$today = date("m/d/Y");

<div id="myDiv" class="col-md-6">
    <div class="alert alert-info" role="alert"><span class="glyphicon glyphicon-book" aria-hidden="true"></span>&nbsp;&nbsp;Passport <?php echo "<strong><a href=\"view_latest_passport.php?id=$id\"> $passport</a> /&nbsp; Passport Expiration Date:</strong> $passport_expiration"; ?></div>
</div>
<script type="text/javascript">
if ($today == $passport_expiration)
{
    document.getElementById("myDiv").Element.style.backgroundColor="green" ;
}
else
{
    document.getElementById("myDiv").Element.style.backgroundColor="red";
}
</script>