A day-of-week calculator determines what day of the week any given date falls on. The Doomsday algorithm (Conway) or modular arithmetic can compute this for any date in the Gregorian calendar.
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Pro Tip
A quick modern shortcut: type any date into Google ("what day was March 15, 1990?") and it will tell you instantly. For mental calculation, the Doomsday algorithm requires memorizing just a few anchor dates.
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Did You Know?
John Conway (mathematician, 1937–2020) could calculate the day of any date in his head in under 2 seconds using his Doomsday algorithm. He reportedly practiced by computing the day for random dates on a pocket calculator to check his mental calculations.
References
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