Difference between two dates in business duration using ServiceNow schedule

var startDateTime = new GlideDateTime("2025-03-01 09:00:00");  //enter employee start date here
  // Instantiate a new GlideDateTime object which has the current date and time
var endDateTime = new GlideDateTime();
  var dur = new DurationCalculator();
  // Set 9-5 weekday schedule. This is the schedule used below with 8 business hours
  dur.setSchedule('a859c8c3e4e98500ea445bbba64fd9f8'); //enter your desired schedule sys_id
  dur.calcScheduleDuration(startDateTime, endDateTime);
  var secs = dur.getSeconds(); //Business time in secs
  var totalSecs = dur.getTotalSeconds();  //Total time in secs
  gs.print("***SCHEDULE DURATION: Business Days=" + Math.round(secs/(3600*8)) + " TOTAL Days=" + Math.round(totalSecs/(3600*24)) );