You are given the following information, but you may prefer to do some research for yourself.
- 1 Jan 1900 was a Monday.
- Thirty days has September,
April, June and November.
All the rest have thirty-one,
Saving February alone,
Which has twenty-eight, rain or shine.
And on leap years, twenty-nine. - A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.
How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?
从1901-1-1到2000-12-31,一共有多少个星期天在每月的1号?
本文探讨了如何计算从1901年1月1日至2000年12月31日间,每个月的第一天落在星期天的次数。涉及日期计算规则,包括平年与闰年的区分。
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