通常我们只知道生活当天的前后几天是星期几，即便是翻日历，也只能知道有限日期的星期数。那么有没有一种方法可以让我们知道任何一天是星期几呢？有，下面我将向大家介绍一种方法，用以编写万年历的程序。-Normally, we only know a few days of life before and after the day of the week, even over the calendar, the date can only know a limited number of weeks. So Is there a way to let us know any day this week? Yes, I will tell you a method for the preparation of calendar procedures.