确实，对于一个给定的日期，每年属于哪个星期几总是后移一天，闰年除外，后移两天。
Indeed, the day of the week for a given date progresses by one annually, except on leap years, where it progresses by two.
2月3日是公历一年中的第34天，离全年结束还有331天(闰年是332天)。
February 3 is the 34th day of the year in the Gregorian calendar. There are 331 days remaining until the end of the year (332 in leap years).
1月21日是阳历年的第21天，离一年的结束还有344天(闰年是345天)。
January 21 is the 21st day of the year in the Gregorian calendar. There are 344 days remaining until the end of the year (345 in leap years).
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