Talk:Doomsday rule
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Day of the week x-11 or x+89 for last two digits of year
edit2000 - (2089 (Jan-Feb) and 1989 Mar-Dec)
2001 - 1990
2002 - 1991
2003 - (1992 (Jan-Feb) and 2092 Mar-Dec)
2004 - (2093 (Jan-Feb) and 1993 Mar-Dec)
2005 - 1994
2006 - 1995
2007 - (1996 (Jan-Feb) and 2096 Mar-Dec)
2008 - (2097 (Jan-Feb) and 1997 Mar-Dec)
2009 - 1998
2010 - 1999
2011 - (2000 (Jan-Feb) and sadly no YY00 for Mar-Dec) although 2100 does not work since it's not a leap year.
2005 and 1994 both start and end on Saturday.
2006 and 1995 both start and end on Sunday.
2007 from January 1 to February 28 share the same calendar as 1996
2007 from March 1 to December 31 share the same calendar as 2096
January 1, 1996 was a Monday
January 1, 2007 was a Monday
February 28, 1996 was a Wednesday
February 28, 2007 was a Wednesday
March 1, 2096 will be a Thursday
March 1, 2007 was a Thursday
December 31, 2096 will be a Monday
December 31, 2007 was a Monday
Both January 1, 2008 and January 1, 2097 fall on a Tuesday
Both February 28, 2008 and February 28, 2097 fall on a Thursday
--2605:A000:1103:55F:CD63:66A3:A1E1:7F51 (talk) 02:23, 25 September 2020 (UTC)
What is the "15th doomsday"?
editThe article states that Conway "died on the 15th doomsday 2020". How is 11 April the 15th doomsday of 2020? Kansaichris (talk) 03:40, 9 December 2021 (UTC)
- The doomsday in 2020 was Saturday, and he died on the 15th Saturday of 2020. But it's not a factoid that belongs in an encyclopaedia, unless sources document it is somehow noteworthy. Anyway, the coincidence is meagre; 14% of all days are doomsdays in this sense.--Nø (talk) 09:00, 9 December 2021 (UTC)
Year's first Sunday method
editThe Year's First Sunday method adds further simplification to the odd+11 method, making the algorithm truly simple -- memorizable in one sitting.
https://firstsundaydoomsday.blogspot.com/2011/01/learn-by-example.html Jbaber (talk) 04:02, 25 January 2023 (UTC)
It’s Doomsday
editWhy is there the section “Anchor days for some contemporary years”? It’s Doomsday (itself!) of those years.
A couple of years ago, the section was named Doomsdays for some contemporary years… Then someone changed it and it makes no sense. The anchor days (of a century) are those you use to count the DOOMSDAY of the year! E.g. anchor day of 2000-2099 is Tuesday … and Doomsday of 2022 was Monday. Hopefully you understand what I mean. 85.237.234.127 (talk) 19:25, 13 March 2023 (UTC)
Please include examples for years later than 2100
editWhile the text of this article makes it clear that the non-existence of a February 29, 2100 will not derail the computations, please include some examples from a year later than 2100 to show that this is so and enable readers to follow the calculations through years such as 2100, 2200, and 2300 that won't be leap-years even though 2000 was and 2400 will be.2600:1700:6759:B000:1031:6B84:3136:E1F7 (talk) 09:15, 6 August 2023 (UTC)Christopher Lawrence Simpson
- Frankly, I think there are allready way too many examples, too long tables, etc., in the article, obscuring the simplicity of the Doomsday method. Nø (talk) 14:55, 6 August 2023 (UTC)