PHP JavaScript: countdown timer

<html>

<head>
    <style type="text/css">
        body{
            text-align: center;
            font-family: sans-serif;
            font-weight: 100;

        }

        h1{
            color: #b53e0f;
            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: 19px;
            background: #2b0a26;
            display: inline-block;
        }
        #clockdiv div > span{
            padding: 15px;
            border-radius: 20px;
            background: #00816A;
            display: inline-block;
        }
        .smalltext{
            padding-top: 5px;
            font-size: 16px;
        }
    </style>
</head>

<body>
<h1>Countdown Clock</h1>
<div id="clockdiv">
<div>
<span class="days"></span>
<div class="smalltext">Days</div>
</div>
<div>
<span class="hours"></span>
<div class="smalltext">Hours</div>
</div>
<div>
<span class="minutes"></span>
<div class="smalltext">Minutes</div>
</div>
<div>
<span class="seconds"></span>
<div class="smalltext">Seconds</div>
</div>
</div>
<script type="text/javascript">
var deadline = 'December 31 2018';


// Convert time to usable format


function getTimeRemaining(deadline) {
var t = Date.parse(deadline) - 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 Clock(id, deadline) {
var clock = document.getElementById(id);

// The query selector method only returns the first element that matches

 the specified selectors.

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(deadline);
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);
 }

 Clock('clockdiv', deadline);

</script>

</body>
</html>

Output:

PHP JavaScript

Countdown Timer Using HTML, CSS, JAVASCRIPT

<html>

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