说明：输入某年某月某日，返回这一天是星期几。程序具有容错性和健壮性。
Enter a certain period of a particular day, the return day of the week. The program has the fault tolerance and robustness.
输入某年某月某日，判断这一天是这一年的第几天？
Enter a certain day a year to determine the day of the year the first few days?
说明：题目：输入某年某月某日，判断这一天是这一年的第几天？
Title: Importation of a certain date, judgment day is this year 's first few days?
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