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| The ] for calculating the day of the week makes use of the fact that in each year, | The ] is for calculating the day of the week and makes use of the fact that in each year, | ||
| 28/29 February (2/28 or 2/29) | |||
| 4 April (4/4) | 4 April (4/4) | ||
| 6 June (6/6) | 6 June (6/6) | ||
| Line 7: | Line 8: | ||
| 12 December (12/12) | 12 December (12/12) | ||
| are all the same day of the week. This day of the week is called ]. The algorithm also defines 9/5 and 7/11 and their reverses to be Doomsday. | are all the same day of the week. This day of the week is called ] and is derived from the last day in February, be it the 28th or 29th. The algorithm also defines 9/5 and 7/11 and their reverses to be Doomsday. | ||
| Therefore, if you know what day of the week Doomsday - last day in February - is for a given year, you can easily determine the day of the week for any other date in that year. | |||
| The Doomsday algorithm was invented by ]. | The Doomsday algorithm was invented by ]. | ||
Revision as of 22:10, 26 August 2004
The Doomsday algorithm is for calculating the day of the week and makes use of the fact that in each year,
28/29 February (2/28 or 2/29) 4 April (4/4) 6 June (6/6) 8 August (8/8) 10 October (10/10) and 12 December (12/12)
are all the same day of the week. This day of the week is called Doomsday and is derived from the last day in February, be it the 28th or 29th. The algorithm also defines 9/5 and 7/11 and their reverses to be Doomsday.
Therefore, if you know what day of the week Doomsday - last day in February - is for a given year, you can easily determine the day of the week for any other date in that year.
The Doomsday algorithm was invented by John Horton Conway.
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