Probleme bei Datumsabfragen in php mit SQL

$akttag=(date("j"));  
$aktmonat=(date("n"));  
$aktjahr=(date("Y"));  
<form action="holen.php" method="post"  >  
<tr>
<td>
 </td>
 </tr>
  <tr>
    <td>
<?    echo "<select name=\"tagvon\">";  
         for ($tag=1; $tag <= 31; $tag++) {
                 echo "<option value=\"$tag\" ";  
              if ($akttag==$tag) echo "selected ";  
                  echo ">$tag</option>";  
}
?>
    </td>
    <td>
<?
    $arrmonat = array("","Januar", "Februar", "März", "April", "Mai", "Juni","Juli", "August", "September", "Oktober","November","Dezember");  
    echo "<select name=\"monatvon\">";  
         for ($monat=1; $monat <= 12; $monat++) {
                 echo "<option value=\"$monat\" ";  
         if ($aktmonat==$monat) echo "selected ";  
         echo ">$arrmonat[$monat]</option>";  

}
 echo "Arrmonat= $arrmonat[$monat]";  
?>

    </td>
    <td>
<?    echo "<select name=\"jahrvon\">";  
         for ($jahr=2009; $jahr <= 2020; $jahr++) {
                 echo "<option value=\"$jahr\" ";  
         if ($aktjahr==$jahr) echo "selected ";  
         echo ">$jahr</option>";  
}
?>
     </td>
     <td width="25">  
     </td>
     <td>
    <?    echo "<select name=\"tagbis\">";  
         for ($tag1=1; $tag1 <= 31; $tag1++) {
                 echo "<option value=\"$tag1\" ";  
         if ($akttag==$tag1) echo "selected ";  
         echo ">$tag1</option>";  
}
?>
    </td>
    <td>
<?
    $arrmonat1 = array("","Januar", "Februar", "März", "April", "Mai", "Juni","Juli", "August", "September", "Oktober","November","Dezember");  
    echo "<select name=\"monatbis\">";  
         for ($monat1=1; $monat1 <= 12; $monat1++) {
                 echo "<option value=\"$monat1\" ";  
         if ($aktmonat==$monat1) echo "selected ";  
         echo ">$arrmonat1[$monat1]</option>";  
}
?>
     </td>
     <td>
<?    echo "<select name=\"jahrbis\">";  
         for ($jahr1=2009; $jahr1 <= 2020; $jahr1++) {
                 echo "<option value=\"$jahr1\" ";  
         if ($aktjahr==$jahr1) echo "selected ";  
         echo ">$jahr1</option>";  
}
?>
     </td>
     <td width="25">  
     </td>

<td><input name="nachname" value = "<?echo $faname?>" ></td>  
</tr>

</table>
<table>
        <tr>
         <td width="150" ><input type="submit" name="submit" value="Daten anzeigen"></td>  
         </tr>
</table>
</form>

@$datumvon=$_POST["jahrvon"]."-".$_POST["monatvon"]."-".$_POST["tagvon"];  
@$datumbis=$_POST["jahrbis"]."-".$_POST["monatbis"]."-".$_POST["tagbis"];  
@$namecheck=$_POST["nachname"];  

$cldb = mysql_connect($_SESSION['host'], $_SESSION['dbuser'], $_SESSION['passwort']) or die(mysql_error());  
mysql_select_db($_SESSION['db']);  
$select = "SELECT * from pzetool where (zpro = $fanr) and (zdat >= $datumvon) and (zdat <= $datumbis)";  
$result=mysql_query($select);
echo mysql_error();
echo $select;

while($ausgabe = mysql_fetch_array($result)){
       echo "<pre>";  
       print_r($ausgabe);
       echo "</pre>";