<h1> Test time:</h1>
<div id="timestampdiffseconds">1</div>

<h1>
My time: 
</h1>
<p id="myTime">
</p>

$(document).ready(function() {
    Date1 = 1535414400000;
  Date2 = new Date().getTime();
  
  startTime = new Date('2023-07-17T02:27:01.907Z');
  endTime = new Date('2023-07-17T02:39:30.678Z');
  
  let timeDiff = endTime - startTime;

    var secdiff = Date2 - Date1;


    $('#timestampdiffseconds').html(Date1 + ' - ' + Date2 + ' = ' + secdiff/1000/60/60/24 + ' seconds');
    
    var differenceValue = (startTime.getTime() - endTime.getTime()) / 1000;
    let minutes = Math.abs(Math.round(differenceValue/60));
    let seconds =  Math.abs(Math.round(differenceValue%60));
    $('#myTime').html(minutes + ' minutes ' + seconds +' seconds')
});