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There is no year 0 in either the Gregorian calendar or the Julian calendar. The year 1 BC immediately precedes AD 1. Historians adopted this convention after it was first used by Bede in his Historia Ecclesiastica Gentis Anglorum (Ecclesiastical History of the English People, 731). In book 1 compare chapters 1 and 3. He did not use a year zero because the counting numbers used to number years begin with one, not zero. Nevertheless, he was well aware of zero as a number because zero was the first epact of the nineteen-year cycle used to calculate the date of Easter as he explained in his De Temporum Ratione (On the Reckoning of Time, 725). The Latin word nullae meaning "nothing" was used for this zero epact, whereas all other epacts were numbered via Roman numerals.

Confusion over year 0 versus 1, and a preference for anniversaries in "round" figures, led to the celebration of the new millennium both in 2000 and 2001.

Year 0 is used in astronomical year numbering and is equivalent to 1 BC in the Gregorian or Julian calendars. Its first use is traditionally attributed to Jacques CassiniJacques Cassini ( February 8, 1677 April 18, 1756) was a French astronomer, son of Giovanni Domenico Cassini Cassini was born at the Paris Observatory. Admitted at the age of seventeen to membership of the French Academy of Sciences, he was elected in 169 in his Tables astronomiques (Astronomical Tables, 1740Events May 31 Friedrich II comes to power in Prussia upon the death of his father, Friedrich Wilhelm I. October 20 Maria Theresia of Austria inherits the Habsburg hereditary dominions ( Austria, Bohemia, Hungary and present-day Belgium). However, her succ) wherein he explained his reasons for doing so. But Phillipe de La HirePhilippe de la Hire (or Lahire or Phillipe de La Hire , French mathematician and astronomer, was born in Paris on March 18, 1640, and died there on April 21, 1719. He wrote on graphical methods, 1673; on the conic sections, 1685; a treatise on epicycloids had used it earlier in 1702Events March 8 William III died; Princess Anne Stuart becomes Queen Anne of England, Scotland and Ireland. March 11 The first regular English language newspaper, The Daily Courant''. is published for the first time. May 4/ 14 The War of the Spanish Succes in his Tabulæ Astronomicæ (Astronomical Tables) in the form Christum o. (Christ 0), without explanation.

All eras used with Hindu calendarThe Hindu calendar used in Vedic times has undergone many changes in the process of regionalization, and today there are several regional Indian calendars . Mostly, these are inherited from a system first enunciated in Jyotish Vedanga (one of the six adjus, such as the Saka era, begin with a year zero because all of these calendars use elapsed, expired, or complete years, in contrast with most other calendars which use current years. A complete year had not yet elapsed for any date in the year beginning at the epoch, thus that could not be year one—instead, it was year zero.

Many MayaThis article is about the pre-Columbian Maya civilization. See Maya people for a discussion of the modern Maya. The Maya are a people of southern Mexico and northern Central America with some 3,000 years of rich history. The Maya were part of the Mesoamer scholars, but not all, assume (or used to assume) that a year zero exists in the modern calendar and thus specify that the epoch of the Long CountThe Maya Long Count Calendar is a subset of the Maya calendar used by the Pre-Columbian Maya civilization. Dates are nearly all counted forward from a point in time dated 4 Ahau 8 Cumhu in a 52 year cycle. These dates are from the Calendar Round, a method of the Maya calendar occurred in 3113 BC rather than 3114 BC.