1?DateTime.DaysInMonth ?//获取一个月的天数

Demo:

//获取最后一天

private DateTime?GetLastDayOfMonth(int Year, int Month)?
??????? {?
????????????//这里的关键就是 DateTime.DaysInMonth 获得一个月中的天数??????????
????????????? int Days = DateTime.DaysInMonth(Year, Month);?
??????????? return Convert.ToDateTime(Year.ToString() + "-" + Month.ToString() + "-" + Days.ToString());?
??????? }?

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2?DateTime.DayOfWeek//获取当月的第一天是星期几

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