Simple Clock

jQuery Powered

by Slash

HTML

<span class="clock"></span>

JavaScript

jQuery(function($) {
  setInterval(function() {
    var d = new Date();
    var t = d.getTime();
    var interval = 5*60*1000;
    var last = t - t % interval;
    var next = last + interval + 5*60000;
    d.setTime(next);
    var time = d.toLocaleTimeString();
    $(".clock").html(time);
  }, 1000);
});