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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. 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.

  5. Add these 2024 February holidays and observances to your ...

    www.aol.com/news/full-list-february-holidays...

    Presidents’ Day. World Day for Social Justice. February 21. Language Day. National Grain Free Day. National Sticky Bun Day. February 22. Be Humble Day. National Chili Day. National Cook a Sweet ...

  6. February 21 - Wikipedia

    en.wikipedia.org/wiki/February_21

    Special pages; Permanent link; Page information ... February 21 is the 52nd day of the year in the Gregorian calendar; ... On This Day; Historical Events on February 21

  7. Here's when the holidays and special dates are in 2024

    www.aol.com/heres-holidays-special-dates-2024...

    St. Patrick's Day: Sunday, March 17 NYC Pride Parade: Sunday, June 30 This article originally appeared on NorthJersey.com: Holidays 2024: Here are the special days and dates

  8. 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.

  9. List of observances in the United States by presidential ...

    en.wikipedia.org/wiki/List_of_observances_in_the...

    The policy of issuing proclamations calling for the observance of special days or events is in 1 CFR Section 19.4, which allows for the responsibility for the preparation and presentation of proposed proclamations calling for the observance of special days, or events to the Director of Management and Budget to such agencies as deemed appropriate.