Summer of 779. 26 A.D.
Jan.-Feb., 780 A.D. 27
Feb.-April, 780. A.D. 27
Passover, April 11-18, 780. A.D. 27
Dec., 780-March, 781. A.D. 27-28
Passover, March 30-April 5, 781. A.D. 28.