commit 5c7aa56a7cf9df486609fa58adf3d2a72fc5956f
Author: Joel Pittet <joel@pittet.ca>
Date:   Sun May 19 16:58:02 2013 -0700

    removed drupal_render_children as per #1920886 and new Attribute() as per #1982024

diff --git a/core/modules/datetime/datetime.module b/core/modules/datetime/datetime.module
index b949318..89ce482 100644
--- a/core/modules/datetime/datetime.module
+++ b/core/modules/datetime/datetime.module
@@ -324,20 +324,17 @@ function datetime_date_default_time($date) {
  * @see form_process_datetime()
  */
 function template_preprocess_datetime_form(&$variables) {
-
   $element = $variables['element'];
 
-  $attributes = array();
   if (isset($element['#id'])) {
-    $attributes['id'] = $element['#id'];
+    $variables['attributes']['id'] = $element['#id'];
   }
   if (!empty($element['#attributes']['class'])) {
-    $attributes['class'] = (array) $element['#attributes']['class'];
+    $variables['attributes']['class'] = (array) $element['#attributes']['class'];
   }
-  $attributes['class'][] = 'container-inline';
+  $variables['attributes']['class'][] = 'container-inline';
 
-  $variables['content'] = drupal_render_children($element);
-  $variables['attributes'] = new Attribute($attributes);
+  $variables['content'] = $element;
 }
 
 /**
@@ -352,20 +349,17 @@ function template_preprocess_datetime_form(&$variables) {
  *     #attributes.
  */
 function template_preprocess_datelist_form(&$variables) {
-
   $element = $variables['element'];
 
-  $attributes = array();
   if (isset($element['#id'])) {
-    $attributes['id'] = $element['#id'];
+    $variables['attributes']['id'] = $element['#id'];
   }
   if (!empty($element['#attributes']['class'])) {
-    $attributes['class'] = (array) $element['#attributes']['class'];
+    $variables['attributes']['class'] = (array) $element['#attributes']['class'];
   }
-  $attributes['class'][] = 'container-inline';
+  $variables['attributes']['class'][] = 'container-inline';
 
-  $variables['content'] = drupal_render_children($element);
-  $variables['attributes'] = new Attribute($attributes);
+  $variables['content'] = $element;
 }
 
 /**
diff --git a/core/modules/datetime/templates/datelist-form.html.twig b/core/modules/datetime/templates/datelist-form.html.twig
index 88f5c32..7e30eb0 100644
--- a/core/modules/datetime/templates/datelist-form.html.twig
+++ b/core/modules/datetime/templates/datelist-form.html.twig
@@ -4,7 +4,7 @@
  * Default theme implementation of a datelist form element.
  *
  * Available variables:
- * - attributes: Remaining HTML attributes for the datelist form element.
+ * - attributes: HTML attributes for the datelist form element.
  * - content: The datelist form element to be output.
  *
  * @see template_preprocess()
diff --git a/core/modules/datetime/templates/datetime-form.html.twig b/core/modules/datetime/templates/datetime-form.html.twig
index ff321d5..6a66c4c 100644
--- a/core/modules/datetime/templates/datetime-form.html.twig
+++ b/core/modules/datetime/templates/datetime-form.html.twig
@@ -4,7 +4,7 @@
  * Default theme implementation of a datetime form element.
  *
  * Available variables:
- * - attributes: Remaining HTML attributes for the datetime form element.
+ * - attributes: HTML attributes for the datetime form element.
  * - content: The datelist form element to be output.
  *
  * @see template_preprocess()
diff --git a/core/modules/datetime/templates/datetime-wrapper.html.twig b/core/modules/datetime/templates/datetime-wrapper.html.twig
index 295bf2f..d891817 100644
--- a/core/modules/datetime/templates/datetime-wrapper.html.twig
+++ b/core/modules/datetime/templates/datetime-wrapper.html.twig
@@ -6,7 +6,7 @@
  * Available variables:
  * - content: The form element to be output, usually a datelist, or datetime.
  * - title: The title of the form element.
- * - attributes: Remaining HTML attributes for the form wrapper.
+ * - attributes: HTML attributes for the form wrapper.
  * - required: (optional) A marker indicating that the form element is required.
  *
  * @see template_preprocess()