<?php
$when = '2011/07/11 11:22:52';

if ($when > strtotime('+30 days', time()));
{
echo "too far into the future";
header('Refresh: 10; URL=page.php');
die();
}

if ($when < time());
{
echo "less than current time";
header('Refresh: 10; URL=page.php');
die();
}

echo "pass";
header('Refresh: 10; URL=page.php');
die();
?>