Talk:Doomsday rule
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Day of the week x-11 or x+89 for last two digits of year[edit]
2000 - (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"?[edit]
The 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[edit]
The 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[edit]
Why 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[edit]
While 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