Plugin to use publish date, not draft date?

The way I use my blog is that I have one person write a draft and save it to the server as a draft. Then I have another person edit it and change it from “draft” to “published,” This puts the post live on the blog.

Heres my problem: The post’s date is not when it was published, but when it was drafted. I need it to be when it was publish, when it was made live. How do I change this?

Is there any plugin or hack that can do this?

– Gabe