JSFiddle - React, Tailwind, and code Playground

HTML

<div id="textBoxOne">
2016-09-20 20:00:00
</div>
<div id="textBoxTwo">
2016-09-23 20:31:00
</div>
<div id="ShowTimeBetweenDates">

</div>

JavaScript

var dateOne = document.getElementById("textBoxOne").innerHTML;
var dateTwo = document.getElementById("textBoxTwo").innerHTML;
var diff =  (new Date(dateOne) - new Date(dateTwo))
var totalHours = Math.floor(Math.abs(diff/ 3600 / 1000));
var totalMinutes = Math.abs(((diff % 86400000) % 3600000) / 60000); 
var showTimeDiff = document.getElementById("ShowTimeBetweenDates");
showTimeDiff.innerHTML = "Time Diff : " + totalHours + " : " + totalMinutes;