danivalentin

This was based on <a href="http://lesterchan.net/wordpress/readme/wp-relativedate.html" title="Relative Date" rel="nofollow ugc">Lester Chan’s Relative Date plugin</a>. 
It tries to simplify things a bit. This plugin can:
<ul>
<li>Replace the_date() in the post</li>
<li>Replace get_comment_date() or comment_date() in the comments</li>
</ul>
Note that if your theme is writing the date in a different form, it won’t work. You have to 
replace its function call to one of the above (in the TwentyTen theme for example, replace twentyten_posted_on() 
by the_date().
Also important to say that, comment replacement won’t work if you are using the default wp comment renderer because 
it calls get_comment_time() as well. You have to do a customized callback function to use with 
wp_list_comments( array( ‘callback’ => ‘your_customized_function_here’ ) ). (ok, maybe things were not 
simplified that much :/)
There is a options page (under settings in the Admin) where you can choose which dates you 
want to replace (posts/comments). Posts date are by default checked.
Portuguese translation included.

Simple Relative Date

A simple way to turn your post/comment date in its relative versions.

Scott Werner

When inserting an image into a post, WordPress uses absolute URLs to the files. This plugin overrides that functionality and forces it to use relative URLs.
For example:
WordPress Default: 
http://www.example.com/wp-content/uploads/2013/04/example.jpg
Plugin Override: 
/wp-content/uploads/2013/04/example.jpg
This is particularly useful if you plan on switching domains ever as well as reducing HTTP requests.

Relative Image URLs

Creates relative URLs for images when inserting into posts.

Simple Relative Date vs Relative Image URLs