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  2. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the

  3. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    Companies in Europe often use year, week number, and day for planning purposes. So, for example, an event in a project can happen on w43 (week 43) or w43-1 (Monday, week 43) or, if the year needs to be indicated, on w0643 (the year 2006, week 43; i.e., Monday 23 October–Sunday 29 October 2006). An ISO week-numbering year has 52 or 53 full ...

  4. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    A precise date is specified by the ISO week-numbering year in the format YYYY, a week number in the format ww prefixed by the letter 'W', and the weekday number, a digit d from 1 through 7, beginning with Monday and ending with Sunday. For example, the Gregorian date Friday, 31 January 2025 corresponds to day number 5 in the week number 05 of ...

  5. List of date formats by country - Wikipedia

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

    Short format: dd/mm/yyyy (Day first, month number and year in left-to-right writing direction) in Afar, French and Somali ("d/m/yy" is a common alternative). Gregorian dates follow the same rules but tend to be written in the yyyy/m/d format (Day first, month number, and year in right-to-left writing direction) in Arabic language.

  6. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    A mixture of Julian and Gregorian calendar, giving dates before 1582 in the Julian calendar, and dates after 1582 in the Gregorian calendar, counting 1 BC as year zero, and negative year numbers for 2 BC and earlier. French Republican Calendar: solar: Gregorian: 1793: First French Republic: In use in revolutionary France 1793 to 1805 ...

  7. Module:Date/doc - Wikipedia

    en.wikipedia.org/wiki/Module:Date/doc

    The properties of a date include its Julian date and its Gregorian serial date, as well as the day-of-week and day-of-year. Dates can be compared (for example, date1 <= date2), and can be used with add or subtract (for example, date + '3 months'). The difference between two dates can be determined with date1 - date2.

  8. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The Gregorian calendar was implemented in Russia on 14 February 1918 by dropping the Julian dates of 1–13 February 1918, [h] pursuant to a Sovnarkom decree signed 24 January 1918 (Julian) by Vladimir Lenin. The decree required that the Julian date was to be written in parentheses after the Gregorian date, until 1 July 1918. [19]

  9. 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. Converting a date between different calendars.