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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".
The Gregorian calendar is the calendar used in most parts of the world. [1] [a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.
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).
This is a list of Hijri years (Latin: anno Hegirae or AH) with the corresponding common era years where applicable. 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.
Gregorian calendar: 1445 MCDXLV: ... Year 1445 was a common year ... This page was last edited on 3 January 2025, at 12:58 (UTC).
Japan started using the Gregorian calendar on 1 January 1873, [8] locally known as "the first day of the first month of Meiji 6" (明治6年1月1日, Meiji rokunen ichigatsu tsuitachi). The preceding day, 31 December 1872, was "the second day of the twelfth month of Meiji 5" ( 明治5年12月2日 , Meiji gonen jūnigatsu futsuka ) .
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