# File lib/action_view/helpers/date_helper.rb, line 449
      def select_day(date, options = {}, html_options = {})
        val = date ? (date.kind_of?(Fixnum) ? date : date.day) : ''
        if options[:use_hidden]
          hidden_html(options[:field_name] || 'day', val, options)
        else
          day_options = []
          1.upto(31) do |day|
            day_options << ((val == day) ?
              content_tag(:option, day, :value => day, :selected => "selected") :
              content_tag(:option, day, :value => day)
            )
            day_options << "\n"
          end
          select_html(options[:field_name] || 'day', day_options.join, options, html_options)
        end
      end