def finish_time_f day
      if dtend.class == Date
        # whole day
        ""
      elsif finish_time.to_date == day.to_date
        finish_time.strftime('%H:%M')
      else
        return "..."
      end
    end
def finish_time_f day
      if dtend.class == Date
        # whole day
        ""
      elsif finish_time.to_date == day.to_date
        finish_time.strftime('%H:%M')
      else
        return "..."
      end
    end
Time it finishes at day, or '...'