var Watch = function() {
  var date = new Date;
  var hours = date.getHours();
  var minutes = date.getMinutes();
  var seconds = date.getSeconds();

  this.calcHours = function() {
    var hourWidth = 100 / 24; // 100% / 24horas
    document.getElementById('hours').style.width = hourWidth * hours + '%';
  };
  this.calcMinutes = function() {
    var minuteWidth = 100 / 59; // 100% / 59min
    var width = minuteWidth * minutes + '%';
    document.getElementById('minutes').style.width = width;
  };
  this.calcSeconds = function() {
    var secondWidth = 100 / 59; // 100% / 59sec
    var width = secondWidth * seconds + '%';
    document.getElementById('seconds').style.width = width;
  };
};
var interface = new Watch();
interface.calcHours();
interface.calcMinutes();
interface.calcSeconds();

setInterval(function() {
  var interface = new Watch();
  interface.calcMinutes();
  interface.calcSeconds();
}, 1000);