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  2. 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 ...

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

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

    There are only four countries which have not adopted the Gregorian calendar for civil use: Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat and Nepal Sambat), Iran (Solar Hijri calendar) [1] and Afghanistan (Lunar Hijri Calendar). [2] Thailand has adopted the Gregorian calendar for days and months, but uses its own era for years: the ...

  4. Adoption of the Gregorian calendar - Wikipedia

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

    Some religious groups in some of these countries, known as Old Calendarists, still use the "old style" (O.S.) Julian calendar for ecclesiastical purposes. The Kingdom of Bulgaria changed from the Julian to the Gregorian calendar in 1916 during the First World War. 31 March was followed by 14 April 1916. [17]

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Perpetual Calendar Gregorian Calendar adoption dates for many countries. World records for mentally calculating the day of the week in the Gregorian Calendar ; The Calendar FAQ – Frequently Asked Questions about Calendars; Today's date (Gregorian) in over 800 more-or-less obscure foreign languages Archived 8 March 2023 at the Wayback Machine

  6. Civil calendar - Wikipedia

    en.wikipedia.org/wiki/Civil_calendar

    The most widespread civil calendar and de facto international standard is the Gregorian calendar. Although that calendar was first declared by Pope Gregory XIII to be used in Catholic countries in 1582, it has since been adopted, as a matter of convenience, by many secular and non-Christian countries although some countries use other calendars.

  7. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    A universal calendar, combining different calendars. A full calendar system has a different calendar date for every day. [20] [21] Thus the week cycle is by itself not a full calendar system; [22] neither is a system to name the days within a year without a system for identifying the years.

  8. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_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. The lunar year begins with the new moon of the month of Chaitra. This day, known as Chaitra Sukhladi, is a restricted (optional) holiday in India.

  9. Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Islamic_calendar

    Islamic calendar stamp issued at King Khalid International Airport on 10 Rajab 1428 AH (24 July 2007 CE). The Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), or Arabic calendar, also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days.