Countdown timer.

Countdown timer.

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="style.css">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style type="text/css">
      *{
  font-family: "montserrat",sans-serif;
}
body{
  margin: 0;
  padding: 0;
}
.page{
  background: #f1f1f1;
  display: flex;
  flex-wrap: wrap;
}
.col{
  flex: 1;
  height: 100vh;
  position: relative;
}
.countdown-col{
  background: url(bg.png) no-repeat center;
  background-size: cover;
}
.time{
  color: #fff;
  text-transform: uppercase;
  width: 90%;
  display: flex;
  justify-content: center;
}
.middle{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  text-align: center;
}
.time span{
  padding: 0 14px;
  font-size: 10px;
}
.time span div{
  font-size: 40px;
}

.newsletter{
  width: 90%;
}
.newsletter h4{
  font-style: italic;
  font-size: 12px;
}
.newsletter input{
  display: block;
  margin: 12px auto;
  width: 100%;
  max-width: 400px;
  box-sizing: border-box;
  padding: 14px 20px;
  border-radius: 30px;
  border: 1px solid #ddd;
  outline: none;
}
.newsletter-btn{
  background: linear-gradient(125deg,#3498db,#34495e);
  color: #fff;
  cursor: pointer;
  transition: 0.4s;
}
.newsletter-btn:hover{
  opacity: .7;
}

@media screen and (max-width :900px){
  .col{
    flex: 100%;
  }
}

    </style>
  </head>
  <body>
    <div class="page">
      <div class="countdown-col col">
        <div class="time middle">
          <span>
            <div id="d">12</div>
            Days
          </span>
          <span>
            <div id="h">06</div>
            Hours
          </span>
          <span>
            <div id="m">35</div>
            Minutes
          </span>
          <span>
            <div id="s">54</div>
            Seconds
          </span>
        </div>
      </div>
      <div class="newsletter-col col">
        <div class="newsletter middle">
          <h2>We Will Coming Soon</h2>
          <h4>Subscribe to get notification when we start</h4>
          <form action="">
            <input type="text" placeholder="Enter Your Email">
            <input class="newsletter-btn" type="button" value="Subscribe">
          </form>
        </div>
      </div>
    </div>
    <script src="countdown.js"></script>
    <script type="text/javascript">
      var comingdate = new Date("Jan 1, 2019 00:00:00");

var d = document.getElementById('d');
var h = document.getElementById('h');
var m = document.getElementById('m');
var s = document.getElementById('s');

var x = setInterval(function(){
  var now = new Date();
  var des = comingdate.getTime() - now.getTime();
  var days = Math.floor(des/(1000 * 60 * 60 * 24));
  var hours = Math.floor(des%(1000 * 60 * 60 * 24) / (1000 * 60 *60));
  var mins = Math.floor(des%(1000 * 60 * 60) / (1000 * 60));
  var secs = Math.floor(des%(1000 * 60) / 1000);

  d.innerHTML = getTrueNumber(days);
  h.innerHTML = getTrueNumber(hours);
  m.innerHTML = getTrueNumber(mins);
  s.innerHTML = getTrueNumber(secs);

  if(des <= 0) clearInterval(x);

},1000);

function getTrueNumber(x) {
  if (x<10) return '0'+x;
  else return x;
}

    </script>
  </body>
</html>