8 A.D.: The Sanhedrin reformed the old solar calendar of the Jews.

16. 8 A.D.: The Sanhedrin reformed the old solar calendar of the Jews.

Sunday, January 1, 45 B.C.: Julius Caesar began the new calendar.

As Julius Caesar was assassinated in 44 B.C., the Roman priests had the conference and they made a leap year every three years from 44 B.C. They had a leap year every three years from 44 B.C. until 9 B.C.