Java tutorial
import java.util.Calendar; public class Main { public static void main(String[] args) { Calendar cal = Calendar.getInstance(); System.out.println("Now : " + cal.getTime()); int monthsToDecrement = -1; cal.add(Calendar.MONTH, monthsToDecrement); System.out.println("Date after decrement: " + cal.getTime()); } } /*Now : Wed Feb 18 13:52:43 PST 2009 Date after decrement: Sun Jan 18 13:52:43 PST 2009 */