setInterval(function(){
  
  var time = new Date();
  
  var second = time.getSeconds();
  var secondHand = second * 6;
  document.querySelector('.second').style.transform = 'rotate(' + secondHand + 'deg)';
  
  var minute = time.getMinutes();
  var minuteHand = minute * 6;
  document.querySelector('.minute').style.transform = 'rotate(' + minuteHand + 'deg)';
  
  var hour = time.getHours() % 12;
  var hourHand = hour * 30;
  document.querySelector('.hour').style.transform = 'rotate(' + hourHand + 'deg)';
  
}, 1000);