clock.js

var $dOut = $('#dateToday'),
    $hOut = $('#hours'),
    $mOut = $('#minutes'),
    $sOut = $('#seconds'),
    $ampmOut = $('#ampm');
var months = [
  'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'
];

var days = [
  'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'
];

function update(){
  var date = new Date();

  var ampm = date.getHours() < 12
             ? 'AM'
             : 'PM';

  var hours = date.getHours() == 0
              ? 12
              : date.getHours() > 12
                ? date.getHours() - 12
                : date.getHours();

  var minutes = date.getMinutes() < 10
                ? '0' + date.getMinutes()
                : date.getMinutes();

  var seconds = date.getSeconds() < 10
                ? '0' + date.getSeconds()
                : date.getSeconds();

  var dayOfWeek = days[date.getDay()];
  var month = months[date.getMonth()];
  var day = date.getDate();

  var dateString = dayOfWeek + ', ' + month + ' ' + day;

  $dOut.text(dateString);
  $hOut.text(hours +":");
  $mOut.text(minutes +":");
  $sOut.text(seconds);
  $ampmOut.text(ampm) ;
}

update();
window.setInterval(update, 1000);