Copy/Paste Threads + Attachments

I like to create articles in the backend. Sometimes it takes me a week to complete them, so when I post them LIVE, I would like them to have the current thread date so I would copy/paste the content in a new thread.

Is there a way to copy/paste from one thread to another, including the attachments (images and thumbnails), from the original thread?

I hope that makes sense. Thanks!