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December 18, 1993 was a Saturday — that’s 11,916 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 29, 1993
The Doomsday algorithm is six short steps. Most people get to a reliable answer in under 30 seconds after an afternoon of practice.