Doomsday trainer
Any date from 1583 to 2599. Name its weekday, then check the working.
Your date
Which weekday is this?
Want these right every time? The Doomsday app's free lessons teach each step →
10 dates done. The Doomsday app takes it from here: a 48-lesson course, ten drills that each target one step, a rating and leaderboards.
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New to this? The five-minute guide explains the four steps, and Numberphile has a good video on it.
The Doomsday app teaches it properly, with a 48-lesson course and drills for each step.