public void setBirthDay(Vet obj, int index) {
   Date birthDay =
       new GregorianCalendar(
               Calendar.getInstance().get(Calendar.YEAR),
               Calendar.getInstance().get(Calendar.MONTH),
               Calendar.getInstance().get(Calendar.DAY_OF_MONTH),
               Calendar.getInstance().get(Calendar.HOUR_OF_DAY),
               Calendar.getInstance().get(Calendar.MINUTE),
               Calendar.getInstance().get(Calendar.SECOND)
                   + new Double(Math.random() * 1000).intValue())
           .getTime();
   obj.setBirthDay(birthDay);
 }