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  2. 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 ...

  3. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2019) and, before that, it was defined in ISO (R) 2015 since 1971. It is used (mainly) in government and business for fiscal years ...

  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. Turkish months - Wikipedia

    en.wikipedia.org/wiki/Turkish_months

    Turkey has used Gregorian AD year numbering officially since 1926, though Gregorian calendar dates were in use since March 1917. The names of the months from February to September had been used in the now abandoned Rumi calendar, with the other four still retaining their old Arabic/Aramaic names. In 1945, four of them received names of Turkish ...

  6. Week - Wikipedia

    en.wikipedia.org/wiki/Week

    1 Gregorian calendar year = 52 weeks + 1 day (2 days in a leap year) 1 week = 1600 ⁄ 6957 ≈ 22.9984% of an average Gregorian month In a Gregorian mean year, there are 365.2425 days, and thus exactly 52 + 71 ⁄ 400 or 52.1775 weeks (unlike the Julian year of 365.25 days or 52 + 5 ⁄ 28 ≈ 52.1786 weeks, which cannot be represented by a ...

  7. 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]

  8. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Lunar Hijri calendar is a lunar calendar consisting of 12 months in a year of 354 or 355 days. The astronomer's mean tropical year, which is averaged over equinoxes and solstices, is currently 365.24219 days, slightly shorter than the average length of the year in most calendars. A year can also be measured by starting on any other named ...

  9. 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 ...