我想显示一个倒数计时器为即将到来的职位。我用JavaScript与PHP来实现它。我传递一个PHP变量值在JavaScript函数。你能看到的代码并帮助我吗？我的代码：

<span><i class="fa fa-calendar-o"></i> <?php echo get_the_date();?></span>
<?php $dtimer = get_the_date(); ?>
<span><i class='fa fa-calendar-o'></i><p id='timer-diff'></p></span> 
<script>                        
                // Set the date we're counting down to
                var countDownDate = new Date("<?php echo $dtimer; ?>").getTime();

                // Update the count down every 1 second
                var x = setInterval(function() {

                    // Get todays date and time
                    var now = new Date().getTime();

                    // Find the distance between now an the count down date
                    var distance = countDownDate - now;

                    // Time calculations for days, hours, minutes and seconds
                    var days = Math.floor(distance / (1000 * 60 * 60 * 24));
                    var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
                    var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
                    var seconds = Math.floor((distance % (1000 * 60)) / 1000);

                    // Output the result in an element with id="timer-diff"
                    document.getElementById("timer-diff").innerHTML = days + "d " + hours + "h "
                    + minutes + "m " + seconds + "s ";

                    // If the count down is over, write some text 
                    if (distance < 0) {
                        clearInterval(x);
                        document.getElementById("timer-diff").innerHTML = "EXPIRED";
                    }
                }, 1000);
                </script>

image attached