ADO读写Date Time方式

// 读取日期
var = m_pResultSet->GetCollect(_variant_t( "Birth_Time" ));

DATE            dt      = var.date;
COleDateTime    da      = COleDateTime(dt);
CString         strData = da.Format(_T( "%Y-%m-%d" ));
m_GridList.SetItemText(m_nRow, m_nColumn, strData);


// 写入日期
COleDateTime    oleDate = COleDateTime::GetCurrentTime();
CString         strDate = oleDate.Format(_T( "%Y-%m-%d %H:%M:%S" ));

m_pBorrowRS->Fields->GetItem(_variant_t( "Borrow_Date" ))->PutValue(_variant_t(strDate));
m_GridList.SetItemText(m_nRow, m_nColumn, strDate);

或：
COleDateTime    oleDate = COleDateTime::GetCurrentTime();

_variant_t  vtDate;
vtDate.vt   = VT_DATE;
vtDate      = oleDate.Format(_T( "%Y-%m-%d %H:%M:%S" ));

m_pBorrowRS->Fields->GetItem(_variant_t( "Borrow_Date" ))->PutValue(vtDate);
m_GridList.SetItemText(m_nRow, 3, ( LPCTSTR )_bstr_t(vtDate));

 COleDateTime::GetCurrentTime()        var.date                

                                    \                     /                 

                                      \                 /                  

                                         \            /                   

                                COleDateTime  oleDate;                                            

                                        /              \                  

                                      /                  \                

                                    /                      \   

              var = oleDate.Format(...)     strDate = oleDate.Format(...)