We'll create fresh WordPress site with WP Post Expires installed. You have 20 minutes to test the plugin after that site we'll be deleted.
A simple plugin that allows to set the date for the posts, after which will be performed one of 3 actions: “Add prefix to title”, “Move to drafts”, “Move to trash”.
XNPostExpires::isExpired($post_id)
XNPostExpires::dateExpiration($post_id, $date_format)