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Java get difference days without weekends

DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
    Date date1 = df.parse("10/08/2013");
    Date date2 = df.parse("21/08/2013");
    Calendar cal1 = Calendar.getInstance();
    Calendar cal2 = Calendar.getInstance();
    cal1.setTime(date1);
    cal2.setTime(date2);

    int numberOfDays = 0;
    while (cal1.before(cal2)) {
        if ((Calendar.SATURDAY != cal1.get(Calendar.DAY_OF_WEEK))
           &&(Calendar.SUNDAY != cal1.get(Calendar.DAY_OF_WEEK))) {
            numberOfDays++;
        }
        cal1.add(Calendar.DATE,1);
    }
    System.out.println(numberOfDays);

Source: stackoverflow.com

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