class Chronic::RepeaterHour

def next(pointer)
  super
  unless @current_hour_start
    case pointer
    when :future
      @current_hour_start = Chronic.construct(@now.year, @now.month, @now.day, @now.hour + 1)
    when :past
      @current_hour_start = Chronic.construct(@now.year, @now.month, @now.day, @now.hour - 1)
    end
  else
    direction = pointer == :future ? 1 : -1
    @current_hour_start += direction * HOUR_SECONDS
  end
  Span.new(@current_hour_start, @current_hour_start + HOUR_SECONDS)
end