Days of the week in MAPLE

Gauss, among others, gave formulas for determining the day of the week from the date (which I modified slightly from the reference below).

The MAPLEV4 calendar package implements these formulas. The MAPLEV4 worksheet gives an example of this. There are two calendars implemented: the Gregorian (after 1582) and the Julian calendars. The default is the Gregorian.

If you have MAPLEV4 and Windows 3.1 or better then here is how to load the calendar package:

• create a subdirectory "games"of your maplev4/share directory,
• create a subdirectory "calendar"of your maplev4/share/games directory,
• copy calendar.mpl into this calendar subdirectory,
• in a new session of maple type:

  read(`c:/maplev4/share/games/calendar/calendar.mpl`);
  

• To get the day of week for May 21st, 1996 (for example), simply type:

  day_of_week(5,21,1996);
  

• To get the day of the week in the Julian calendar, simply type

  day_of_week(5,21,1996,`J`);