Links for calendar algorithms.?

Question

i am looking for algorithms that can answer questions such as: Xth day of a month M in year Y(third monday of january 2003 for ex).
Any tips or links?
Thanks.

Answer 1

Sorry - I made a couple of blunders in my last example. Check this instead:
import java.util.*;
public class CalendarTest {
    public static void main(String[] a) {
        Calendar c= new GregorianCalendar();
        int d= Calendar.MONDAY;
        c.set(Calendar.YEAR, 2003);
        int x= 3; // 3 for 3rd occurence
        int m= Calendar.JANUARY;
        if(a.length > 0)
            c.set(Calendar.YEAR, Integer.parseInt(a[0]));
        if(a.length > 1)
            m= Integer.parseInt(a[1])-1;
        if(a.length > 2)
            x= Integer.parseInt(a[2]);
        c.set(Calendar.MONTH, m);
        c.set(Calendar.DAY_OF_WEEK, d);
        if(c.get(Calendar.MONTH) > m)
            c.add(Calendar.DAY_OF_YEAR, -(c.get(Calendar.DAY_OF_MONTH)+7)/7*7);
        int add= (x-(c.get(Calendar.DAY_OF_MONTH)+6)/7)*7;
        if(add != 0) {
            c.add(Calendar.DAY_OF_MONTH, add);
        System.out.println(c.getTime());
}Compile the program, and enter parameters as:
$java CalendarTest <year> <month> <week>
or
$java CalendarTest <year> <month>
or
$java CalendarTest <year>
or simply
$java CalendarTest
Year defaults to 2003, month to January (1), and week to 3.
Kind regards