exclude weekends in javascript date calculation

Question

I have two sets of codes that work. Needed help combining them into one.

This code gets me the difference between two dates. works perfectly:

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Answer 1

@RobG has given an excellent algorithm to separate business days from weekends. I think the only problem is if the starting days is a weekend, Saturday or Sunday, then the no of working days/weekends will one less.

Corrected code is below.

function dateDifference(start, end) {

  // Copy date objects so don't modify originals

  var s = new Date(start);
  var e = new Date(end);

    var addOneMoreDay = 0;
    if( s.getDay() == 0 || s.getDay() == 6 ) {
    addOneMoreDay = 1;
  }

  // Set time to midday to avoid dalight saving and browser quirks
  s.setHours(12,0,0,0);
  e.setHours(12,0,0,0);

  // Get the difference in whole days
  var totalDays = Math.round((e - s) / 8.64e7);

  // Get the difference in whole weeks
  var wholeWeeks = totalDays / 7 | 0;

  // Estimate business days as number of whole weeks * 5
  var days = wholeWeeks * 5;

  // If not even number of weeks, calc remaining weekend days
  if (totalDays % 7) {
    s.setDate(s.getDate() + wholeWeeks * 7);

    while (s < e) {
      s.setDate(s.getDate() + 1);

      // If day isn't a Sunday or Saturday, add to business days
      if (s.getDay() != 0 && s.getDay() != 6) {
        ++days;
      }
      //s.setDate(s.getDate() + 1);
    }
  }
  var weekEndDays = totalDays - days + addOneMoreDay;
  return weekEndDays;
}

JSFiddle link is https://jsfiddle.net/ykxj4k09/2/