Harpinder

This plugin is very useful for those who want to display their pages (on front end) from some specific date (start date) to some specific date (end date). It creates a meta box in Edit Page where Admin user can add start & end date/time. After End date has been passed, the page will expire and is saved as ‘draft’. Very fast, easy to use plugin for both single & multi site installation. It uses GMT time format.
<h3>Thank You</h3>
Thank you for trying my plugin!

Automatic Page Publish / Expire

It lets user adds start and end date of a page for publishing and after end date has been passed, page's status is automatic marked as draft.

arcsprd

This plugin is used to show messages based on dates. Start Date, End Date and Message section is added to Site Identity. Based on the dates input message will show.
=> Install Plugin and go to Appearance >> Customize >> Site Identity 
=> Add Start Date, Expire Date and Second Tagline. 
=> Based on the Start Date and Expired Date, Second Tagline message will show on site.
<pre><code><?php code(); ?>
</code></pre>

Automatic Page Publish / Expire vs SiteMessages