Here is a example how to show the date when you click on the button through a javascript.
Code:-
<html><head>
<script type=”text/javascript”>
function displayDate()
{
document.getElementById(“hightech”).innerHTML=Date();
}
</script>
</head>
<body> <h1>My First Web Page</h1>
<p id=”hightech”>Hightechnology.</p> <button type=”button” onclick=”displayDate()”>Display Date</button> </body>
</html>
Change accoding to your requirement.