to_formatted_s (ActiveSupport::CoreExtensions::Date::Conversions)

    # File lib/active_support/core_ext/date/conversions.rb, line 53
            def to_formatted_s(format = :default)
              if formatter = DATE_FORMATS[format]
                if formatter.respond_to?(:call)
                  formatter.call(self).to_s
                else
                  strftime(formatter)
                end
              else
                to_default_s
              end
            end