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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. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS.It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA).

  4. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    Solar astronomic phenomena, such as equinoxes and solstices, vary in the Gregorian calendar over a range spanning three days, over the course of each 400-year cycle, while the ISO Week Date calendar has a range spanning 9 days. For example, there are March equinoxes on 1920-W12-6 and 2077-W11-5 in UT.

  5. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    The overall function, , normalizes the result to reside in the range of 0 to 6, which yields the index of the correct day of the week for the date being analyzed. The reason that the formula differs between calendars is that the Julian calendar does not have a separate rule for leap centuries and is offset from the Gregorian calendar by a fixed ...

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    Learn tips to yield better searches, like filtering your search by location, date range, or specific category with AOL Search FAQs. AOL.com · Nov 6, 2023 Navigate, read and search on AOL.com

  7. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Thus, for any date except February 29, the intervals between common years falling on a particular weekday are 6, 11, 11. See e.g. at the bottom of the page Common year starting on Monday the years in the range 1906–2091. For February 29 falling on a particular weekday, there is just one in every 28 years, and it is of course a leap year.

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  9. Date of Easter - Wikipedia

    en.wikipedia.org/wiki/Date_of_Easter

    The range of dates in the Gregorian calendar of the Eastern Paschal full moon moves one day later every time there is a solar correction, so from 2100 to 2199 it will be 5 April to 9 May. At present there are five years per cycle when the Eastern Easter is several weeks later than the Western, at golden numbers 3, 8, 11, 14, and 19.