The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. In...

invention or implementation is called the "proleptic" version of the calendar. Likewise, the proleptic Gregorian calendar is occasionally used to specify dates...

The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas...

The adoption of the Gregorian Calendar was an event in the early modern history of most cultures and societies, marking a change from their traditional...

3114 BCE in the proleptic Gregorian calendar. The Long Count calendar was widely used on monuments. The two most widely used calendars in pre-Columbian...

A proleptic calendar is a calendar that is applied to dates before its introduction. Examples include: Proleptic Gregorian calendar Proleptic Julian calendar...

equivalent to August 11, 3114 BC in the proleptic Gregorian calendar or September 6, in the Julian calendar (−3113 astronomical). The GMT correlation...

noon on Monday, January 1, 4713 BC, proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar), a date at which three multi-year...

year. The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon...

the proleptic Revised Julian calendar was behind the proleptic Gregorian calendar. The Revised Julian calendar is the same as the Gregorian calendar from...