Editing Era (section)

===Calendar eras===
{{main|Calendar era}}
Calendar eras count the years since a particular date (epoch), often one with religious significance.  ''[[Anno mundi]]'' (year of the world) refers to a group of calendar eras based on a [[Dating creation|calculation of the age of the world]], assuming it was created as described in the [[Book of Genesis]].<ref>{{Cite web |title=Anno mundi {{!}} Jewish Calendar, History & Origins {{!}} Britannica |url=https://www.britannica.com/topic/anno-mundi |access-date=2023-12-11 |website=www.britannica.com |language=en}}</ref> In Jewish religious contexts one of the versions is still used, and many [[Eastern Orthodox]] religious calendars used another version until 1728.  Hebrew year 5772 AM began at sunset on 28 September 2011<ref>{{Cite web |title=Hebrew Date Converter - September 28, 2011 after sunset / 1st of Tishrei, 5772 |url=https://www.hebcal.com/converter?gd=28&gm=9&gy=2011&gs=on&g2h=1 |access-date=2023-12-11 |website=www.hebcal.com}}</ref> and ended on 16 September 2012.<ref>{{Cite web |title=Hebrew Date Converter - September 16, 2012 after sunset / 1st of Tishrei, 5773 |url=https://www.hebcal.com/converter?gd=16&gm=9&gy=2012&gs=on&g2h=1 |access-date=2023-12-11 |website=www.hebcal.com}}</ref>  In the Western church, ''[[Anno Domini]]'' (''AD'' also written ''[[Common era|CE]]''), counting the years since the birth of Jesus on traditional calculations, was always dominant.<ref>{{Cite web |title=Chronology - Christian History, Dates, Events {{!}} Britannica |url=https://www.britannica.com/topic/chronology/Christian |access-date=2023-12-11 |website=www.britannica.com |language=en}}</ref>

The [[Islamic calendar]], which also has variants, counts years from the [[Hijra (Islam)|Hijra]] or emigration of the Islamic prophet [[Muhammad]] from [[Mecca]] to [[Medina]], which occurred in 622 AD.<ref>{{Cite web |date=2023-11-14 |title=Islamic calendar {{!}} Months, Definition, & Facts {{!}} Britannica |url=https://www.britannica.com/topic/Islamic-calendar |access-date=2023-12-11 |website=www.britannica.com |language=en}}</ref>  The Islamic year is some days shorter than 365; January 2012 fell in 1433 AH ("After Hijra").<ref>{{Cite web |title=Hijri to Gregorian Date Converter - Islamic Date Converter |url=https://www.islamicfinder.org/islamic-date-converter/ |access-date=2023-12-11 |website=IslamicFinder |language=en}}</ref>

For a time ranging from 1872 to the [[World War II|Second World War]], the Japanese used the imperial year system (''kōki''),<ref>{{Cite book |last=Louis-Frédéric |url=https://books.google.com/books?id=p2QnPijAEmEC&pg=PA514 |title=Japan Encyclopedia |date=2002 |publisher=Harvard University Press |isbn=978-0-674-01753-5 |language=en}}</ref> counting from the year when the legendary [[Emperor Jimmu]] founded Japan, which occurred in 660 BC.<ref>Gubbins, John Harrington. (1922). [https://books.google.com/books?id=0MwNAAAAIAAJ&pg=PA71 ''The Making of Modern Japan,'' p. 71]; Mossman, Samuel. (1873). [https://books.google.com/books?id=ryEPAAAAYAAJ&pg=PA462 ''New Japan, the Land of the Rising Sun,'' p. 462].</ref>

Many [[Buddhist calendar]]s count from the death of the [[Buddha]], which according to the most commonly used calculations was in 545–543 BCE or 483 BCE.<ref name=":1">{{Cite web |title=Calendar systems and their role in patent documentation {{!}} Epo.org |url=https://www.epo.org/en/searching-for-patents/helpful-resources/patent-knowledge-news/calendar-systems-and-their-role-1#:~:text=In%20Thailand,%20Cambodia%20and%20Laos,and%20Myanmar%20to%20544%20BC. |access-date=2023-12-11 |website=www.epo.org}}</ref> Dates are given as "BE" for "Buddhist Era"; 2000 AD was 2543 BE in the [[Thai solar calendar]].<ref name=":1" />

Other calendar eras of the past counted from political events, such as the [[Seleucid era]]<ref>Denis C. Feeney, ''Caesar's Calendar,'' [[University of California Press]], Berkeley 2007, p. 139.</ref> and the Ancient Roman ''[[ab urbe condita]]'' ("AUC"), counting from the foundation of the city.<ref name=":2">Wiseman, Timothy Peter (1995). ''Remus: A Roman Myth''. Cambridge University Press. {{ISBN|978-0-521-48366-7}}.</ref>