by Lester Chan on WordPress.org

Post - Today
Like ‘Today’, ‘Yesterday’, ‘2 Days Ago’, ‘2 Weeks Ago’, ‘2 ‘Seconds Ago’, ‘2 Minutes Ago’, ‘2 Hours Ago’.
You need not do anything. WP-RelativeDate will automatically modify your post/comment date or time display. No text will be added if the post or comment is more than a month old.
It will add the following text accordingly:
* Post/Comment Date
* Today
* Yesterday
* X days ago
* X weeks ago
* Post/Comment Time
* X seconds ago
* X minutes ago
* X hours ago
[relativedate]
[relativedate date_format="jS F Y" ago_only="false"][relativetime]
[relativetime time_format="H:i" ago_only="false"]https://github.com/lesterchan/wp-relativedate
http://dev.wp-plugins.org/browser/wp-relativedate/i18n/
I spent most of my free time creating, updating, maintaining and supporting these plugins, if you really love my plugins and could spare me a couple of bucks, I will really appreciate it. If not feel free to use it without any obligations.