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September 1, 1939 was a Friday — that’s 31,740 days ago. Below you can see exactly how to work the weekday out in your head with the Doomsday algorithm, along with a few other facts about the date.
Same month, one different day. You already know September 5 is a doomsday — count from there.
September 12, 1939
The Doomsday algorithm is six short steps. Most people get to a reliable answer in under 30 seconds after an afternoon of practice.