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The Doomsday Algorithm - Calculating the Weekday of any given Date. By Konstantin Bikos. In 1970, British mathematician John Conway devised a way to quickly calculate the weekday of any given date without the help of calculators, computers, or calendars
How to Mentally Calculate the Day of the Week for Any Date. The so-called doomsday algorithm uses clever mental arithmetic and mnemonic tricks to enable a quick determination.
The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years.
Feb 22, 1994 · The Doomsday Algorithm gives the day of the week for any date (and you can do it in your head) Created 1994-02-22, Updated 2024-01-04 with examples for 2024. Overview. The Doomsday Algorithm is presented in the following sections. February 28th or 29th: Doomsday is the last day of February.
Nov 9, 2020 · The algorithm. The Doomsday rule takes advantage of the fact that patterns in calendars repeat every so often. Here's a basic diagram of what the algorithm is actually doing: It basically narrows down the weekday by first looking at the century given, then the year, then the month and finally pinponting the exact date.
In 1970, British mathematician John Conway devised a way to use the doomsday phenomenon to quickly calculate the weekday of any given date without the help of calculators, computers, or calendars. His algorithm is based on the fact that there are some dates that inevitably share the same weekday within any given year:
Doomsday Algorithm. Determine the "anchor day" for the century. When advancing a century from a century you know the Doomsday for, go back two days, unless the new century is divisible by 400, in which case only go back one day. Use the anchor day for the century to calculate the doomsday for the year. Century Day:
