/**
  * Converts a timestamp "ts" to a string that the database can understand.
  *
  * @param ts	a timestamp in Unix date time format.
  *
  * @return  timestamp string in database timestamp format
  */
 function DBTimeStamp($ts, $isfld = false)
 {
     if (empty($ts) && $ts !== 0) {
         return 'null';
     }
     if ($isfld) {
         return $ts;
     }
     if (is_object($ts)) {
         return $ts->format($this->fmtTimeStamp);
     }
     # strlen(14) allows YYYYMMDDHHMMSS format
     if (!is_string($ts) || is_numeric($ts) && strlen($ts) < 14) {
         return adodb_date($this->fmtTimeStamp, $ts);
     }
     if ($ts === 'null') {
         return $ts;
     }
     if ($this->isoDates && strlen($ts) !== 14) {
         $ts = _adodb_safedate($ts);
         return "'{$ts}'";
     }
     $ts = ADOConnection::UnixTimeStamp($ts);
     return adodb_date($this->fmtTimeStamp, $ts);
 }
 function DBDate($d, $isfld = false)
 {
     if (empty($d) && $d !== 0) {
         return 'null';
     }
     if ($isfld) {
         $d = _adodb_safedate($d);
         return 'TO_DATE(' . $d . ",'" . $this->dateformat . "')";
     }
     if (is_string($d)) {
         $d = ADORecordSet::UnixDate($d);
     }
     if (is_object($d)) {
         $ds = $d->format($this->fmtDate);
     } else {
         $ds = adodb_date($this->fmtDate, $d);
     }
     return "TO_DATE(" . $ds . ",'" . $this->dateformat . "')";
 }