OTROS/cuenta-atras.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Cuenta Atras!</title>

<style type="text/css">
body{
	text-align: center;
	background: #00B5AC;
  font-family: sans-serif;
  font-weight: 100;
}

h1{
  color: #fff;
  font-weight: 100;
  font-size: 40px;
  margin: 40px 0px 20px;
}

#clockdiv{
	font-family: sans-serif;
	color: #fff;
	display: inline-block;
	font-weight: 100;
	text-align: center;
	font-size: 30px;
}

#clockdiv > div{
	padding: 10px;
	border-radius: 3px;
	background: #319691;
	display: inline-block;
}

#clockdiv div > span{
	padding: 15px;
	border-radius: 3px;
	background: #085e5a;
	display: inline-block;
}

.smalltext{
	padding-top: 5px;
	font-size: 16px;
}
</style>
</head>
<body>

<h1>Master JavaScript</h1>
<div id="clockdiv">
  <div>
    <span class="days"></span>
    <div class="smalltext">Dias</div>
  </div>
  <div>
    <span class="hours"></span>
    <div class="smalltext">Horas</div>
  </div>
  <div>
    <span class="minutes"></span>
    <div class="smalltext">Minutos</div>
  </div>
  <div>
    <span class="seconds"></span>
    <div class="smalltext">Segundos</div>
  </div>
</div>


<script type="text/javascript">

function getTimeRemaining(endtime) {
  var t = Date.parse(endtime) - Date.parse(new Date());
  var seconds = Math.floor((t / 1000) % 60);
  var minutes = Math.floor((t / 1000 / 60) % 60);
  var hours = Math.floor((t / (1000 * 60 * 60)) % 24);
  var days = Math.floor(t / (1000 * 60 * 60 * 24));
  return {
    'total': t,
    'days': days,
    'hours': hours,
    'minutes': minutes,
    'seconds': seconds
  };
}

function initializeClock(id, endtime) {
  var clock = document.getElementById(id);
  var daysSpan = clock.querySelector('.days');
  var hoursSpan = clock.querySelector('.hours');
  var minutesSpan = clock.querySelector('.minutes');
  var secondsSpan = clock.querySelector('.seconds');

  function updateClock() {
    var t = getTimeRemaining(endtime);

    daysSpan.innerHTML = t.days;
    hoursSpan.innerHTML = ('0' + t.hours).slice(-2);
    minutesSpan.innerHTML = ('0' + t.minutes).slice(-2);
    secondsSpan.innerHTML = ('0' + t.seconds).slice(-2);

    if (t.total <= 0) {
      clearInterval(timeinterval);
    }
  }

  updateClock();
  var timeinterval = setInterval(updateClock, 1000);
}

var deadline = new Date(2018, 6, 4, 19, 0, 0, 0);
initializeClock('clockdiv', deadline);

</script>

</body>
</html>