Feature Request: Restrict user to be able to view only future content, not past

I am taking on a new project that is taking a little different twist on the subscription model. They would like to allow users to only view future created content and not have access to content that was previously posted. They are going to offer those previously posted articles as individual products for sale.

In short, I need the ability to restrict access to specific content types based on the post date and the user's creation date. This may be outside the scope of this module. If so, does anyone have any suggestions for how to accomplish this?

Thanks!