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Luckily, there exists a method, devised by John Conway, to calculate the day of the week of any given day, known as The Doomsday Algorithm. With a little memorization and some practice, you can calculate an answer without needing a phone or an online calendar.
Apr 26, 2020 · Doomsday method: Year code = 0, Century adjustment = 2, so Doomsday was a Tuesday in 1900. Closest Doomsday = Jan. 4 (since 2000 is a leap year), so January 30 (26 = 28 – 2 days later) was a Sunday.
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.
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: Tuesday = 1600, 2000,...
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Dec 10, 2022 · Examples. For example, if computing the Doomsday of the year 2300, you'd need to subtract $3$ at the end, to account for the false positives 2100, 2200, 2300. Another example: If you used 2080 as your base year and 2120 as your target year, you'd need to subtract 1 (accounting for the false positive 2100).
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.
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Doomsday came on a Wednesday (= 3). Since 365 1 (mod 7), it follows that Doomsday moves forward one day per year, except that it mov. s forward by 2 days in a leap year. Thus in year 1900 + n, 0 n < 100, Do. msday occured on day 3 + n + [n=4]. Here [x] denotes the integer part of x, which is to say.
