Moment JS playground.

by gbos

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<p id="output"></p>

JavaScript

const out = document.getElementById('output');

const idleTimeLimit = 3600;

const lastActivity = moment('2023-01-17T10:00:00');
const limit = moment(lastActivity).add(idleTimeLimit, 's').add(-4, 'm');


//const now = moment(Date.now());


out.innerText = limit.format('HH:mm:ss');