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  2. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Perpetual Calendar Gregorian Calendar adoption dates for many countries. World records for mentally calculating the day of the week in the Gregorian Calendar ; The Calendar FAQ – Frequently Asked Questions about Calendars; Today's date (Gregorian) in over 800 more-or-less obscure foreign languages Archived 8 March 2023 at the Wayback Machine

  3. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    Date of the last day before the change Date of the first day after the change Days omitted Particulars Source Albania: Albania 1912 14 Nov 28 Nov 13 Albanian Catholics have used the Gregorian calendar since 5 Oct 1583. [3] [4] Armenia: Transcaucasian Democratic Federative Republic: 1918 17 Apr 1 May 13 [5] Austria Carinthia: 1583 14 Dec 25 Dec ...

  4. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Adoption_of_the_Gregorian...

    Since 1997, North Korea officially counts years based on the Juche era, the first year of which is 1912, the year of Kim Il Sung's birth, with Gregorian months and days. The current Gregorian year 2025 corresponds to Juche year 114.

  5. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    At Jefferson's birth, the difference was eleven days between the Julian and Gregorian calendars and so his birthday of 2 April in the Julian calendar is 13 April in the Gregorian calendar. Similarly, George Washington is now officially reported as having been born on 22 February 1732, rather than on 11 February 1731/32 (Julian calendar). [ 26 ]

  6. Common Era - Wikipedia

    en.wikipedia.org/wiki/Common_Era

    The idea of numbering years beginning from the date that he believed to be the date of birth of Jesus, was conceived around the year 525 by the Christian monk Dionysius Exiguus. He did this to replace the then dominant Era of Martyrs system, because he did not wish to continue the memory of a tyrant who persecuted Christians.

  7. Inter gravissimas - Wikipedia

    en.wikipedia.org/wiki/Inter_gravissimas

    It marks the beginning of year 1582 if that year began on 25 December, the traditional date of the birth or nativity of Jesus. "Indictione decima" (Indiction 10) is the year beginning 1 January, which agrees with modern reckoning. All of these years agree that the bull was dated 24 February 1582, using the modern 1 January beginning of the year.

  8. List of date formats by country - Wikipedia

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

    All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...

  9. Date of the birth of Jesus - Wikipedia

    en.wikipedia.org/wiki/Date_of_the_birth_of_Jesus

    While this implies a birth in December and possibly on the 25th, [121] Africanus did not offer a birth date for Jesus, [122] and was not an influential writer at the time. [123] Thomas C. Schmidt argues that Hippolytus of Rome dated the birth of Jesus on 25 December.