Use the Date.now() Method
You can simply use the JavaScript Date.now() method to generate the UTC timestamp in milliseconds (which is the number of milliseconds since midnight Jan 1, 1970).
The following example demonstrates how to get a timestamp and how to convert it back to the human-readable date and time format in JavaScript.
<script>
// Creating a timestamp
var timestamp = Date.now();
console.log(timestamp);
// Converting it back to human-readable date and time
var d = new Date(timestamp);
console.log(d);
</script>
