I think I found the frontend code:
function handle_sdm_download_via_direct_post() {
if (isset($_REQUEST['smd_process_download']) && $_REQUEST['smd_process_download'] == '1') {
global $wpdb;
$download_id = strip_tags($_REQUEST['download_id']);
$download_title = get_the_title($download_id);
$download_link = get_post_meta($download_id, 'sdm_upload', true);
So would I add :
$download_date = get_the_date( $format, $post_id );