Automatically inactivate after a certain date - php

Question

I want to make an advertisment manager. When an ad reaches its expiry date it becomes non-active. But when I tried to make it and tried it, all of the ads change into non-active even though they haven't reached their expiry dates.
Here's my code:
$query_banner = mysql_query("SELECT * FROM ad_tbl ORDER BY ID DESC LIMIT $from,$max_show") or die(mysql_error());
while($show=mysql_fetch_array($query_banner))
{
$no++;
if(($no%2)==0)
$color = '#f2f2f2';
else
$color = '#f9f9f9';
$expired_date = $show['expiry_date'];
$today_date = date("m/d/Y");
$expired = strtotime($expiry_date);
$today = strtotime($today_date);
if($expired > $today)
{
$valid = "yes";
}
else
{
$valid = "no";
$query_expired = mysql_query("UPDATE ad_tbl SET status='Non-Active' WHERE expiry_date <= $today") or die(mysql_error());
}
}

Answer 1

Try:
$expiredDateTime = new DateTime($expiry_date);
$expired = $expiredDateTime->format('U');
$today = date('U'); // This will default give you timestamp for "now", saving you a step
If that works then I fear your m/d/y format could be the root of the issue. To check you should echo your strtotime values out and stick them into a converter, see what it says.