1 files changed, 4 insertions, 2 deletions
diff --git a/actionview/lib/action_view/helpers/form_helper.rb b/actionview/lib/action_view/helpers/form_helper.rb
index c1015ffe89..7ced37572e 100644
--- a/actionview/lib/action_view/helpers/form_helper.rb
+++ b/actionview/lib/action_view/helpers/form_helper.rb
@@ -1118,6 +1118,10 @@ module ActionView
       #   # => <input id="user_born_on" name="user[born_on]" type="datetime" min="2014-05-20T00:00:00.000+0000" />
       #
       def datetime_field(object_name, method, options = {})
+        ActiveSupport::Deprecation.warn(<<-MESSAGE.squish)
+          datetime_field is deprecated and will be removed in Rails 5.1.
+          Use datetime_local_field instead.
+        MESSAGE
         Tags::DatetimeField.new(object_name, method, self, options).render
       end
 
@@ -1922,8 +1926,6 @@ module ActionView
             @object_name.to_s.humanize
           end
 
-          model = model.downcase
-
           defaults = []
           defaults << :"helpers.submit.#{object_name}.#{key}"
           defaults << :"helpers.submit.#{key}"