Anno Mundi (Latin: "in the year of the world"), abbreviated as AM or A.M., refers to a Calendar era based on the Biblical creation of the world. Numerous efforts have been made to determine the Biblical date of Creation, yielding varying results. Besides differences in interpretation, which version of the Bible is being referenced also impacts on the result. (see Dating creation)
The Hebrew calendar era is used within the Jewish communities for religious and other purposes; and the Byzantine calendar has been in general use at one time in the Orthodox Churches and several Eastern European countries.