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  2. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    These formulas are based on the observation that the day of the week progresses in a predictable manner based upon each subpart of that date. Each term within the formula is used to calculate the offset needed to obtain the correct day of the week. For the Gregorian calendar, the various parts of this formula can therefore be understood as follows:

  3. 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.

  4. 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.

  5. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    Thurston 1909 continues: . Now, as a moment's reflection shows, if 1 January is a Sunday, all the days marked by A will also be Sundays; if 1 January is a Saturday, Sunday will fall on 2 January, which is a B, and all the other days marked B will be Sundays; if 1 January is a Monday, then Sunday will not come until 7 January, a G, and all the days marked G will be Sundays ...

  6. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Breguet classique Grand complication perpetual calendar. Offices and retail establishments often display devices containing a set of elements to form all possible numbers from 1 through 31, as well as the names/abbreviations for the months and the days of the week, to show the current date for convenience of people who might be signing and dating documents such as checks.

  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. Date of Easter - Wikipedia

    en.wikipedia.org/wiki/Date_of_Easter

    In practice, for the purpose of calculating Easter, this need not be done for all 365 days of the year. For the epacts, March comes out exactly the same as January, because 31+28 days = 30+29 epacts, so one need not calculate January or February. To avoid the need to calculate the dominical letters for January and February, start with D for 1 ...

  9. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    For example, the Gregorian date Saturday, 22 February 2025 corresponds to day number 6 in the week number 08 of 2025, and is written as 2025-W08-6 (in extended form) or 2025W086 (in compact form). The ISO year is slightly offset to the Gregorian year; for example, Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of ...