This page is configured to be cached by mod_disk_cache.  You can determine if it's cached by looking at the time below.  If the time is stale/old/outdated then you are successfully looking at a cached page.  
If the time is current, then the page isn't cached. You can get a new (uncached) version of this page by simply holding down the "shift" button on your key board while clicking the "refresh" button on your web browser.
<blockquote> 
<ul>
<li>The UTC time generated on the server-side by PHP is: <b>2021-04-21 01:41:27</b>.  
<li>Using Javascript I will format this time in your local format: <b><script type="text/javascript">var d = new Date(Date.parse("Wed, 21 Apr 2021 01:41:27 +0000"));document.write(d.toLocaleString());</script></b>
</ul>
</blockquote>