源文出处：http://blog.163.com/li_hai_quan/blog/static/3953973920081150315696/
CTime==>CString
CTime time;
time.GetCurrentTime();
CString str;
str.Format("%s",time.Format("%y:%m:%d %H-%M-%S")
1
CString str;
CTime t = CTime::GetCurrentTime();
str.Format("%d-%d-%d",t.GetYear(),t.GetMonth(),t.GetDay());
2
CString strTime;
CTime tTime = CTime::GetCurrentTime();
strTime = tTime.Format("%Y-%m-%d %H:%M:%S");
CString ==>CTime
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
时间差
COleDateTime strFirst,strEnd;
strFirst = COleDateTime(strFirst.GetYear(),strFirst.GetMonth(),strFirst.GetDay(),0,0,0);
strEnd = COleDateTime(tmCurrent.GetYear(),tmCurrent.GetMonth(),tmCurrent.GetDay(),23,59,59);
tspan= strEnd - strFirst;
注：两个时间相减时，小时数不足24小时的，自动略去，不做一天计算。如7.1号 5点与7.2号3点间，就不能计算为一天。想要得出结果为一天的，要注意小时的赋值！！