public Iterator<Seance> showNextSeances() {
    List<Seance> nextSeances = new ArrayList<Seance>();
    Calendar now = Calendar.getInstance();
    for (Seance seance : seances) {
      if (seance.getStartDateTime().after(now)) {
        nextSeances.add(seance);
      }
    }
    Collections.sort(nextSeances, new SeanceComparatorByDate());
    return nextSeances.iterator();
  }