<!DOCTYPE HTML>
<html>
<head>
<?php
$str = 'Tue Dec 15 2016';
$timestamp = strtotime($str); ?>
</head>
<body>
<span id="counter12"></span>
<script>
// self executing function here
(function () {
var seconds =<?=json_encode($timestamp);?>;
var interval = setInterval(runFunction, 1000);
var spCounter = document.getElementById("counter12");
function runFunction() {
spCounter.innerHTML = "Kalan Süre: " + --seconds;
if (seconds == 0)
clearInterval(interval);
}
})();
</script>
</body>
</html>