Java tutorial
import java.util.*; public class Main { public static void main(String[] args) { GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance(); // get actual maximum for day_of_month int max = cal.getActualMaximum(GregorianCalendar.DAY_OF_MONTH); System.out.println("Actual Maximum:" + max); // get actual maximum for YEAR max = cal.getActualMaximum(GregorianCalendar.YEAR); System.out.println("Actual Maximum:" + max); } }