How To Make This Javascript Functions To Actually Gather Server Time And Countdown Until Event Starts Instead Of Browser/client Time?

As the title says I am not really good on that and I am struggling how to make that when the event timers are launched it will countdown until event starts getting the time from th

Solution 1:

<?php
$d = date('D M d Y H:i:s O');
echo "
<script>
var currdate = new Date($d);
</script>
";
?>