The Doomsday rule, also called the Doomsday algorithm, is a method for determining the day of the week for any given date. It was devised by the mathematician John Conway in 1973, drawing on inspiration from a perpetual calendar algorithm created by Lewis Carroll. The method works because the Gregorian calendar repeats in 400-year cycles and because each year has a set of easily memorized dates, called doomsdays, that always fall on the same day of the week.
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Wikipedia: Doomsday rule
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The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date.
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