CString、CTime和COleDateTime转换

COleDateTime、CTime--->CString
这个方法很简单，用Format格式化一个字符串就可以了，详见MSDN

CString--->COleDateTime:

方法1：COleDateTime::ParseDateTime()

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

方法2：COleVariant

CStringstrDate = _T("1987-06-21");
COleVariantvarTime(strDate);
varTime.ChangeType(VT_DATE);
COleDateTimeoleDate(varTime);
//COleDateTimeoleDate;
//oleDate=varTime;

COleDateTime--->CTime:

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

COleDateTimeoleDate(1987, 6, 21, 0, 0, 0);
SYSTEMTIMEsysTime;
oleDate.GetAsSystemTime(sysTime);
CTimetm(sysTime);

方法2：用VariantTimeToSystemTime函数
COleDateTime--->SYSTEMTIME--->CTime

COleDateTimeoleDate(1987, 6, 21, 0, 0, 0);
SYSTEMTIMEsysTime;
VariantTimeToSystemTime(oleDate,&sysTime);
CTimetm(sysTime);

CTime--->COleDateTime:

方法1：用CTime::GetTime()得到time_t

CTimetime(1987, 6, 21, 0, 0, 0);
time_ttm = time.GetTime();
COleDateTimeoleTime(tm);

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

CTimetime(1987, 6, 21, 0, 0, 0);
SYSTEMTIMEsysTime;
time.GetAsSystemTime(sysTime);
COleDateTimeoleTime(sysTime);
//COleDateTimeoleTime;
//oleTime=sysTime;