Năm 1980 có bao nhiêu ngày Chủ Nhật

6/1/1980 13/1/1980 20/1/1980 27/1/1980 3/2/1980 10/2/1980 17/2/1980 24/2/1980 2/3/1980 9/3/1980 16/3/1980 23/3/1980 30/3/1980 6/4/1980 13/4/1980 20/4/1980 27/4/1980 4/5/1980 11/5/1980 18/5/1980 25/5/1980 1/6/1980 8/6/1980 15/6/1980 22/6/1980 29/6/1980 6/7/1980 13/7/1980 20/7/1980 27/7/1980 3/8/1980 10/8/1980 17/8/1980 24/8/1980 31/8/1980 7/9/1980 14/9/1980 21/9/1980 28/9/1980 5/10/1980 12/10/1980 19/10/1980 26/10/1980 2/11/1980 9/11/1980 16/11/1980 23/11/1980 30/11/1980 7/12/1980 14/12/1980 21/12/1980 28/12/1980