文件名称:countdate
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function1：计算两日期的天数差。function2从某个日期开始过n天后对应的时间。function3查询某日期是星期几。-input a date.
than:
function1:count days between two date.
function2:check out what s the date after a few days.
function3:check out what s the day of a week.
than:
function1:count days between two date.
function2:check out what s the date after a few days.
function3:check out what s the day of a week.
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countdate.cpp