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  2. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    The month the Hobbits call Solmath is rendered in the text as February, and therefore the date February 30 exists in the narrative. [21] February 30, 1951, is the last night of the world in Ray Bradbury's short story "Last Night of the World". [22] June 31 is a fictional date in the Soviet film 31 June.

  3. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.

  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. Help:Sortable tables - Wikipedia

    en.wikipedia.org/wiki/Help:Sortable_tables

    Month-day-year or day-month-year. If a number for a day is missing, date sorting is broken. Abbreviated months work too. The year must be on the end, and a number can not be used for the month. Either will break date sorting. Date sorting works correctly in the first 2 tables below. Years before 100 (for example, year 99) break sorting.

  6. List of date formats by country - Wikipedia

    en.wikipedia.org/wiki/List_of_date_formats_by...

    Long date with weekday: onsdag(,) den 21. december 1994. Numeric date: 1994-06-07 [48] (The format dd.mm.(yy)yy is the traditional Danish date format. [49] The international format yyyy-mm-dd or yyyymmdd is also accepted, though this format is not commonly used. The formats d. 'month name' yyyy and in handwriting d/m-yy or d/m yyyy are also ...

  7. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    When using serial numbers for dates (e.g. in spreadsheets), doy is the serial number for a date minus the serial number for 31st December of the previous year, or alternatively minus the serial number for 1st January the same year plus one. Algorithm. Subtract the weekday number from the ordinal day of the year. Add 10. Divide by 7, discard the ...

  8. 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).

  9. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    [17] The separator used between date values (year, month, week, and day) is the hyphen, while the colon is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as "2009-01-06" in the extended format or as "20090106" in the basic format without ambiguity.