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Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering . Augustus corrected errors in the observance of leap years by omitting leap days until AD 8.
A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 February 2025" is ten days after "15 February 2025".
This can be negative and also can be in the format "n BC" to display BC dates or "AD n" as an alternative to a positive number. If not specified, the current year is used. footnotes Any footnotes to be placed at the bottom of the sidebar. gregcal Name of an article to be displayed for Gregorian and Julian years (e.g. "2000 BC").
The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.
National standard format is yyyy-mm-dd. [161] dd.mm.yyyy format is used in some places where it is required by EU regulations, for example for best-before dates on food [162] and on driver's licenses. d/m format is used casually, when the year is obvious from the context, and for date ranges, e.g. 28-31/8 for 28–31 August.
[2] [3] To accommodate the two calendar changes, writers used dual dating to identify a given day by giving its date according to both styles of dating. For countries such as Russia where no start-of-year adjustment took place, [a] O.S. and N.S. simply indicate the Julian and Gregorian dating systems respectively.
A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. [1] For example, the current year is numbered 2025 in the Gregorian calendar, which numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras).
1359) [3] February 19 – Leonor of Aragon, queen of Portugal (b. 1402) April 7 – Louis VIII, Duke of Bavaria, German noble (b. 1403) May 15 – Johanna van Polanen, Dutch noblewoman (b. 1392) June 5 – Leonel Power, English composer; July 15 – Joan Beaufort, Queen of Scotland [4] August 2 – Oswald von Wolkenstein, Austrian composer (b ...