how-to-display-time-ago-for-posts-and-comments/

Open functions.php file of your theme and paste following code and Save:

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function time_ago( $type = 'post' ) {     $d = 'comment' == $type ? 'get_comment_time' : 'get_post_time';     return human_time_diff($d('U'), current_time('timestamp')) . " " . __('ago'); }

Now place the following snippet in either single.php or comments.php (wherever you want to show it) within loop.

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1	<?php echo time_ago(); ?>

Collect from: http://www.wpcookies.com/how-to-display-time-ago-for-posts-and-comments/