JSFiddle - React, Tailwind, and code Playground

HTML

<section id="comments">
    <article id="comment-1" class="comment">
        <div class="user-image">
            <img src="http://lorempixel.com/50/50/cats" />
        </div>
        <div class="user-info">
            <h2>Derp</h2>
            <time datetime="05/21/2014 09:00:52 AM"></time>
        </div>
        <div class="text">
            Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam malesuada vestibulum dui, eget posuere justo vulputate vitae. Sed fringilla nisi eu est ullamcorper, at dictum arcu gravida.
        </div>
    </article>
    
        <article id="comment-2" class="comment">
        <div class="user-image">
            <img src="http://lorempixel.com/50/50/cats" />
        </div>
        <div class="user-info">
            <h2>Derpina</h2>
            <time datetime="05/19/2014 23:00:24"></time>
        </div>
        <div class="text">
            Quisque sit amet venenatis urna. 
        </div>
    </article>
</section>

CSS

#comments{
    
}

#comments .comment{
    position:relative;
    overflow:hidden;
    margin-bottom:20px;
}

#comments .comment .user-image{
    position:relative;
    width:50px;
    height:50px;
    float:left;
    margin-right:10px;
}

#comments .comment .user-info{
    overflow:hidden;
}

#comments .comment .user-info h2{
    font-size:14px;
    margin-top:0;
    float:left;
}

#comments .comment .user-info time{
    font-size:12px;
    float:right;
}

JavaScript

$(function(){
    var $second = 1000;
    var $minute = $second * 60;
    var $hour = $minute * 60;
    var $day = $hour * 24;
    
    setInterval(function(){
        $('.comment').each(function(){
            var $this = $(this);
            var $time = new Date($this.find('time').attr('datetime'));
            var $now = new Date();
            
            var $distance = $now - $time;
            
            var $days = Math.floor($distance / $day);
            var $hours = Math.floor(($distance % $day) / $hour);
            var $minutes = Math.floor(($distance % $hour) / $minute);
            var $seconds = Math.floor(($distance % $minute) / $second);
            
            var $time_string = '';
            
            if($days > 0) {
                $time_string = $time_string + $days + ' Day(s) ';
            }
            
            if($hours > 0) {
                $time_string = $time_string + $hours + ' Hour(s) ';
            }
            
            if($minutes > 0) {
                $time_string = $time_string + $minutes + ' Minute(s) ';
            }
            
            if($seconds > 0) {
                $time_string = $time_string + $seconds + ' Second(s)';
            }
            
            $this.find('time').text($time_string);
        });
    }, 1000);
});