Dogan Ucar

WP Last Modified adds the ‚last_modified_date‘ shortcode to your WordPress installation. This shortcode shows the last timestamp of your post/page. Simply use the „format“ attribute for custom date formats (it uses PHP’s date() function). 
The “description” attribute enables a brief description which changes has been made with the last modification. 
WP Last Modified shows also the actual revision of and the publication date of the post/page. 
You can customize the text which will be shown under each post/page under settings -> WP Last Modified Settings. You can also hide one of the elements if you do not want them.
With version 1.1.0, WP Open Last Modified was renamed to WP Last Modified.
Features:
<ul>
<li>last modification timestamp of a post/page</li>
<li>publication timestamp of a post/page</li>
<li>timestamp format customizable</li>
<li>revision count</li>
<li>custom text with placeholders</li>
<li>last modification description</li>
<li>excluding single posts/pages from displaying the last modification timestamp</li>
</ul>

WP Last Modified

This plugins adds the last modified date, current revision and the publication date of your post/page. Simply use the shortcode [last_modified_date]

MotoPress

This plugin allows you to optionally keep the last post modified date unchanged when you update the post in WordPress Classic Editor.
It adds datepicker and checkbox to the Publish panel of every post. If you select checkbox when you update the post, the last modified date will change; if not, this date will not change no matter how many times you update the post.
This is a helpful thing if you make only slight changes to the post and don’t want it to be noticed by the search engine crawlers or even in the post information publicly visible on your website.
Only use the plugin to keep the last modified date unchanged for minor changes. If you make a major change to a post, make sure to check the box to update the last modified date, thus making search engines aware of the update.
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<h3>Copyright</h3>
Сontrol Post Modified Date, Copyright (C) 2023, MotoPress https://motopress.com/ 
Сontrol Post Modified Date plugin is distributed under the terms of the GNU GPL.

Сontrol Post Modified Date

Keep the last modified date unchanged for minor post updates.

WP Last Modified vs Сontrol Post Modified Date