JSFiddle - React, Tailwind, and code Playground

HTML

<span id="downtime">0</span>
<input type="button" id="recycle" value="recycle"/>

JavaScript

$().ready(function () {
    var initialDate = new Date();
    setInterval(function() {
        var currentDate = new Date();        
        $("#downtime").html("downtime: " + (currentDate - initialDate) + " milliseconds");
    }, 1000);
    
    $("#recycle").on("click", function () {
        initialDate = new Date();
    });
});