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]

Tejinder Benipal

Mark E. Jeftovic

This plugin offers limited support. This is something I had developed for my own blog (Bombthrower.com) and decided to release it because a lot Bitcoiners have taken to referring to the blockheight as a kind of timestamp.
In the back of my mind I have the idea that if it becomes widely used, I may add options to link the blockheight field to an on-chain copy of the post somewhere, like IPFS (or maybe an ordinal).
<h3>Support</h3>
If you have a question or concern around the plugin, you can:
<pre><code>* Email me at microsaas@thirteen.ca 
* Catch me on Twitter: @Stuntpope
* On Nostr: npub1elwpzsul8d9k4tgxqdjuzxp0wa94ysr4zu9xeudrcxe2h3sazqkq5mehan (NIP-05: markjr@bombthrower.com) 
</code></pre>
If you find this plugin useful, please consider donating to support its development:
<ul>
<li>
via BTC: bc1qcjjk8f9ynznm9aqx4lqtaucw5y8qs0gs0a8aju
</li>
<li>
Lightning: lnbc1pjzem7hpp502vefct5jyv4lgjrhr76rstfvgq4tsds7eyhvsts9z6l47exr0fsdqu2askcmr9wssx7e3q2dshgmmndp5scqzpgxqyz5vqsp5hjumlyrmchfvkd0q3tc3q0kktlpnu7d3frjk4ln5uq4n6pjm00zs9qyyssqma8xvjhshaq25aq0p5t85eyq2jjxsygjd97ka0tmrtpaajndwmj4xf5x4mtjalp8xzj8mz8ju6kmyet8l8r59z3a75nu60npglddltspfffw7c
</li>
</ul>

Bitcoin Blockheight

Bitcoin Blockheight is a straight-forward plugin that fetches the current Bitcoin Blockheight and adds it to your Wordpress posts, under or beside the …

WP Last Modified vs Bitcoin Blockheight