Online Sayaç Zaman Sorunu

echo " 
    <table border='1' width='240' height='170' id='table1' bordercolor='#3399FF' bgcolor='#FFFFFF' > 
        <tr> 
            <td width='16' align='center' height='20'> 
            <img border='0' src='img/on.gif' width='16' height='16'></td> 
            <td width='75' height='20'> 
            <font face='Tahoma' color='#FF0000'><span style='font-size: 9pt'>Online Ziyaretçi</span></font></td> 
            <td width='67' height='20'> 
            <font face='Tahoma' style='font-size: 10pt' color='#FF0000'>" ;  
#---Aktif Ziyaretçi Sayısı-------------------------------------------------------------------- 
$ip = $_SERVER['REMOTE_ADDR'];  
$past = time()-150;  
mysql_query("DELETE FROM online WHERE time < $past");  
$result = mysql_query("SELECT time FROM online WHERE ip='$ip'");  
$time = time();  
if($row = mysql_fetch_array($result)){  
mysql_query("UPDATE online SET time='$time',ip='$ip' WHERE ip='$ip'"); 
}else{  
mysql_query("INSERT INTO online (ip,time) VALUES ('$ip','$time')") or die(mysql_error());  
}  
$result   = mysql_query("SELECT ip FROM online");  
$aktifkac = mysql_num_rows($result); 
echo $aktifkac;      
#---Aktif Ziyaretçi Sayısı--------------------------------------------------------------------             
            echo "</font></td> 
        </tr> 
        <tr> 
            <td width='16' align='center' height='20'> 
            <img border='0' src='img/user.gif' width='16' height='16'></td> 
            <td width='75' height='20'> 
            <font face='Tahoma' style='font-size: 8pt'>Bugün Tekil</font></td> 
            <td width='67' height='20'> 
            <font face='Tahoma' style='font-size: 9pt' color='#003366'>";  
#---Bugün Tekil Toplam Kaç Kişi Girmiş--------------------------------------------------------             
$bugun = date("Y-m-d"); 
$sorgu = mysql_query("select tarih from ziyaret where tarih='$bugun'"); 
$bugunku = mysql_num_rows($sorgu); 
echo $bugunku;              
#---Bugün Tekil Toplam Kaç Kişi Girmiş--------------------------------------------------------         
            echo "</font></td> 
        </tr> 
        <tr> 
            <td width='16' align='center' height='20'> 
            <img border='0' src='img/user.gif' width='16' height='16'></td> 
            <td width='75' height='20'> 
            <font face='Tahoma' style='font-size: 8pt'>Dün Tekil</font></td> 
            <td width='67' height='20'> 
            <font face='Tahoma' style='font-size: 9pt' color='#003366'>";  
#---Dün Tekil Toplam Kaç Kişi Girmiş---------------------------------------------------------- 
$baslat  =date(Y."-".m."-".d); 
$year    =substr($baslat, 0,4); 
$month   =substr($baslat, 5, 2); 
$day     =substr($baslat, 8, 2); 
$bitis   =date("Y-m-d", mktime(0, 0, 0, $month, $day-1, $year)); 
$sorgula = mysql_query("select tarih from ziyaret where tarih='$bitis'");     
$dunku = mysql_num_rows($sorgula); 
echo $dunku; 
#---Dün Tekil Toplam Kaç Kişi Girmiş----------------------------------------------------------         
            echo "</font></td> 
        </tr> 
        <tr> 
            <td width='16' align='center' height='20'> 
            <img border='0' src='img/users.gif' width='16' height='16'></td> 
            <td width='75' height='20'> 
            <font face='Tahoma' style='font-size: 8pt'>Toplam Tekil</font></td> 
            <td width='67' height='20'> 
            <font face='Tahoma' style='font-size: 9pt' color='#003366'>";  
#---Toplam Tekil Kaç Kişi Girmiş--------------------------------------------------------------             
$ipsi  = $_SERVER['REMOTE_ADDR']; 
$tarih = date("Y-m-d"); 
$ipkontrol = mysql_query("select * from ziyaret where ip='$ipsi' order by id desc"); 
$yaz   = mysql_fetch_assoc($ipkontrol); 
$vip   = $yaz['ip']; 
$vtarih= $yaz['tarih']; 
$bak = mysql_num_rows($ipkontrol); 
if($bak>0){  //if- 
    if($vtarih<$tarih){ 
    $kayit_1 = mysql_query("insert into ziyaret (ip,tarih) values ('$ipsi','$tarih')"); 
    }  
}//if- 
else{ 
$kayit_2 = mysql_query("insert into ziyaret (ip,tarih) values ('$ipsi','$tarih')"); 
} 
$toplamne = mysql_query("select * from ziyaret"); 
$toplamziyaret  = mysql_num_rows($toplamne); 
echo $toplamziyaret;             
#---Toplam Tekil Kaç Kişi Girmiş--------------------------------------------------------------             
            echo "</font></td> 
        </tr>                         
        <tr> 
            <td width='16' align='center' height='20'> 
            <img border='0' src='img/ip.gif' width='16' height='16'></td> 
            <td width='142' colspan='2' height='20'> 
            <font face='Tahoma' style='font-size: 8pt'>IP Adresiniz: </font> 
            <font face='Tahoma' style='font-size: 9pt'> [ </font> 
            <font face='Tahoma' style='font-size: 9pt' color='#FF0000'> $ipsi </font> 
            <font face='Tahoma' style='font-size: 9pt'> ] </font></td> 
        </tr>                         
    </table> 
</div>";

date_default_timezone_set('Europe/Istanbul');