2 files changed, 1 insertions, 16 deletions
diff --git a/actionview/lib/action_view/helpers/tags/datetime_field.rb b/actionview/lib/action_view/helpers/tags/datetime_field.rb
index b2cee9d198..b3940c7e44 100644
--- a/actionview/lib/action_view/helpers/tags/datetime_field.rb
+++ b/actionview/lib/action_view/helpers/tags/datetime_field.rb
@@ -14,7 +14,7 @@ module ActionView
         private
 
           def format_date(value)
-            value.try(:strftime, "%Y-%m-%dT%T.%L%z")
+            raise NotImplementedError
           end
 
           def datetime_value(value)
diff --git a/actionview/lib/action_view/helpers/tags/file_field.rb b/actionview/lib/action_view/helpers/tags/file_field.rb
index e6a1d9c62d..476b820d84 100644
--- a/actionview/lib/action_view/helpers/tags/file_field.rb
+++ b/actionview/lib/action_view/helpers/tags/file_field.rb
@@ -2,21 +2,6 @@ module ActionView
   module Helpers
     module Tags # :nodoc:
       class FileField < TextField # :nodoc:
-
-        def render
-          options = @options.stringify_keys
-
-          if options.fetch("include_hidden", true)
-            add_default_name_and_id(options)
-            options[:type] = "file"
-            tag("input", name: options["name"], type: "hidden", value: "") + tag("input", options)
-          else
-            options.delete("include_hidden")
-            @options = options
-
-            super
-          end
-        end
       end
     end
   end