I made some tweaks....
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<table>
<tr>
<td>IP</td><td>Whois Data</td><td>time</td><td>Date</td><td>Reffer</td><td>Page Visited</td></tr>
<tr>
<?PHP
ini_set("display_errors","2");
ERROR_REPORTING(E_ALL);
$today= date("d");
echo $today;
require_once('visitors_connections.php');
mysql_select_db($database_visitors, $visitors);
$query = "SELECT * FROM visitor_list WHERE visitor_day = '$today'";
$result = mysql_query($query);
while($row = mysql_fetch_array($result, MYSQL_ASSOC))
{
echo '<td>{$row['visitor_ip']} </td>
<td>{$row['visitor_whois']} </td>
<td>{$row['visitor_min']} : {$row['visitor_hour']} </td>
<td>{$row['visitor_day']} , {$row['visitor_month']} {$row['visitor_year']} </td>
<td>{$row['visitor_ref']}</td>
<td>{$row['visitor_page']}</td>';
}
?>
</tr>
</table>
</body>
</html>
