JSFiddle - React, Tailwind, and code Playground

JavaScript

var cellvalue="2011-08-18 11:49:01.0 IST";
var firstDate = new Date();
var secondDate = cellvalue.substring(0, cellvalue.length-4);
alert(diffOf2Dates(firstDate,secondDate));
function diffOf2Dates(todaysDate,configDate)
{
    /*var udate="2011-08-18 11:49:01.0";
    var configDate=new Date(udate);*/

    var oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
    var firstDate = todaysDate; // Todays date
    var secondDate = new Date(configDate);

    var diffDays = Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay));
    console.info(firstDate+", "+secondDate);
    //console.info(Math.ceil(diffDays));
    
    return Math.ceil(diffDays);
}