Java tutorial
import java.util.*; public class Main { public static void main(String[] args) { GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance(); // print the current date and time System.out.println(cal.getTime()); // roll a month cal.roll(GregorianCalendar.MONTH, true); System.out.println("Date:" + cal.getTime()); // roll a year backwards cal.roll(GregorianCalendar.YEAR, false); System.out.println("Date:" + cal.getTime()); } }