CRED expiration_update

add_action('cred_submit_complete', 'expiration_update',10,2);
function expiration_update($post_id, $form_data)
{

    // if a specific form
    if ($form_data['id']==19)
    {
     $new_date = get_post_meta($post_id, 'wpcf-date-of-home-purchase', true);

    //We update the _cred_post_expiration_time Field in the Database with this new value
     update_post_meta($post_id, '_cred_post_expiration_time', $new_date);

    }
}