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A year zero does not exist in the Anno Domini (AD) calendar year system commonly used to number years in the Gregorian calendar (nor in its predecessor, the Julian calendar); in this system, the year 1 BC is followed directly by year AD 1 (which is the year of the epoch of the era).
For Hijri years since 1297 AH (1879/1881 CE), the Gregorian date of 1 Muharram, the first day of the year in the Islamic calendar, is given. The first Hijri year (AH 1) was retrospectively considered to have begun on the Julian calendar date 15 July 622 (known as the 'astronomical' or 'Thursday' epoch, Julian day 1,948,439) or 16 July 622 (the ...
calendar:setYear( year) - sets the year value for the calendar. year can be a number or a string. calendar:setYearRange( startYear, endYear) - sets the year value for the calendar as a year range. Both startYear and endYear must be number values. calendar:export() - exports the calendar to wikitext.
The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1] It has a length of 365 days in an ordinary year but, in order to reconcile the calendar year with the astronomical cycle, it has 366 days in a leap year. With 97 leap years every 400 years, the Gregorian calendar ...
Ancient calendars (static) may always have been annual, even after the length of the calendar year was fixed at (avg.) 365.25 days by the Julian Calendar (46 BC). Early Romans observed an 8-day market week, called the nundinal cycle, until the seven-day week was adopted during the reign of Emperor Constantine the Great (306-337).
Within these tables, January 1 is always the first day of the 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 backward from October 15, 1582.
The year begins with the first sight of Spring.In the Julian calendar, the vernal equinox moved gradually away from 21 March.The Gregorian calendar reform restored the vernal equinox to its original date, but since the festival was by now tied to the date, not the astronomical event, Kha b-Nisan remains fixed at 21 March in the Julian reckoning, corresponding to 1 April in the Gregorian calendar.
Errors applying leap years in the Julian Calendar affect parts of this 1-to-9 timespan. As a result, sources differ as to whether, for example, AD 1 was a common year starting on Saturday or Sunday. It was a common year starting on Saturday by the proleptic Julian calendar, and a common year starting on Monday by the proleptic Gregorian calendar.