อยากได้ code นับเวลา แล้วเมื่อมีการเข้าจากอีกเว็บหนึ่งแล้วเวลาหยุด

<script>
var countDownDate = localStorage.getItem('startDate');
if (countDownDate) {
    countDownDate = new Date(countDownDate);
} else {
    countDownDate = new Date();
    localStorage.setItem('startDate', countDownDate);
}
// 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 = now - countDownDate.getTime();
 
    // 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="demo"
    document.getElementById("demo").innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
}, 1000);

//if(wan==0 && hour==0 && minute==3 && second==0){
              //  clearInterval(countDownDate);
</script>
<p id="demo"></p>