It is important to remember that the various eras do not exactly correspond with each other. Thus it is generally said that the year of Rome A.U.C. 754 agrees with A.D. I; but it will be seen by the following that this is not always true, for any date in January, February, or March, A.D. I, would be in A.U.C. 753, and not 754, so that in some cases the corresponding of the two eras will appear to be a year out. But for all ordinary purposes we say A.U.C. 754= A.D. I. The years A.U.C. can be turned into the years B.C. by deducting the year A.U.C. from 754; thus A.U.C. 726 agrees with B.C. 28, because 754-726 = 28. In like manner, to find the year A.D., deduct 753 from the year A.U.C. thus A.U.C. 783 agrees with A.D. 30, because 783-753 = 30. We say Olympiad 195-1= A.D. 1.
January, B.C. 1 February March April May June July August September October November December
Olympiads.
A.U.C.
Julian Period
4713
April 21
753
194-4
January, A.D. I February March April May June July August September October November December
4714
April 21
754
195—I
A.D. 2