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day_of_week [2017.11.14 18:46]
smismi7 		day_of_week [2020.12.29 09:38] (current)
smismi7 [Convert Fahrenheit to Centigrade and Back In Your Head]
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 +~~NOCACHE~~
 =====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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 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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  • Last modified: 2017.11.14 18:46
  • by smismi7