If it is half past eleven p.m. and the New Year's knocking on your door and you still didn't figure out a present for your geek boyfriend or a programmer colleague, consider this dumb corendar (calendar). It doesn't have many bells and whistles, and it is far from being a valid calendar, but it is cool anyway. You can take this mildly geek version or —if binary dates, alphabetically sorted weekdays and month names just won't do it for your friends— choose the hardcore version.

The calendar was made invalid intentionally; this will provide your friends with little something to debug and rant about.