# File app/models/timeslot.rb, line 172
  def during_conference_days
    conf = self.conference
    return true if start_time.to_date.between?(conf.begins,
                                               conf.finishes)
    errors.add(:start_time, _('Must start within the conference dates ' +
                              '(%s - %s)') % [conf.begins, conf.finishes])
  end