计算两段时间的时间差 在写程序时,很多时候都要用到两个给定时间的时间差,所以特地把这个函数写出来以便以后可以方便的调用:-' Calculation of two one-hour time difference' in the writing process, they often have to use two given time the time difference, I' ve written this function in order to facil