Just did it.
includes/modules/pages/checkout_shipping/header_php.php
edit as follows (black is existing and red is to be added)
Code:
//BEGIN Order Delivery Date
if (zen_not_null($_POST['order_delivery_date'])) {
$_SESSION['order_delivery_date'] = zen_db_prepare_input($_POST['order_delivery_date']);
}
$order_delivery_date = $_SESSION['order_delivery_date'];
if (trim($order_delivery_date) == '') {
$messageStack->add_session('checkout_shipping', 'Please select a delivery day from
the calendar', 'error');
zen_redirect(zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'));
}
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