The jelly AddComment class modifies a comments created date if the user has specified the date in the jelly tag. At the moment it grabs the comment with the most recent create date and modifies it. This could potentially be a bad thing, we could run into some concurrency issues, this should instead get the specific comment it is looking for (by id). This may be a bit tricky since the jelly tag uses the front-end action to create the value.