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Compare a DateTime object against another in PHP 5.3
function....
    // I can't get this script to execute when I know the time has passed.
    $now = new DateTime("now", new DateTimeZone('UTC'));
    $row_date = new DateTime($row["due_date"], new DateTimeZone('UTC'));
    if ($row_date->format('Y-m-d H:i:s') <= $now->format('Y-m-d H:i:s')) {
        mysql_query(".....")VALUES ("....")or die(mysql_error());
        mysql_query("DELETE FROM ......")or die(mysql_error());
    }
    else {
        // The time has not come yet.
    }

if ($row_date <= new DateTime) { /* Do something */ }

$ts=strtotime($date);

date_default_timezone_set('UTC');
$row_date = strtotime($row["due_date"]);
if ($row_date <= time()) { // The time has come
    mysql_query(".....") VALUES ("....") or die(mysql_error());
    mysql_query("DELETE FROM ......") or die(mysql_error());
}
else {
    // The time has not come yet.
}