Calculating Work Days In Java

CalculateDuration.java

public static int calculateDuration(Date startDate, Date endDate)
{
  Calendar startCal = Calendar.getInstance();
  startCal.setTime(startDate);

  Calendar endCal = Calendar.getInstance();
  endCal.setTime(endDate);

  int workDays = 0;

  if (startCal.getTimeInMillis() > endCal.getTimeInMillis())
  {
    startCal.setTime(endDate);
    endCal.setTime(startDate);
  }

  do
  {
    startCal.add(Calendar.DAY_OF_MONTH, 1);
    if (startCal.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY && startCal.get(Calendar.DAY_OF_WEEK) != Calendar.SUNDAY)
    {
      workDays++;
    }
  }
  while (startCal.getTimeInMillis() <= endCal.getTimeInMillis());

  return workDays;
}

CalculateEndDate.java

public static Date calculateEndDate(Date startDate, int duration)
{		
  Calendar startCal = Calendar.getInstance();

  startCal.setTime(startDate);
		
  for (int i = 1; i < duration; i++)
  {
    startCal.add(Calendar.DAY_OF_MONTH, 1);
    while (startCal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY || startCal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY)
    {
      startCal.add(Calendar.DAY_OF_MONTH, 1);
    }
  }

  return startCal.getTime();
}