cambiar formato fecha?

[Manoloweb]

Código PHP:

  while ($data = pg_fetch_object ($result, $row)){        printf("<tr><td width='75'>&nbsp;%s</td><td width='75'>&nbsp;%s</td><td width='75'>&nbsp;%s</td><td width='175'>&nbsp;%s&nbsp;</td></tr>", $data->num_factura, date("d-m-Y",strtotime($data->fec_factura)), $data->val_factura, date("d-m-Y",strtotime($data->fec_vencimi));  $nom = $data->nombres;         $ape = $data->ap_paterno;         $val = $data->val_factura   . " ";         $sum = $sum + $val;         $row++;         if ($row==$nr){         break;        }      }