# File lib/ice_cube/validations/day_of_year.rb, line 5
    def day_of_year(*days)
      days.flatten.each do |day|
        unless day.is_a?(Integer)
          raise ArgumentError, "expecting Integer value for day, got #{day.inspect}"
        end
        validations_for(:day_of_year) << Validation.new(day)
      end
      clobber_base_validations(:month, :day, :wday)
      self
    end