Find the Saturdays and Sundays between 2 dates

Find the Saturdays and Sundays between 2 dates

function getWeekends(start, end) {
  var startDate = new Date(start);
  var endDate = new Date(end);
  var weekendDays = 0;

  while (startDate <= endDate) {
    var day = startDate.getDay()
    if (day == 0 || day == 6) {
        weekendDays++;
    }
    startDate.setDate(startDate.getDate() + 1)
  }
  console.log(weekendDays);
}

getWeekends('03/01/2020', '03/31/2020');