Algorithm for a Perpetual calendar 

Dear Mr.Netscr1be, my english is not good, sorry. Please see by http://commons.wikimedia.org/wiki/Category:Perpetual_calendars the file "Permanent_Calendar" and http://commons.wikimedia.org/wiki/Wikitable_calendar. Here is a simple solution. The result is very easy to control. The algorithm is: The days of the week for January and February are the first line in the second from February through December. I wish you much fun. greetings from saxony Karl Nimtsch