.util.concurrent.TimeUnit; public class Main { public static long getDifference(Calendar a, Calendar b, TimeUnit units) { return units.convert(b.getTimeInMillis() - a.getTimeInMillis(), TimeUnit.MILLISECONDS); } public static void main(String[] args) { Calendar first = Calendar.getInstance(); first.set(2008, Calendar.AUGUST, 1); Calendar second = Calendar.getInstance(); System.out.println(getDifference(first, second, TimeUnit.DAYS) + " day(s) between "); } }