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June 23, 1912 was a Sunday — that’s 41,671 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 June 6 is a doomsday — count from there.
June 4, 1912
The Doomsday algorithm is six short steps. Most people get to a reliable answer in under 30 seconds after an afternoon of practice.