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

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

    This is a list of adoption dates of the Gregorian calendar by country.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.

  3. File:Reforma Gregoriana del Calendario Juliano.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Reforma_Gregoriana...

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  4. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people (also known as the Berbers).

  5. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    Memorial plaque to John Etty in All Saints' Church, North Street, York, recording his date of death as "28 of Jan: ⁠170 + 8 / 9 ⁠ ". In the Kingdom of Great Britain and its possessions, the Calendar (New Style) Act 1750 introduced two concurrent changes to the calendar.

  6. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/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.

  7. Revised Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Revised_Julian_calendar

    The Revised Julian calendar, or less formally the new calendar and also known as the Milanković calendar, is a calendar proposed in 1923 by the Serbian scientist Milutin Milanković as a more accurate alternative to both Julian and Gregorian calendars.

  8. Proleptic Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Proleptic_Gregorian_calendar

    The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. In nations that adopted the Gregorian calendar after its official and first introduction, dates occurring in the interim period of 15 October 1582 (the first date of use of Gregorian calendrical dates, being dated 5 October 1582 in the preceding ...

  9. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Breguet classique Grand complication perpetual calendar. Offices and retail establishments often display devices containing a set of elements to form all possible numbers from 1 through 31, as well as the names/abbreviations for the months and the days of the week, to show the current date for convenience of people who might be signing and dating documents such as checks.