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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echo time_ago(); ?>