Năm 1977 có bao nhiêu ngày Thứ 7

1/1/1977 8/1/1977 15/1/1977 22/1/1977 29/1/1977 5/2/1977 12/2/1977 19/2/1977 26/2/1977 5/3/1977 12/3/1977 19/3/1977 26/3/1977 2/4/1977 9/4/1977 16/4/1977 23/4/1977 30/4/1977 7/5/1977 14/5/1977 21/5/1977 28/5/1977 4/6/1977 11/6/1977 18/6/1977 25/6/1977 2/7/1977 9/7/1977 16/7/1977 23/7/1977 30/7/1977 6/8/1977 13/8/1977 20/8/1977 27/8/1977 3/9/1977 10/9/1977 17/9/1977 24/9/1977 1/10/1977 8/10/1977 15/10/1977 22/10/1977 29/10/1977 5/11/1977 12/11/1977 19/11/1977 26/11/1977 3/12/1977 10/12/1977 17/12/1977 24/12/1977 31/12/1977