Anno Mundi
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Anno Mundi (AM, "in the year of the world") refers to a Calendar era counting from the creation of the world. An example is the Hebrew calendar which considers creation to have taken place in the year 3760 BC. This is based upon the Seder Olam Rabbah of Rabbi Yose Ben Halafta in the second century AD. The year 2007 CE, before Rosh Hashanah, is 5767 AM in the Hebrew calendar.
AM was also used by early Christian chronographers. The medieval historian Bede dated creation to 18 March 3952 BC.
The Aetos Kosmou is the corresponding concept in the Byzantine Greek Calendar, which dates creation to 1 September 5509 BC.
James Ussher (1654) dated creation to 23 October 4004 BC.
Related to this is the Anno Lucis of Freemasonry, which adds 4000 years to the AD date; and the Julian day number, counting the days that have elapsed since noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC.
The date inferred from the Roman Martyrology[1] is 25 March 5198 BC.