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April 28, 1988 was a Thursday — that’s 13,978 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 April 4 is a doomsday — count from there.
April 9, 1988
The Doomsday algorithm is six short steps. Most people get to a reliable answer in under 30 seconds after an afternoon of practice.