When I choose the order status "update" and submit it via the order management panel, I receive a white page. The debug file in cache says this:
In reference to this line in the orders.php file:
[05-Apr-2012 11:00:52] PHP Fatal error: Call to undefined function date_diff() in /home/mydirectory/public_html/myadmin/orders.php on line 148
Any ideas on how I can fix that issue?
$zc_max_days = date_diff($check_status->fields['date_purchased'], date('Y-m-d H:i:s', time())) + DOWNLOAD_MAX_DAYS;