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day_of_week [2017.11.14 13:41] – Steve Isenbergday_of_week [2022.11.12 13:06] (current) – Steve Isenberg
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 +~~NOCACHE~~ //<fc #a0a0a0><fs small>This page last changed ~~LASTMOD~~ Visits: [{{counter|today| time| times}} today, {{counter|yesterday| time| times}} yesterday, and {{counter|total| time| total times}}]</fs></fc>//
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 =====Doomsday algorithm===== =====Doomsday algorithm=====
 Given a date, determine the day of the week it falls on.  All based on last day of February in the year, the doomsday.  Several places have info from which I've put this together for the Lexington Computer Group; see [[https://en.wikipedia.org/wiki/Doomsday_rule|Wikipedia]]'s entry.\\ Given a date, determine the day of the week it falls on.  All based on last day of February in the year, the doomsday.  Several places have info from which I've put this together for the Lexington Computer Group; see [[https://en.wikipedia.org/wiki/Doomsday_rule|Wikipedia]]'s entry.\\
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 ===Computing=== ===Computing===
-  - Determine anchor day of Century.  Pay attention to last 2 digits of year.+This is the odd-plus-eleven method. 
 +  - Determine anchor day of Century.   
 +  - Now work with the last 2 digits of year.
   - Is year odd?  If so add 11   - Is year odd?  If so add 11
   - Divide by 2   - Divide by 2
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 18 is even, /2 is 9, 9 is odd +11 is 20. Mod 7 is 6, from 7 is 1, so doomsday for 1918 is Thursday\\ 18 is even, /2 is 9, 9 is odd +11 is 20. Mod 7 is 6, from 7 is 1, so doomsday for 1918 is Thursday\\
 Nov 7 is Thursday, so 11th is Monday. Nov 7 is Thursday, so 11th is Monday.
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day_of_week.1510695672.txt.gz · Last modified: 2021.12.22 11:17 (external edit)