关于时间的类型转换

strCString= "2003-10-27   6:24:37 ";   //CString---> COleDateTime 
COleVariant   vtime(strCString); 
vtime.ChangeType(VT_DATE); 
COleDateTime   time4=vtime; 

COleDateTime   time1(1977,4,16,2,2,2);   //COleDataTime---> CTime 
SYSTEMTIME   systime; 
VariantTimeToSystemTime(time1,   &systime); 
CTime   tm(systime); 

time_t   time2=tm.GetTime();   //CTime---> time_t 
COleDateTime   time3(time2);   //time_t---> COleDateTime