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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).
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. Years are given in astronomical year numbering.
For dates before the year 1, unlike the proleptic Gregorian calendar used in the international standard ISO 8601, the traditional proleptic Gregorian calendar (like the older Julian calendar) does not have a year 0 and instead uses the ordinal numbers 1, 2, ... both for years AD and BC. Thus the traditional time line is 2 BC, 1 BC, AD 1, and AD 2.
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".
To reduce misunderstandings about the date, it was normal even in semi-official documents such as parish registers to place a statutory new-year heading after 24 March (for example "1661") and another heading from the end of the following December, 1661/62, a form of dual dating to indicate that in the following twelve weeks or so, the year was ...
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.
The rule is that if the year is divisible by 100 and not divisible by 400, the leap year is skipped. The year 2000 was a leap year, for example, but the years 1700, 1800, and 1900 were not.
The first day of Ramadan from 1357–1460 Hijri / 1938–2038 Gregorian [a] [1] Gregorian Hijri Gregorian Hijri Gregorian Hijri Gregorian Hijri 25 October 1938: 1357: 17 January 1964: 1383: 8 April 1989: 1409: 28 June 2014: 1435 15 October 1939: 1358: 6 January 1965: 1384: 28 March 1990: 1410: 18 June 2015: 1436 4 October 1940: 1359: 27 ...