Anno Mundi

Anno Mundi

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(Latin: "in the year of the world") abbreviated as AM or A.M., refers to a Calendar era counting from the Biblical creation of the world.

Jewish computation

Years in the Hebrew calendar are counted from the Creation year. The system in use today was adopted sometime before 3925 AM (165 CE), and based on the calculation in the Seder Olam Rabbah of Rabbi Yose Ben Halafta in about 160 CE.^[1] By his calculation first humans were created in the year 3761 BCE.^[2] The Jewish year spanning 2007?2008 CE, after Rosh Hashanah, is 5768 AM in the Hebrew calendar.

AM was also used by early Christian chronographers. The medieval historian Bede dated creation to 18 March 3952 BCE. The Chronicon of Eusebius and Jerome dated creation to the year of 5199 BCE.^[3]^[4] Earlier editions of the Roman Martyrology for Christmas Day used this date,^[5] as did the Irish Annals of the Four Masters.^[6]

The Etos Kosmou is the corresponding concept in the Byzantine calendar, which dates creation to 1 September 5509 BCE.

Related to this is the Anno Lucis of the Masonic era, which adds 4000 years to the CE date,^[7] and the Julian day number, counting the days that have elapsed since noon Greenwich Mean Time (UT or TT) on Monday, 1 January 4713 BCE.

Mattis, Kantor, The Jewish time line encyclopedia: a year-by-year history from Creation to present, Jason Aronson Inc., Northvale, N.J., 1992