# File lib/ice_cube/validations/weekly_interval.rb, line 5
    def interval(interval, week_start = :sunday)
      @interval = normalized_interval(interval)
      @week_start = TimeUtil.wday_to_sym(week_start)
      replace_validations_for(:interval, [Validation.new(@interval, week_start)])
      clobber_base_validations(:day)
      self
    end