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  Gregorian calendar

  The Gregorian calendar is the internationally accepted civil calendar. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom the calendar was named, on 24 February 1582 by the papal bull Inter gravissimas. It was adopted later that year by a...
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  Hebrew calendar

  The Hebrew calendar (Hebrew: הלוח העברי‎ ha'luach ha'ivri) or Jewish calendar is a lunisolar calendar used by Jews, and in recent decades, by a growing number of Christians. Today, the calendar is predominantly used for religious observances, but is also employed by Jewish farmers in Israel as an...
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  Islamic calendar

  The Islamic calendar or Muslim calendar or Hijri calendar (Arabic: التقويم الهجري‎; at-taqwīm al-hijrī; Persian: تقویم هجری قمری ‎ taqwīm-e hejri-ye qamari; Turkish: Hicri Takvim) is a lunar calendar based on 12 lunar months in a year of 354 or 355 days, used to date events in many Muslim countries...
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  Julian calendar

  The Julian calendar, a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC, and came into force in 45 BC (709 ab urbe condita). It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year, known at least...
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  Roman calendar

  The Roman calendar changed its form several times in the time between the foundation of Rome and the fall of the Roman Empire. This article generally discusses the early Roman or 'pre-Julian' calendars. The calendar used after 46 BC is discussed under Julian calendar. The original Roman calendar is...
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  Iranian calendar

  The Iranian calendar (Persian: گاهشماری ایرانی‌ Gahshomari-ye Irani) can refer to any in a succession of a set of calendars. They are used for over two millennia in Iran (Persia), Afghanistan and related societies. The current official Iranian calendar begins on the vernal equinox as determined by...
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  Mayan calendar

  The Maya calendar is a system of distinct calendars and almanacs used by the Maya civilization of pre-Columbian Mesoamerica, and by some modern Maya communities in highland Guatemala. These calendars can be synchronized and interlocked, their combinations giving rise to further, more extensive...
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  Aztec calendar

  The Aztec calendar, is the calendar system that was used by the Aztecs as well as other Pre-Columbian peoples of central Mexico. It is one of the Mesoamerican calendars, sharing the basic structure of calendars from throughout ancient Mesoamerica. The calendar consisted of a 365-day calendar cycle...
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  Japanese calendar

  On January 1, 1873, Japan adopted the Gregorian calendar, with local names for the months and mostly fixed holidays, but before 1873, a lunisolar calendar was in use, which was adapted from the Chinese calendar. Japanese eras are still in use. Since the adoption of the Gregorian calendar, three...
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  Calendar of saints

  The calendar of saints is a traditional Christian method of organizing a liturgical year by associating each day with one or more saints and referring to the day as that saint's feast day. The system arose from the very early Christian custom of annual commemoration of martyrs on the dates of their...