select_day

# File actionpack/lib/action_view/helpers/date_helper.rb, line 692
      def select_day
        if @options[:use_hidden] || @options[:discard_day]
          build_hidden(:day, day)
        else
          build_options_and_select(:day, day, :start => 1, :end => 31, :leading_zeros => false)
        end
      end