JSFiddle - React, Tailwind, and code Playground

HTML

<div id="countup">
  It's been
  <p id="days">00</p>
  <p class="timeRefDays">days</p>
  <p id="hours">00</p>
  <p class="timeRefHours">hours</p>
  <p id="minutes">00</p>
  <p class="timeRefMinutes">minutes</p>
  <p id="seconds">00</p>
  <p class="timeRefSeconds">second</p>
</div>
<div id="geld">
  You've wasted:
  $
  <p id="Cents">00</p>
  <p class="timeRefCents"></p>
  of your employer's money
</div>

CSS

#countup p {
display: inline-block;
padding: 5px;
background: #FF111100;
margin: 0 0 20px;
}

#geld p {
display: inline-block;
padding: 5px;
background: #FF0000;
margin: 0 0 20px;
}

JavaScript

/*
* Basic Count Up from Date and Time
* Author: @mrwigster / trulycode.com
*/
window.onload=function() {
  // Month,Day,Year,Hour,Minute,Second
//  upTime('jan,01,2017,00:00:00'); // ****** Change this line example 'jan,01,2017,00:00:00'!
   var month = new Array("jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec");
   var today = new Date();
   var hrs = today.getHours();
   var min = today.getMinutes();  
   var sec = today.getSeconds();
   var dd = today.getDate();
   var mm = today.getMonth();
   var currentMonth = month[mm];
   var yyyy = today.getFullYear();
   today = currentMonth + ',' + dd + ',' + yyyy + ',' + hrs + ':' + min + ':' + sec;
   upTime(today);
}


var SalaryAnnual = prompt("Please enter your Annual Salary", "50000");


function upTime(countTo) {

  SalaryWeekly= SalaryAnnual/52;
  SalaryHourly= SalaryWeekly/40;
  SalaryMinute= SalaryHourly/60;
  SalarySecond= SalaryMinute/60;
  SalaryMillisecond= SalarySecond/1000;

  now = new Date();
  countTo = new Date(countTo);
  difference = (now-countTo);
  
  days=Math.floor(difference/(60*60*1000*24)*1);
  hours=Math.floor((difference%(60*60*1000*24))/(60*60*1000)*1);
  mins=Math.floor(((difference%(60*60*1000*24))%(60*60*1000))/(60*1000)*1);
  secs=Math.floor((((difference%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1);
  secsinfinite=(((difference%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1;
  
  salarysec=((difference/1000) * SalarySecond).toFixed(2);
  salarydol=(((difference/1000) * SalarySecond)/100).toFixed(2);


  document.getElementById('countup').setAttribute("uptime",days+':'+hours+':'+mins+':'+secs)
  document.getElementById('days').firstChild.nodeValue = days;
  document.getElementById('hours').firstChild.nodeValue = hours;
  document.getElementById('minutes').firstChild.nodeValue = mins;
  document.getElementById('seconds').firstChild.nodeValue = secs;
//  document.getElementById('Dollars').firstChild.nodeValue = SalarySec;
 ...