The getMonth() method returns the month portion of the Date object expressed as an integer from 0 (January) to 11 (December).
<html>
<head>
<title>Current Month</title>
</head>
<body>
<script language="JavaScript" type="text/javascript">
<!--
var current_date = new Date();
month_value = current_date.getMonth();
document.write("Current Month is " + month_value);
//-->
</script>
</body>
</html>