[FotGOD]

Всем привет. Подскажите в чем проблема, где ошибки. Код не хочет работать.

<div class="container">
	<h2>Home Work 2</h2>
	<div class="box hide"></div>
	<div id="showtime">00:00</div>
    <button id="start" class="btn btn-primary">START</button>
    <br>
    <br>
    <form name="form">
    <div>
           Day: <input id='day_id'>
    </div>
    <div>
           hours: <input id='hour_id'>
    </div>
    <div>
           minutes: <input id='minute_id'>
    </div>
   

</form>

</div>

function  timer(){
        let day= getElementById('day_id').value;
        let hour=getElementById('hour_id').value;
        let  minute=getElementById('minute_id').value;
        let second=59;
      const now = new Date()
          , newTime = new Date(now.getFullYear()+ 1, 0, 1)
          ,  diff = newTime.getTime() - now.getTime()
          , days = day
          , hours = hour
          , minutes = minute
          , seconds = 59 - now.getSeconds()
      ;

      let st = '';
      if(diff <= 0) {
          st  = window.open("http://google.com");
       } else {
        st=`${days} days, ${hours} hours,${minutes}minutes,${seconds}seconds`;
      }
document.getElementById('start').addEventListener('click', timer);

      document.getElementById("showtime").innerHTML = st;
      setTimeout(timer, 1000);
  }
  timer();