你想知道某年某月某日是星期几吗?那么请用下面的公式 S=y-1+[(y-1)/4]-[(y-1)/100]+[(y-1)/400)+d (1)计算出S的值以后,再除以7。所得的余数r即为星期数(整除时为星期日)。公式(1)中的y为公元年数,d为该年从元旦计起到该日的天数(包括该日在内),记号[x]表示不超过x的最大整数,即[(y-1)/4]、[(y Do you want to know the day of the week for a particular month or year? Then use the formula S=y-1+[(y-1)/4]-[(y-1)/100]+[(y- 1)/400)+d (1) After calculating the value of S, divide it by 7. The remainder r is the number of weeks (Sunday divisible by division). In formula (1), y is the number of years in the AD, d is the number of days (including the day) from the New Year’s date to the day, and the symbol [x] represents the largest integer not exceeding x, ie, [(y-1) )/4], [(y