建立具有下列功能的类Date：

a) 以多种格式输出日期，如

DDD YYYY

MM/DD/YYYY

June l4,1992

b) 用重载的构造函数初始化Date类的对象。初始化值是a)中格式的数据。

c) 构造函数用头文件time.h中的标准库函数读取系统的时间，把读取的时间赋给Date的数据成员。

　-Established the following functional classes Date: a) the date output in multiple formats, such as DDD YYYY MM/DD/YYYY June l4, 1992 b) Heavy Load Date class constructor initializes the object. Initialization value is a) in the format of data. c) constructor with the header file time.h in the standard library functions to read system time and the time to read the data members assigned to Date.