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  2. 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 .

  3. Adoption of the Gregorian calendar - Wikipedia

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

    This numbering was informally used with the Korean lunar calendar before 1945 but is only occasionally used today. 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.

  4. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  5. Why do we have Leap Year? A guide to the calendar's bonus day

    www.aol.com/why-leap-guide-calendars-bonus...

    There are typically 365 days in a year, but in 2024 we get 366. Here's the history behind February's bonus day. ... It worked so well that most of the world still uses the Gregorian calendar today.

  6. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The Sumerian calendar was the next earliest, followed by the Egyptian, Assyrian and Elamite calendars. The Vikram Samvat has been used by Hindus and Sikhs. One of several regional Hindu calendars in use on the Indian subcontinent, it is based on twelve synodic lunar months and 365 solar days.

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

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

    Previously used the Japanese calendar. Japanese era names still remain in use. Laos: French colonial empire: 1889 N/A Previously used the Burmese calendar. Latvia: Courland: 1617 10 [12] [21] [22] Latvia Courland: 1796 7 Feb 28 Jan -11 Return to the Julian calendar [12] [21] Latvia Courland: 1915 11 May 25 May 13 Latvia Livland: 1915 22 Aug 5 ...