proleptic year

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• Proleptic Gregorian calendar — The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to dates preceding its official introduction in 1582. It has been defined in the international standard ISO 8601.Most Maya scholars use the Gregorian… …   Wikipedia

• Proleptic Julian calendar — The proleptic Julian calendar is produced by extending the Julian calendar to dates preceding AD 4 when its quadrennial leap year stabilized. The leap years actually observed between its official implementation in 45 BC and AD 4 were erratic, see …   Wikipedia

• Year zero — There is no year zero in the widely used Gregorian calendar, nor in its predecessor, the Julian calendar. Under those systems, the year 1 BC is followed by AD 1. However, there is a year zero in astronomical year numbering (where it coincides… …   Wikipedia

• Leap year — A leap year (or intercalary year) is a year containing one or more extra days (or, in the case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. For example, in the… …   Wikipedia

• Julian day — JDN redirects here. For the military IT system, see Joint Data Network. For the comic book character Julian Gregory Day, see Calendar Man. Not to be confused with Julian year (disambiguation). Julian day is used in the Julian date (JD) system of… …   Wikipedia

• Gregorian calendar — For the calendar of religious holidays and periods, see Liturgical year. For this year s Gregorian calendar, see Common year starting on Saturday. 2011 in other calendars Gregorian calendar 2011 MMXI …   Wikipedia

• Doomsday rule — John Conway, inventor of the Doomsday algorithm The Doomsday rule or Doomsday algorithm is a way of calculating the day of the week of a given date. It provides a perpetual calendar since the Gregorian calendar moves in cycles of 400 years. This… …   Wikipedia

• Mesoamerican Long Count calendar — Long Count redirects here. For the 1927 boxing match, see The Long Count Fight. Detail showing three columns of glyphs from a portion of the 2nd century CE La Mojarra Stela 1. The left column gives a Long Count date of 8.5.16.9.7, or 156 CE. The… …   Wikipedia

• Julian calendar — The Julian calendar began in 45 BC (709 AUC) as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year (known at… …   Wikipedia

• ISO 8601 — Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date and time related data. It was issued by the International Organization for… …   Wikipedia

• Revised Julian calendar — The Revised Julian calendar, also known as the Rectified Julian calendar, or, less formally, New calendar, is a calendar, originated in 1923, which effectively discontinued the 340 years of divergence between the naming of dates sanctioned by… …   Wikipedia