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  2. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.

  3. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    Leap years have two letters, so for January and February calculate the day of the week for January 1 and for March to December calculate the day of the week for October 1. Leap years are all years that divide exactly by four, with the following exceptions: Gregorian calendar – all years divisible by 100, except those that divide exactly by 400.

  4. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    Note: In this algorithm January and February are counted as months 13 and 14 of the previous year. E.g. if it is 2 February 2010 (02/02/2010 in DD/MM/YYYY), the algorithm counts the date as the second day of the fourteenth month of 2009 (02/14/2009 in DD/MM/YYYY format) For an ISO week date Day-of-Week d (1 = Monday to 7 = Sunday), use

  5. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.

  6. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    For March, one can remember either Pi Day or "March 0", the latter referring to the day before March 1, i.e. the last day of February. For the months April through December, the even numbered months are covered by the double dates 4/4, 6/6, 8/8, 10/10, and 12/12, all of which fall on the doomsday.

  7. Discordian calendar - Wikipedia

    en.wikipedia.org/wiki/Discordian_calendar

    The days of the week are named after the five basic Discordian elements: Sweet, Boom, Pungent, Prickle, and Orange. There are 73 of these weeks per year and every year begins with Sweetmorn. Every fourth year in the Discordian calendar, starting in 2 YOLD, an extra day is inserted between Chaos 59 and Chaos 60 called St. Tib's Day.

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. February 21 - Wikipedia

    en.wikipedia.org/wiki/February_21

    Special pages; Permanent link; ... February 21 in recent years ... February 21 is the 52nd day of the year in the Gregorian calendar; ...