Simon

<p>This plugin creates a full screen ad with an expiration date without cloaking. All you have to do is add a link, image and expiration and you can have a full screen ad with a cookie.</p>
<p>There are plugins out there that create separate full page ads or landing pages versus what Google sees. So the plugin would show the user one page while showing another page to a search engine. This can be called cloaking which is never really a good strategy to show ads or landing pages.</p>
<p>This plugin doesn’t create landing pages. This plugin creates full page ads to promote your product or service without cloaking.</p>


Mega Ad

This plugin creates a full screen ad with an expiration date without cloaking.

X-NicON

<p>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”.</p>
<h4>Features:</h4>
<ul>
<li>Set post expire date and time</li>
<li>Support custom post type (post and pages by default)</li>
<li>Action for expired posts: move to drafts, move to trash or add custom prefix for title</li>
<li>Adds class “post-expired” to post that expired on the site and in admin interface (for custom styles in theme)</li>
</ul>
<h4>Use in theme:</h4>
<pre><code>XNPostExpires::isExpired($post_id)

XNPostExpires::dateExpiration($post_id, $date_format)
</code></pre>


WP Post Expires

I haven't tried to debug what's wrong, but as soon as I installed the plugin I was unable to see the editor icons nor actually click on the "edit" to change the publishing date or the expiration date. This is a fantastic plugin idea, hope to see it fully functional.

Broke Admin

Plugin adds post expires time after which will be performed actions: add prefix to title, move to drafts or trash.

Mega Ad vs WP Post Expires