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December 13, 1989 was a Wednesday — that’s 13,378 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 December 12 is a doomsday — count from there.
December 24, 1989
The Doomsday algorithm is six short steps. Most people get to a reliable answer in under 30 seconds after an afternoon of practice.