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Convert get_comments->comment_date in relative date

In my index.php, I'd like to display some details about last comment for each post...

some thing like:

Last reply by user_name - 2 hours ago

Now with this code I'm able to display :

Last reply by user_name - 2011-07-29 11:23:31

$comments = get_comments('post_id=' . $post->ID . '&number=1');

if($comments) {

foreach($comments as $comment) :

echo('Last reply by '. $comment->comment_author .

' - ' . $comment->comment_date); 

endforeach;

}

How can I achieve it?

Just FYI

For timestamps within the looop for both post and comments I can use this function to do so:

if(!function_exists('how_long_ago')){

        function how_long_ago($timestamp){

            $difference = time() - $timestamp;



            if($difference >= 60*60*24*365){        // if more than a year ago

                $int = intval($difference / (60*60*24*365));

                $s = ($int > 1) ? 's' : '';

                $r = $int . ' year' . $s . ' ago';

            } elseif($difference >= 60*60*24*7*5){  // if more than five weeks ago

                $int = intval($difference / (60*60*24*30));

                $s = ($int > 1) ? 's' : '';

                $r = $int . ' month' . $s . ' ago';

            } elseif($difference >= 60*60*24*7){        // if more than a week ago

                $int = intval($difference / (60*60*24*7));

                $s = ($int > 1) ? 's' : '';

                $r = $int . ' week' . $s . ' ago';

            } elseif($difference >= 60*60*24){      // if more than a day ago

                $int = intval($difference / (60*60*24));

                $s = ($int > 1) ? 's' : '';

                $r = $int . ' day' . $s . ' ago';

            } elseif($difference >= 60*60){         // if more than an hour ago

                $int = intval($difference / (60*60));

                $s = ($int > 1) ? 's' : '';

                $r = $int . ' hour' . $s . ' ago';

            } elseif($difference >= 60){            // if more than a minute ago

                $int = intval($difference / (60));

                $s = ($int > 1) ? 's' : '';

                $r = $int . ' minute' . $s . ' ago';

            } else {                                // if less than a minute ago

                $r = 'moments ago';

            }



            return $r;

        }

    }

and this 2 snippets for post and comments

//post:

if(!function_exists('how_long_ago')){the_time('F jS, Y'); } else { echo how_long_ago(get_the_time('U')); } 



//comments:

if(!function_exists('how_long_ago')){the_time('F jS, Y'); } else { echo how_long_ago(get_comment_time('U')); } 

But I 'm unable to use this for the above case...

Anyone can help?

This question has been answered.