Display modified time like: “1 hour ago”

Hi,

I am using the plugin https://www.ads-software.com/plugins/wp-last-modified-info/ to display the modifed time like: “1 hour ago”, “2 days ago”… instead of display the date.

They have template tags for modified date: %post_modified%

But it showing the code instead of displaying date after insert it to your post list template

<ul class="list-unstyled">
[groups]
<li><h4>[group_title]</h4>
<ol>
[posts]
<li>
[title] - %post_modified%
</li>
[/posts]
</ol>
</li>
[/groups]
</ul>

What should I do?

Thank you!