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Digital Clock Using Javascript

Digital Clock Using Javascript


This tutorial focuses on the setTimeout function for javascript, using which we can set a interval to a span tag and make it like a working digital clock.

You can choose any tag in the HTML and force to refresh it on a set interval on its own, without making the page load or heavy using ajax calls to the server, below is the complete HTML code for a Digital Clock using javascript.


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <meta http-equiv="content-type" content="text/html; charset=windows-1250">
  <title>Digital Clock | Javascript</title>
  <script language="JavaScript" type="text/javascript">




    function showtime() {
      now=new Date();
      hour=now.getHours();
      min=now.getMinutes();
      sec=now.getSeconds();
    
    if (min<=9) { min="0"+min; }
    if (sec<=9) { sec="0"+sec; }
    if (hour>12) { hour=hour-12; add="pm"; }
    else { hour=hour; add="am"; }
    if (hour==12) { add="pm"; }
    
    time = ((hour<=9) ? "0"+hour : hour) + ":" + min + ":" + sec + " " + add;
    
    if (document.getElementById) { document.getElementById('theTime').innerHTML = time; }
    else if (document.layers) {
     document.layers.theTime.document.write(time);
     document.layers.theTime.document.close(); }
    
    setTimeout("showtime()", 1000);
    }
    window.onload = showtime;
    </script>
  </head>
  
  <body>
<span id="theTime" style="color:black; z-index:2; position:absolute; text-align:centre; font-family: arial; font-size: 60pt"></span>
  </body>
</html>






Happy Coding !!
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