calculate current from current time to past time in js code example

Example 1: js nwe date today

var today = new Date();
var dd = String(today.getDate()).padStart(2, '0');
var mm = String(today.getMonth() + 1).padStart(2, '0'); //January is 0!
var yyyy = today.getFullYear();

today = mm + '/' + dd + '/' + yyyy;
document.write(today);

Example 2: get current time in js

<script>

var today = new Date();

var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();

</script>