function Clock (ID) {
    // cache 'this'
    var _this = this;
    // ID-selector for clock
    _this.id = ID;
    _this.element = document.getElementById(_this.id);
    _this.day = _this.element.querySelectorAll('.day')[0];
    _this.seconds = _this.element.querySelectorAll('.seconds')[0];
    _this.minutes = _this.element.querySelectorAll('.minutes')[0];
    _this.hours = _this.element.querySelectorAll('.hours')[0];
    // get the currentDate
    _this.now = function(){
      return new Date();
    };
    // get date-parts
    _this.currentSecond = function() {
      return _this.now().getSeconds()
    }
    _this.currentMinute = function() {
      return _this.now().getMinutes()
    }
    _this.currentHour = function() {
      return this.now().getHours()
    }
    _this.currentDay = function() {
      return _this.now().getDate()
    }
    _this.currentMonth = function() {
      return _this.now().getMonth()+1
    }
    _this.currentYear = function() {
      return _this.now().getFullYear()
    }
    
    // run the clock
    _this.run = function() { 
      try {
        // try to apply actions

        var normalize = -90;
        var hrs = 12;
        var mins = 60;
        var secs = 60;
        var hDeg = 360 / hrs;
        var mDeg = 360 / mins;
        var sDeg = 360 / secs;

        // provide a function to rerun
        var tick = function(){
          _this.seconds.style.transform = '' +
            'rotate(' +
            (normalize + sDeg * _this.currentSecond()) +
            'deg)';
          _this.minutes.style.transform = '' +
            'rotate(' +
            (normalize + mDeg * _this.currentMinute()) +
            'deg)';
          _this.hours.style.transform = '' +
            'rotate(' +
            (normalize + hDeg * _this.currentHour() +
             hDeg / mins * _this.currentMinute()) +
            'deg)';
          _this.day.innerText = _this.currentDay();
          
          // rerun
          requestAnimationFrame(tick);
        };
        
        // start ticking
        requestAnimationFrame(tick);
      } catch(err) {
        // otherwise display an error
        console.error(err.message);
        return;
      }
    };
    // run on init
    _this.run();
}

// create a new clock
var clock = new Clock('clock-1');