const duration=seconds_left;var countDownDate=new Date().getTime()+duration*1000;var x=setInterval(function(){var now=new Date().getTime();var distance=countDownDate-now;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);if(document.getElementById("time")!==null&&hours<1){document.getElementById("time").innerHTML=minutes+":"+((seconds<10)?"0"+seconds:seconds)}else if(hours>=1){document.getElementById("time").innerHTML=hours+":"+minutes+":"+((seconds<10)?"0"+seconds:seconds)}
if(distance<=1){clearInterval(x);timeExpired()}},3);function timeExpired(){window.location.replace("quiz.php");unset($_SESSION.start_time)}