Javascript CountDown在Firefox上显示NaN

Question

I have been working on costum Javascript Countdown that retrieve start_date and end_date from localhost database.
The date count works correctly by Google Chrome, but in Firefox and Opera it just says NaN.

Here is my jquery with php. Can anybody tell me what's wrong with my code?

This is what shows on firefox and opera:

<?php

    include("connect.php");
    $query="select * from account where Account_No='".$_SESSION['Account_No']."' ";
    $rownum=mysql_query($query);


    while($row = mysql_fetch_array($rownum))
     {  
    $End_Time=$row['End_Time'];
     }
    $End = strtotime($End_Time); 
    $Year = date("y",$End);
    $Month = date("m",$End);
    $Day = date("d",$End);
    $Hour = date("H",$End);
    $Minute = date("i",$End); 
    ?>
    <script type="text/javascript" >
    var current="License has expired!";
    var year= <?php echo $Year; ?>;
    var month= <?php echo $Month; ?>;
    var day= <?php echo $Day; ?>;
    var hour= <?php echo $Hour; ?>;
    var minute= <?php echo $Minute; ?>;
    var tz=-5;



    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();
        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').innerHTML=current;
            document.getElementById('count2').style.display="inline";
            document.getElementById('count2').style.width="390px";
            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;
            setTimeout("countdown(theyear,themonth,theday,thehour,theminute)",1000);
        }
    }
    </script>

---

<?php
    echo "License will exprie after : <br>
    <div id='forms'>
        <div class='numbers' id='count2' style='position: absolute; top: 10px; height: 60px; padding: 15px 0 0 10px; background-color: #000000; z-index: 20;'></div>
        <img src='images/bkgdimage.gif' class='background' style='position: absolute; left: 69px; top: 12px;'/>
        <img src='images/line.jpg' class='line' style='position: absolute; left: 69px; top: 40px;'/> 
        <div class='numbers' id='dday' style='position: absolute; left: 69px; top: 21px;' ></div>

        <img src='images/bkgdimage.gif' class='background' style='position: absolute; left: 141px; top: 12px;'/>
        <img src='images/line.jpg' class='line' style='position: absolute; left: 141px; top: 40px;'/>
        <div class='numbers' id='dhour' style='position: absolute; left: 141px; top: 21px;' ></div>

        <img src='images/bkgdimage.gif' class='background' style='position: absolute; left: 213px; top: 12px;'/>
        <img src='images/line.jpg' class='line' style='position: absolute; left: 213px; top: 40px;'/>
        <div class='numbers' id='dmin' style='position: absolute; left: 213px; top: 21px;' ></div>

        <img src='images/bkgdimage.gif' class='background' style='position: absolute; left: 285px; top: 12px;'/>
        <img src='images/line.jpg' class='line' style='position: absolute; left: 285px; top: 40px;'/>
        <div class='numbers' id='dsec' style='position: absolute; left: 285px; top: 21px;' ></div>

        <div class='title' id='days' style='position: absolute; left: 66px; top: 73px;' >Days</div>
        <div class='title' id='hours' style='position: absolute; left: 138px; top: 73px;' >Hours</div>
        <div class='title' id='minutes' style='position: absolute; left: 210px; top: 73px;' >Minutes</div>
        <div class='title' id='seconds' style='position: absolute; left: 282px; top: 73px;' >Seconds</div>
    </div>";
?>

Answer 1

Firefox doesn't parse the date when year is in YY format. Use YYYY instead, so in your code you should replace

$Year = date("y",$End);

with

$Year = date("Y",$End);