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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.
Islamic calendar stamp issued at King Khalid International Airport on 10 Rajab 1428 AH (24 July 2007 CE). The Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), or Arabic calendar, also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days.
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.
6 December [9] 1433 AH: Sun Nov 27, 2011 (Close to the Solar eclipse of November 25, 2011) 26 November [10] 1434 AH: Thu/Fri 14/15 Nov 2012 (Close to the Solar eclipse of November 13, 2012) 15 November [11] 1435 AH: Mon/Tue 4/5 Nov 2013 (Close to the Solar eclipse of November 3, 2013) 1436 AH
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 ...
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".
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).
The Islamic calendar is a purely lunar calendar, and months begin when the first crescent of a new moon is sighted. Since the Islamic lunar year is 11 to 12 days shorter than the solar year, Jumada al-Thani migrates throughout the seasons.