Năm 1987 có bao nhiêu ngày Thứ 7

3/1/1987 10/1/1987 17/1/1987 24/1/1987 31/1/1987 7/2/1987 14/2/1987 21/2/1987 28/2/1987 7/3/1987 14/3/1987 21/3/1987 28/3/1987 4/4/1987 11/4/1987 18/4/1987 25/4/1987 2/5/1987 9/5/1987 16/5/1987 23/5/1987 30/5/1987 6/6/1987 13/6/1987 20/6/1987 27/6/1987 4/7/1987 11/7/1987 18/7/1987 25/7/1987 1/8/1987 8/8/1987 15/8/1987 22/8/1987 29/8/1987 5/9/1987 12/9/1987 19/9/1987 26/9/1987 3/10/1987 10/10/1987 17/10/1987 24/10/1987 31/10/1987 7/11/1987 14/11/1987 21/11/1987 28/11/1987 5/12/1987 12/12/1987 19/12/1987 26/12/1987