(function($) {
    var humanizeTimestamps = function() {
        $('time[datetime]').each(function() {
            var $this = $(this);
            $this.text(moment($this.attr('datetime')).fromNow());
        });
    };
    humanizeTimestamps();
    window.setInterval(humanizeTimestamps, 15 * 1000);
})(jQuery);