Computer Formula For The Doomsday of A Year
For computer use, the following formulas for the Doomsday of a year are convenient.
For the Gregorian calendar:
For example, the year 2009 has a doomsday of Saturday under the Gregorian calendar (the currently accepted calendar), since
For the Julian calendar:
The formulas apply also for the proleptic Gregorian calendar and the proleptic Julian calendar. They use the floor function and astronomical year numbering for years BC.
For comparison, see the calculation of a Julian day number.
Read more about this topic: Doomsday Rule
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