This is the JavaScript manifestation of the Day-of-the-Week Formula from the 1984 Teacher Brothers Almanac. If you want this form to work in Netscape, you must use version 6 or later. I've tried and tried and tried and tried to make the script work in Netscape 4 and, to put it bluntly, I don't give a damn anymore. If you want to use the script, go ahead and copy it from the source html. This works for Gregorian dates only.