仿照日期类编写时间类CTime_t,可以完成时间的设置、运算、比较等功能。

增加时间的输入功能，既可以选择输入格式，可以输入hh：mm：ss格式的信息。

增加时间的输出格式，可以输出12小时的时间格式。编写时间和日期的派生类CDati，完成日期与时间的联合设置、运算、比较等功能，要求该派生类可以完成：日期时间加天数或时间等于新的日期时间，日期时间减天数或等于新的日期时间，两个日期时间相减等于天数或时间等工作，在程序中考虑闰年等具体情况，并重载各种运算符。-Date of class preparation time along the lines of class CTime_t, you can complete the time setting, computing, comparing and so on.

Increase the time of the input function, which can select the input format, you can enter hh: mm: ss format information.

Increase the time of the output format, you can output 12-hour time format. Time and date of writing derived classes CDati, completion date and

Time of the joint set, operation, comparison functions, require that derived classes can be completed: date time plus time equals the number of days or a new

Date, time, date and time minus the number of days equal to the new date or time, subtract two date time is equal to the number of days or hours, etc., in

Process to consider the specific circumstances of such a leap year, and a variety of operator overloading.