To get the current time in a millisecond, use the date getMilliseconds() method. JavaScript date getMilliseconds() method returns the milliseconds in the specified date according to local time. The value returned by getMilliseconds() is a number between 0 and 999.
Example
You can try to run the following code to get the current time in milliseconds −
<html>
<head>
<title>JavaScript getMilliseconds() Method</title>
</head>
<body>
<script>
var dt = new Date( );
document.write("getMilliseconds() : " + dt.getMilliseconds() );
</script>
</body>
</html>