Mange tak igen..
Kan ikke få den til at vise noget. 
her er mit script
<?php 
// time tæller 
function get_time_difference( $start, $end )
{
    $uts['start']      =    strtotime( $start );
    $uts['end']        =    strtotime( $end );
    if( $uts['start']!==-1 && $uts['end']!==-1 )
    {
        if( $uts['end'] >= $uts['start'] )
        {
            $diff    =    $uts['end'] - $uts['start'];
            if( $days=intval((floor($diff/86400))) )
                $diff = $diff % 86400;
            if( $hours=intval((floor($diff/3600))) )
                $diff = $diff % 3600;
            if( $minutes=intval((floor($diff/60))) )
                $diff = $diff % 60;
            $diff    =    intval( $diff );            
            return( array('days'=>$days, 'hours'=>$hours, 'minutes'=>$minutes, 'seconds'=>$diff) );
        }
        else
        {
            trigger_error( "Ending date/time is earlier than the start date/time", E_USER_WARNING );
        }
    }
    else
    {
        trigger_error( "Invalid date/time data detected", E_USER_WARNING );
    }
    return( false );
}
?>
        <?php include('inc/connection.php'); 
    $datoer = array();
    $query = mysql_query("SELECT * FROM time_reg WHERE user='".$_GET[user]."' AND add_date >= '".$_GET[from_date]."' AND add_date <= '".$_GET[to_date]."' GROUP BY add_date ORDER BY add_date desc");
    while($row = mysql_fetch_assoc($query)){ $datoer[] = $row['add_date']; }    
    foreach($datoer as $dato){        
        $query = "SELECT * FROM time_reg GROUP BY add_date ORDER BY add_date desc"; 
     $result = mysql_query($query) or die(mysql_error());
    $row = mysql_fetch_array($result) or die(mysql_error());
?>
<table width="700" border="0" cellspacing="0" cellpadding="0" class="tid_dag">
  <tr>
    <td><h3> <?= strftime ("%A", strtotime($dato));?> Den 
 <?= date("d/m/Y", strtotime($dato));?> - Medarbejder - <?= $row[user]; ?>
      </h3>
<table width="700px">
  <tr>
        <td width="80">Start</td>
        <td width="80">Slut</td>
        <td width="215">Kunde</td>
        <td width="215">Sag</td>
        <td width="203">Samlet tid</td>
        <td width="203">Tjek ip</td>
    </tr>
<?php
        $query = mysql_query("SELECT * FROM time_reg WHERE add_date = '".$dato."'");
        while($row = mysql_fetch_assoc($query)){
            $start = $row[start_time];
            $end = $row['end_time'];
            list($t1, $m1) = sscanf($start, "%d:%d");
            list($t2, $m2) = sscanf($end, "%d:%d");            
            $timer = ($t2 - $t1) + ($m2 - $m1) / 60;
            if($timer < 0){ $timer = $timer + 24; }
?>
    <tr>
        <td><?=$start; ?></td>
        <td><?=$end; ?></td>
        <td><?=$row['what_case']; ?></td>
        <td><?=$row['place']; ?></td>
        <td>
                              <?php 
                      // a START time value
$start = $row[start_time];
// an END time value
$end = $row[end_time];
// what is the time difference between $end and $start?
if( $diff=@get_time_difference($start, $end) )
{
  echo sprintf( '%02d:%02d', $diff['hours'], $diff['minutes'] );  
}
else
{
  echo "Angiv slut tidspunkt";
}
?></td>
        <td><a href="
http://whatismyipaddress.com/ip/<?=$row[ip]?>" target="_blank">Spor ip</a></td>
    </tr>
<?php
        }
?>
</table>
<?php
    }
?>
har en lille opgave mere til dig, men opretter en tråd mere på den hvis du har lyst til at hjælpe lidt mere