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<?php
    date_default_timezone_set('11111111111');
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

    <script
        src="https://code.jquery.com/jquery-3.4.1.min.js"
        integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
        crossorigin="anonymous"></script>
    <script src="script.js"></script>
</head>
<body>
    <div id="timer"></div>

    <script type="text/javascript">
        var endDate = new Date(2019, 10 - 1, 18, 0, 0, 0);
        endDate = endDate.getTime() / 1000;
        console.log('endDate ' + endDate);
        console.log(new Date(endDate * 1000));
        var currentDate = <?php echo time(); ?>;
        console.log('currentDate ' + currentDate);
        console.log(new Date(currentDate * 1000));
        $('#timer').countdown(endDate, currentDate);
    </script>
</body>
</html>

$.fn.countdown = function(endDate, currentDate) {
    var delta = endDate - currentDate;
    console.log('-- endDate ' + endDate);
    console.log('-- currentDate ' + currentDate);
    console.log('-- delta ' + delta);

    var counter = function() {
        delta--;
        var date = new Date();
        date.setTime(delta * 1000);
        console.log('123 ' + delta);
        var day = delta <= 0 ? 0 : date.getUTCDate();
        console.log(delta <= 0);
        $('#timer').html(day + 'дн ' + date.getUTCHours() + ':' + date.getUTCMinutes() + ':' + date.getUTCSeconds());
    };

    setInterval(counter, 1000);
}