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  2. Ordinal date - Wikipedia

    en.wikipedia.org/wiki/Ordinal_date

    Mission control center's board with time data, displaying universal time with ordinal date (without year) prepended, on 22nd October 2013 (i.e. 2013-295). An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also known as ...

  3. Template:Calendar date - Wikipedia

    en.wikipedia.org/wiki/Template:Calendar_date

    A template for displaying moving calendar dates Template parameters [Edit template data] Parameter Description Type Status Name of holiday/event holiday The name of the holiday or event Example Rosh Hashana String required Holiday year year The year to display the holiday dates for Example 2019 String required Display format option format Options for controlling display output such as for an ...

  4. Determination of the day of the week - Wikipedia

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

    The last ten months of 2022 correspond to the last ten months of 2016. 2023 is a common year starting on Sunday, which means that it corresponds to the 2017 calendar year. 2024 is a leap year starting on Monday, which means that it corresponds to the 1996 calendar year. The first two months of 2024 correspond to the first two months of 2018.

  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

    The doomsday's anchor day calculation is effectively calculating the number of days between any given date in the base year and the same date in the current year, then taking the remainder modulo 7. When both dates come after the leap day (if any), the difference is just 365 y + ⁠ y / 4 ⁠ (rounded down).

  7. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    represents the progression of the day of the week based on the year. Assuming that each year is 365 days long, the same date on each succeeding year will be offset by a value of =. Since there are 366 days in each leap year, this needs to be accounted for by adding another day to the day of the week offset value.

  8. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    The first year of the calendar is exactly 4750 years prior to the start of the Gregorian calendar. ... It is a set of 12 months that may start at any date in a year ...

  9. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    Find the week number of Saturday 5th November 2016 (leap year): Find the ordinal day number first: moy = 11 dom = 5 leap = 1 add = 305, from table lookup doy = 305 + 5 = 310. Alternatively, use spreadsheet serial day numbers instead: off = 42369, i.e. 31st December 2015 day = 42679 doy = 42679 − 42369 = 310. Finally, find the week number:

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