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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 ...

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar is proleptic before 1582 (calculated backwards on the same basis, for years before 1582), and the difference between Gregorian and Julian calendar dates increases by three days every four centuries (all date ranges are inclusive).

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

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

    For explanation, see the article about the Gregorian calendar. Except where stated otherwise, the transition was a move by the civil authorities from the Julian to the Gregorian calendar. In religious sources it could be that the Julian calendar was used for a longer period of time, in particular by Protestant and Eastern Orthodox churches. The ...

  5. 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]

  6. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    The Gregorian calendar has the same months and month lengths as the Julian calendar, but, in the Gregorian calendar, year numbers evenly divisible by 100 are not leap years, except that those evenly divisible by 400 remain leap years [34] (even then, the Gregorian calendar diverges from astronomical observations by one day in 3,030 years).

  7. Adoption of the Gregorian calendar - Wikipedia

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

    By the 20th century, the date on the Julian calendar was 13 days behind that on the Gregorian calendar. Romania adopted the Gregorian in 1919, with 31 March 1919 being followed by 14 April 1919. The last country of Eastern Orthodox Europe to adopt the Gregorian calendar for secular purposes was Greece, at the time under military administration ...

  8. 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 ...

  9. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The term Julian date may also refer, outside of astronomy, to the day-of-year number (more properly, the ordinal date) in the Gregorian calendar, especially in computer programming, the military and the food industry, [10] or it may refer to dates in the Julian calendar. For example, if a given "Julian date" is "October 5, 1582", this means ...