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Learn about the origins and evolution of various calendar systems from prehistory to the present. Compare different methods of timekeeping, cultural and practical purposes, and astronomical and agricultural connections.
A comprehensive list of historical and proposed calendars, grouped by type (solar, lunisolar, lunar, seasonal) and cultural or historical context. Learn about the origins, features and usage of different calendars, such as the Hebrew, Egyptian, Mayan, Gregorian and more.
Learn about the calendar changes in Europe and the British Empire from Julian to Gregorian system, and the start-of-year adjustments from 25 March to 1 January. Find out how to use O.S. and N.S. notation for historical dates and events.
The Gregorian calendar is the calendar used in most parts of the world since October 1582. It has a different rule for leap years than the Julian calendar and was introduced to align the calendar with the solar year and the date of Easter.
A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. Learn about different eras used in ancient and modern history, such as the Seleucid era, the Olympiad, and the Common Era (CE).
The Gregorian calendar was decreed by Pope Gregory XIII in 1582 to correct the error in the Julian calendar that affected the date of Easter. Some Catholic countries ...
This web page lists various dates that are not used on the Gregorian calendar, such as February 30, January 0, and December 32. It also includes some fictional and historical examples of non-standard dates, such as June 31 in the Soviet film 31 June.
The International Fixed Calendar is a proposed reform of the Gregorian calendar with 13 months of 28 days each. The 13th month is called Sol and inserted between June and July, and the extra day is called Year Day or Leap Day.