HumanCal

Are you looking for a new challenge? Try HumanCal and learn how to calculate the day of the week for any given date. You will be amazed by how easy it actually is to perform this feat.

The tutorial mode teaches you how to perform the steps needed to arrive at the answer. Afterwards you can challenge yourself in three different timer modes (1 min, 3 min, and 5 min) and record your high scores.

(Click on the status field twice to get into the tutorial mode. You will find a walkthrough of the calculations for the last date you've answered.)