Harry R. Schwartz

Code writer, sometime Internet enthusiast, attractive nuisance.

The author at the Palais du Luxembourg in Paris, November 2022. hacker news gitlab sourcehut pinboard librarything 1B41 8F2C 23DE DD9C 807E A74F 841B 3DAE 25AE 721B


British Columbia



Zeller’s Congruence


Published .
Tags: computer-science, math.

Zeller’s congruence is an impressively unlikely constant-time algorithm for finding the day of the week for any date in the Gregorian or Julian calendar.

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