The Answer to the question is t
Answer: A monk called Dionysius Exiguous calculated his own present year to be A.D. 525. Counting from that year reaches the current year. A.D. is now used to label the number of years in the Gregorian calendar, the most widely used calendar in the world and the unofficial global standard. You add one year every January 1.
Explanation:
Christianity because it still held some of the strong beliefs of Judaism, the only real difference is the belief that Jesus is the Messiah
