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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 number from the "Difference" column.

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    Gregorian calendar. The Gregorian calendar is the calendar used in most parts of the world. [1][a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years ...

  4. New Year's Day - Wikipedia

    en.wikipedia.org/wiki/New_Year's_Day

    In the Gregorian calendar, New Year's Day is the first day of the calendar year, 1 January.Most solar calendars (like the Gregorian and Julian) begin the year regularly at or near the northern winter solstice, while cultures and religions that observe a lunisolar or lunar calendar celebrate their Lunar New Year at less fixed points relative to the solar year.

  5. Adoption of the Gregorian calendar - Wikipedia

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

    The Gregorian calendar replaced the Burmese calendar in several mainland Southeast Asian kingdoms in the second half of the 19th century. This took place in Cambodia in 1863 and Laos in 1889. [40] In 1889, Siam also switched to the Gregorian calendar as the official civil calendar, with the Rattanakosin Era (with 1782 as Year 1). [41]

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

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

    1 Jan (1896) N/A Previously used the Korean calendar. In addition to the Gregorian calendar, the Juche calendar is in use. North Macedonia: Yugoslavia: 1919 14 Jan 28 Jan 13 [25] Norway: Denmark-Norway: 1700 18 Feb 1 Mar 11 Poland: Poland: 1582 4 Oct 15 Oct 10 Local resistance [21] Poland Duchy of Prussia: 1610 22 Aug 2 Sept 10

  7. Ianuarius - Wikipedia

    en.wikipedia.org/wiki/Ianuarius

    Ianuarius. Ianuarius, Januarius, or January, fully Mensis Ianuarius ("month of Janus ") and abbreviated Ian., was the first month of the ancient Roman calendar, from which the Julian and Gregorian month of January derived. It was followed by Februarius ("February").

  8. Positivist calendar - Wikipedia

    en.wikipedia.org/wiki/Positivist_calendar

    The positivist calendar was a calendar reform proposal by Auguste Comte in 1849. Revising the earlier work of Marco Mastrofini , or an even earlier proposal by "Hirossa Ap-Iccim" ( Hugh Jones ), Comte developed a solar calendar with 13 months of 28 days, and an additional festival day commemorating the dead, totalling 365 days.

  9. Inter gravissimas - Wikipedia

    en.wikipedia.org/wiki/Inter_gravissimas

    Inter gravissimas (English: "Among the most serious...") was a papal bull issued by Pope Gregory XIII on 24 February 1582. [1][2] The document, written in Latin, reformed the Julian calendar. The reform came to be regarded as a new calendar in its own right and came to be called the Gregorian calendar, which is used in most countries today.

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