JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" value="10-10-2015 20:00:08" id="startDateVal"/>
<input type="text" value="11-10-2015 23:00:10" id="lpoendDate_1"/>

JavaScript

var startDateVal = $("#lpostartDate_1").val()
 var  endDateVal= $("#lpoendDate_1").val()
    
  var testresult = (new Date(endDateVal) - new Date(startDateVal) ) / 1000 / 60 / 60;
    
    alert(testresult);