Fumiki Takahashi

TAROSKY INC.

You can enter expiration date on edit screen. 
This plugin runs cron every minute to search expired posts and make them <code>private</code>.

Taro Clockwork Post

A WordPress plugin to expire post with specified date.

popland

popeating

Post expire date Sidebar for Gutenberg will add a Gutenberg sidebar where the user can enable Post expiration by setting an expiration date and time and a status (draft, trash, private) the Post will revert once expired. Expiration date can be removed or rescheduled at any time. Post expire date for Gutenberg uses wp-cron to schedule the single event, please be sure you have wp-cron active on your installation. 
You can print the expiration date and time inside a post, using the shortcode [expiration_datetime] inside your post.

Post expire date Sidebar

Post expire date sidebar for Gutenberg it's a minimal plugin that allow to set an expiration date for posts

Taro Clockwork Post vs Post expire date Sidebar