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  2. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    Many computer systems measure time and date using Unix time, an international standard for digital timekeeping.Unix time is defined as the number of seconds elapsed since 00:00:00 UTC on 1 January 1970 (an arbitrarily chosen time based on the creation of the first Unix system), which has been dubbed the Unix epoch.

  3. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    Microsoft Excel displays the day before January 1, 1900 (the earliest date it can represent) as January 0, 1900. [17] It also treats 1900 incorrectly as a leap year (whereas only centuries divisible by 400 are), so it displays the day before March 1, 1900 as the non-existent February 29 instead of February 28. This means March 1, 1900 is the ...

  4. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus ) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover , for a given year.

  5. 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.

  6. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    27 week years are 5 days longer than the month years (371 − 366), 6.75%. 44 week years are 6 days longer than the month years (371 − 365), 11%. 70 week years are 2 days shorter than the month years (364 − 366), 17.5%. 259 week years are 1 day shorter than the month years (364 − 365), 64.75%. The table shows the long years in a 400-year ...

  7. Determination of the day of the week - Wikipedia

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

    If Monday is the first day of the week, the days may be coded 1 to 7, for Monday through Sunday, as is practiced in ISO 8601. The day designated with 7 may also be counted as 0, by applying the arithmetic modulo 7, which calculates the remainder of a number after division by 7. Thus, the number 7 is treated as 0, the number 8 as 1, the number 9 ...

  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. Epoch - Wikipedia

    en.wikipedia.org/wiki/Epoch

    In the French Republican Calendar, a calendar used by the French government for about twelve years from late 1793, the epoch was the beginning of the "Republican Era", September 22, 1792 (the day the French First Republic was proclaimed, one day after the Convention abolished the Ancien Regime).