vc 字符串转时间，并取时间差

来自：http://topic.csdn.net/u/20110119/04/472c9e3f-d711-46a7-a3a0-91eedb679256.html 

CString stime = "2011-01-18 14:42:08";  
COleDateTime CurrTime = COleDateTime::GetCurrentTime();  
COleDateTime tempTime;  
tempTime.ParseDateTime(stime);  

COleDateTimeSpan result = CurrTime - tempTime;