Steve

Content Expiration is a WordPress plugin that allows authors/editors to set an expiration date on posts or pages. The plugin is intended to be simple with easy-to-read code.
An expiration can be set by specifying a number of days (e.g., expire in 90 days) or a specific date/time (e.g., May 10, 2018 at 10:00 PM). Two weeks prior to the expiration date, the author of the post/page is sent a warning email. The author receives another notification email upon expiration.
When a post/page expires, it is not deleted. Instead, it is given a status of Expired and hidden from public view. Visitors to the site will receive the regular WordPress 404 Page Not Found error.
The expiration can be reset by any editor or administrator of the site. They must log in and edit the expiration settings of the post/page.
Content Expiration is developed on GitHub. Please submit bugs reports and contributions on <a href="https://github.com/srguglielmo/Content-Expiration" rel="nofollow ugc">the GitHub Project page</a>.
For general support and questions, please use the <a href="https://wordpress.org/support/plugin/content-expiration/" rel="ugc">WordPress support forum</a>.

Content Expiration

Content Expiration is a WordPress plugin to set an expiration date on posts or pages.

X-NicON

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”.
<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.

Content Expiration vs WP Post Expires