1.给定某个日期，能计算出距指定基础日期（由老师指定）的天数和星期几；

2.给定距指定基础日期（由老师指定）的天数，能计算出具体的日期和星期几；

3.应区分平年和闰年，区分大月和小月，区分2月是28天还是29天。

-1 Given a date, can be calculated from the specified base date (by the teacher specify) the number of days and days of the week　2 given at the specified base date (by the teacher specify) the number of days, can calculate the exact date and day of week few　3. should distinguish non-leap year and leap year, month, and Satsuki big distinction, the distinction between February is 28 days or 29 days.