Tatsu

Hello, I want to do a countdown and put it in my website. I did a countdown but I have a problem, when I launch it, the seconds are freezing they are not anymore running... So the countdown is not in realtime anymore... I have to refresh in order to see the countdown running.
Here is what I did:

<div id="after">
    <span id="dhour"></span>:<span id="dmin"></span>:<span id="dsec"></span>
</div>
<div id="count2">Texte à afficher</div>
   
<div class="numbers" id="dday" hidden="true"></div>
<script>
var ladate = new Date("<?php
echo gmdate("Y-m-d\TH:i:s\Z");?>");
var year=ladate.getFullYear();
var month=ladate.getMonth()+1;
var day=ladate.getDate();
var hour=14;
var minute=20;
var tz=0;
 
var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");
 
function countdown(yr,m,d,hr,min){
theyear=yr;themonth=m;theday=d;thehour=hr;theminute=min;
var today= new Date("<?php
echo gmdate("Y-m-d\TH:i:s\Z");?>");
var todayy=today.getYear();
if (todayy < 1000) {todayy+=1900; }
 
var todaym=today.getMonth();
var todayd=today.getDate();
var todayh=today.getHours();
var todaymin=today.getMinutes();
var todaysec=today.getSeconds();
var todaystring1=montharray[todaym]+" "+todayd+", "+todayy+" "+todayh+":"+todaymin+":"+todaysec;
var todaystring=Date.parse(todaystring1)+(tz*1000*60*60);
var futurestring1=(montharray[m-1]+" "+d+", "+yr+" "+hr+":"+min);
var futurestring=Date.parse(futurestring1)-(today.getTimezoneOffset()*(1000*60));
var dd=futurestring-todaystring;
var dday=Math.floor(dd/(60*60*1000*24)*1);
var dhour=Math.floor((dd%(60*60*1000*24))/(60*60*1000)*1);
var dmin=Math.floor(((dd%(60*60*1000*24))%(60*60*1000))/(60*1000)*1);
var dsec=Math.floor((((dd%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1);
 
if(dday<=0&&dhour<=0&&dmin<=0&&dsec<=0){
document.getElementById('count2').style.display="inline";
document.getElementById('after').style.display="none";
document.getElementById('dday').style.display="none";
document.getElementById('dhour').style.display="none";
document.getElementById('dmin').style.display="none";
document.getElementById('dsec').style.display="none";
document.getElementById('days').style.display="none";
document.getElementById('hours').style.display="none";
document.getElementById('minutes').style.display="none";
document.getElementById('seconds').style.display="none";
return;}else {
document.getElementById('count2').style.display="none";
document.getElementById('dday').innerHTML=dday;
document.getElementById('dhour').innerHTML=dhour;
document.getElementById('dmin').innerHTML=dmin;
document.getElementById('dsec').innerHTML=dsec;
window.location.reload();
setTimeout("countdown(theyear,themonth,theday,thehour,theminute)",1000);}}
 
countdown(year,month,day,hour,minute);
</script>

Thank you.