该程序可实现计算将来或过去某一天是星期几，只要确定某一天是星期一，再输入一个未知时间，运行后就能确定出未知时间是星期几。-The program enables calculation of the future or the past week on a certain day, as long as Monday to determine if a day, and then enter an unknown time, running time will be able to determ