First Sunday Doomsday Algorithm

A method for finding the day of the week for any date -- in your head.

Thursday, January 27, 2011

Learn by Example

[Revised 7/29/2011]
This quick summary will show you, by example, how to determine the day of the week for any date.

Wednesday, December 2, 2009

Learn the First Sunday Doomsday Algorithm

[Revised 8/17/2011]
This longer article will show you how to determine the day of the week for any given date -- without consulting a calendar. It covers some history (of calendars and methods) and explains how this method works, and why it works.