2

<script>
    const endTime = <?=$vars['expiration_time']?>;
    var countdown = setInterval(function(){
        var current = Math.round(new Date().getTime()/1000);
        if(current > endTime){
            $("#label-time").text("00:00");
            $(".timer").addClass("red_alert");
            $('#time_alert_modal').modal('show');
            clearInterval(countdown);
        }else{
            var label_time = new Date( (endTime - current)  * 1000).toISOString().substr(14, 5);
            $("#label-time").text(label_time);
        }
        
    },1000);
</script>