MFC 获取系统时间

CString GetSystemTime(void)
{
	SYSTEMTIME st;
	CString strDate,strTime,strDateTime;
	GetLocalTime(&st);
	strDate.Format(_T("%4d-%2d-%2d"),st.wYear,st.wMonth,st.wDay);
	strTime.Format(_T("%2d:%2d:%2d"),st.wHour,st.wMinute,st.wSecond);
	strDateTime.Format(_T("%s %s"),strDate,strTime);
	return strDateTime;
}