COleDateTime,、CTime--->CString
這個方法很簡單，用Format格式化一個字符串就可以了,，詳見MSDN

CString--->COleDateTime:

方法1：COleDateTime::ParseDateTime()

CString strDate = _T("1987-06-21");
COleDateTime oleDate;
oleDate.ParseDateTime(strDate, VAR_DATEVALUEONLY);

方法2：COleVariant

CString strDate = _T("1987-06-21");
COleVariant varTime(strDate);
varTime.ChangeType(VT_DATE);
COleDateTime oleDate(varTime);
//COleDateTime oleDate;
//oleDate=varTime;

COleDateTime--->CTime:

方法1：用COleDateTime::GetAsSystemTime(SYSTEMTIME& sysTime)

COleDateTime oleDate(1987, 6, 21, 0, 0, 0);
SYSTEMTIME sysTime;
oleDate.GetAsSystemTime(sysTime);
CTime tm(sysTime);

方法2：用VariantTimeToSystemTime函數(shù)
COleDateTime--->SYSTEMTIME--->CTime

COleDateTime oleDate(1987, 6, 21, 0, 0, 0);
SYSTEMTIME sysTime;
VariantTimeToSystemTime(oleDate, &sysTime);
CTime tm(sysTime);

CTime--->COleDateTime:

方法1：用CTime::GetTime()得到time_t

CTime time(1987, 6, 21, 0, 0, 0);
time_t tm = time.GetTime();
COleDateTime oleTime(tm);

方法2：用COleDateTime::GetAsSystemTime(SYSTEMTIME& sysTime)

CTime time(1987, 6, 21, 0, 0, 0);
SYSTEMTIME   sysTime;
time.GetAsSystemTime(sysTime);
COleDateTime oleTime(sysTime);
//COleDateTime oleTime;
//oleTime=sysTime;