while (r.next()) {
    String rn = r.getString(3);
    String sqldate = r.getString(2); // database reservation date
}

Pobieranie daty z bazy danych

DateFormat RD = new SimpleDateFormat("yyyy-MM-dd");
     java.sql.Date converteddate = new java.sql.Date(RD.parse(sqldate).getTime());
     Calendar cal = Calendar.getInstance();
     Calendar cal1 = Calendar.getInstance();
     cal.setTime(converteddate);
     cal.add(Calendar.DATE, 7);
     if(cal<=cal1){ }// i need to this opration i dont know how

muszę sprawdzićcal jest <=Cal1. Jakieś pomysły?