Publish a previously submitted post with current timestamp?

I have a blog where authors submit items to be later approved and published. These items can sometimes sit in a queue for days waiting for approval. Unfortunately our editors often don’t remember to update the timestamp on the submitted items, and don’t update them to the current time, which means they don’t show up on the index page at the top where you might expect once they are published. Is there any easy way to have a “Publish With Current Timestamp” option on these previously submitted items that bear older timestamps?