title: JS Countdown not working in IE and Safari
body: <p>I have a javascript countdown which doesn't seem to be working on IE nor on safari, all tested on windows 7, works fine with chrome and firefox. I'm not looking to change to a jQuery countdown due to certain restrictions on the website so really looking to get this working across all browsers.</p>
  
  <pre><code>    &lt;script language="JavaScript"&gt;
  TargetDate = "January/01/2014 12:00 am";
  BackColor = "";
  ForeColor = "#000";
  CountActive = true;
  CountStepper = -1;
  LeadingZero = true;
  DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
  FinishMessage = "&lt;span class='finish'&gt;Finished!&lt;/span&gt;";
  &lt;/script&gt;
  &lt;script language="javascript"&gt;
  function calcage(secs, num1, num2) {
    s = ((Math.floor(secs/num1))%num2).toString();
    if (LeadingZero &amp;&amp; s.length &lt; 2)
      s = "0" + s;
    return "&lt;span class='digit'&gt;" + s + "&lt;/span&gt;";
  }
  
  function CountBack(secs) {
    if (secs &lt; 0) {
      document.getElementById("cntdwn").innerHTML = FinishMessage;
      return;
    }
    DisplayStr = DisplayFormat.replace(/%%D%%/g, calcage(secs,86400,100000));
    DisplayStr = DisplayStr.replace(/%%H%%/g, calcage(secs,3600,24));
    DisplayStr = DisplayStr.replace(/%%M%%/g, calcage(secs,60,60));
    DisplayStr = DisplayStr.replace(/%%S%%/g, calcage(secs,1,60));
  
    document.getElementById("cntdwn").innerHTML = DisplayStr;
    if (CountActive)
      setTimeout("CountBack(" + (secs+CountStepper) + ")", SetTimeOutPeriod);
  }
  
  function putspan(backcolor, forecolor) {
   document.write("&lt;span id='cntdwn' style=' font-weight:bold; background-color:" + backcolor + 
                  "; color:" + forecolor + "'&gt; &lt;/span&gt;");
  }
  
  if (typeof(BackColor)=="undefined")
    BackColor = "white";
  if (typeof(ForeColor)=="undefined")
    ForeColor= "black";
  if (typeof(TargetDate)=="undefined")
    TargetDate = "12/31/2020 5:00 AM";
  if (typeof(DisplayFormat)=="undefined")
    DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
  if (typeof(CountActive)=="undefined")
    CountActive = true;
  if (typeof(FinishMessage)=="undefined")
    FinishMessage = "";
  if (typeof(CountStepper)!="number")
    CountStepper = -1;
  if (typeof(LeadingZero)=="undefined")
    LeadingZero = true;
  
  
  CountStepper = Math.ceil(CountStepper);
  if (CountStepper == 0)
    CountActive = false;
  var SetTimeOutPeriod = (Math.abs(CountStepper)-1)*1000 + 990;
  putspan(BackColor, ForeColor);
  var dthen = new Date(TargetDate);
  var dnow = new Date();
  if(CountStepper&gt;0)
    ddiff = new Date(dnow-dthen);
  else
    ddiff = new Date(dthen-dnow);
  gsecs = Math.floor(ddiff.valueOf()/1000);
  CountBack(gsecs);
  &lt;/script&gt;
  </code></pre>
  
  <p>Countdown just displays as NaN. Any help greatly appreciated.</p>