Năm 1997 có bao nhiêu ngày Thứ 7

4/1/1997 11/1/1997 18/1/1997 25/1/1997 1/2/1997 8/2/1997 15/2/1997 22/2/1997 1/3/1997 8/3/1997 15/3/1997 22/3/1997 29/3/1997 5/4/1997 12/4/1997 19/4/1997 26/4/1997 3/5/1997 10/5/1997 17/5/1997 24/5/1997 31/5/1997 7/6/1997 14/6/1997 21/6/1997 28/6/1997 5/7/1997 12/7/1997 19/7/1997 26/7/1997 2/8/1997 9/8/1997 16/8/1997 23/8/1997 30/8/1997 6/9/1997 13/9/1997 20/9/1997 27/9/1997 4/10/1997 11/10/1997 18/10/1997 25/10/1997 1/11/1997 8/11/1997 15/11/1997 22/11/1997 29/11/1997 6/12/1997 13/12/1997 20/12/1997 27/12/1997