diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
new file mode 100644
index 0000000..6861a00
--- /dev/null
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Field\Plugin\Field\FieldFormatter\TimestampFormatter.
+ */
+
+namespace Drupal\Core\Field\Plugin\Field\FieldFormatter;
+
+use Drupal\Core\Field\FormatterBase;
+use Drupal\Core\Field\FieldItemListInterface;
+
+/**
+ * Plugin implementation of the 'timestamp' formatter.
+ *
+ * @FieldFormatter(
+ *   id = "timestamp",
+ *   label = @Translation("Default"),
+ *   field_types = {
+ *     "timestamp",
+ *     "created",
+ *   }
+ * )
+ */
+class TimestampFormatter extends FormatterBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function viewElements(FieldItemListInterface $items) {
+    $elements = array();
+
+    foreach ($items as $delta => $item) {
+      $elements[$delta] = array('#markup' => format_date($item->value));
+    }
+
+    return $elements;
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/CreatedItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/CreatedItem.php
index 9b2e055..72c0ea9 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/CreatedItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/CreatedItem.php
@@ -14,7 +14,9 @@
  *   id = "created",
  *   label = @Translation("Created"),
  *   description = @Translation("An entity field containing a UNIX timestamp of when the entity has been created."),
- *   no_ui = TRUE
+ *   no_ui = TRUE,
+ *   default_widget = "timestamp",
+ *   default_formatter = "timestamp",
  * )
  */
 class CreatedItem extends TimestampItem {
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/TimestampItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/TimestampItem.php
index ba432e3..72f71a2 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/TimestampItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/TimestampItem.php
@@ -18,7 +18,9 @@
  *   id = "timestamp",
  *   label = @Translation("Timestamp"),
  *   description = @Translation("An entity field containing a UNIX timestamp value."),
- *   no_ui = TRUE
+ *   no_ui = TRUE,
+ *   default_widget = "timestamp",
+ *   default_formatter = "timestamp",
  * )
  */
 class TimestampItem extends FieldItemBase {
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php
new file mode 100644
index 0000000..17095ab
--- /dev/null
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php
@@ -0,0 +1,87 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Field\Plugin\Field\FieldWidget\TimestampWidget.
+ */
+
+namespace Drupal\Core\Field\Plugin\Field\FieldWidget;
+
+use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\WidgetBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Plugin implementation of the 'timestamp' widget.
+ *
+ * @FieldWidget(
+ *   id = "timestamp",
+ *   label = @Translation("Timestamp"),
+ *   field_types = {
+ *     "timestamp",
+ *     "created",
+ *   }
+ * )
+ */
+class TimestampWidget extends WidgetBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    return array(
+      'use_request_time_on_empty' => FALSE
+    ) + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
+    $default_value = isset($items[$delta]->value) ? format_date($items[$delta]->value, 'custom', 'Y-m-d H:i:s O') : '';
+    $element['value'] = $element + array(
+      '#type' => 'textfield',
+      '#default_value' => $default_value,
+      '#maxlength' => 25,
+      '#element_validate' => array(
+        array($this, 'elementValidate'),
+      ),
+    );
+
+    if (!empty($default_value)) {
+      $example_time = date_format(date_create($default_value), 'Y-m-d H:i:s O');
+      $timezone = date_format(date_create($default_value), 'O');
+    }
+    else {
+      $example_time = format_date(REQUEST_TIME, 'custom', 'Y-m-d H:i:s O');
+      $timezone = format_date(REQUEST_TIME, 'custom', 'O');
+    }
+    $element['value']['#description'] = $this->t('Format: %time. The date format is YYYY-MM-DD and %timezone is the time zone offset from UTC. Leave blank to use the time of form submission.', array('%time' => $example_time, '%timezone' => $timezone));
+
+    return $element;
+  }
+
+  /**
+   * Validates an element.
+   *
+   * @todo Convert to massageFormValues() after https://drupal.org/node/2226723 lands.
+   */
+  public function elementValidate($element, FormStateInterface $form_state, $form) {
+    $value = trim($element['#value']);
+    if (empty($value)) {
+      $value = $this->getSetting('use_request_time_on_empty') ? REQUEST_TIME : 0;
+    }
+    else {
+      $date = new DrupalDateTime($value);
+      if ($date->hasErrors()) {
+        $value = FALSE;
+      }
+      else {
+        $value = $date->getTimestamp();
+      }
+    }
+    form_set_value($element, $value, $form_state);
+  }
+
+}
diff --git a/core/modules/content_translation/src/ContentTranslationHandler.php b/core/modules/content_translation/src/ContentTranslationHandler.php
index 734ee5d..995cfbc 100644
--- a/core/modules/content_translation/src/ContentTranslationHandler.php
+++ b/core/modules/content_translation/src/ContentTranslationHandler.php
@@ -418,7 +418,7 @@ function entityFormValidate($form, FormStateInterface $form_state) {
       if (!empty($translation['name']) && !($account = user_load_by_name($translation['name']))) {
         form_set_error('content_translation][name', $form_state, t('The translation authoring username %name does not exist.', array('%name' => $translation['name'])));
       }
-      // Validate the "authored on" field.
+      // Validate the "created on" field.
       if (!empty($translation['created']) && strtotime($translation['created']) === FALSE) {
         form_set_error('content_translation][created', $form_state, t('You have to specify a valid translation authoring date.'));
       }
diff --git a/core/modules/datetime/config/schema/datetime.schema.yml b/core/modules/datetime/config/schema/datetime.schema.yml
index ef81fbf..08df7ee 100644
--- a/core/modules/datetime/config/schema/datetime.schema.yml
+++ b/core/modules/datetime/config/schema/datetime.schema.yml
@@ -75,3 +75,13 @@ entity_form_display.field.datetime_default:
       label: 'Settings'
       sequence:
         - type: string
+
+entity_form_display.field.datetime_timestamp:
+  type: entity_field_form_display_base
+  label: 'Datetime timestamp display format settings'
+  mapping:
+    settings:
+      type: sequence
+      label: 'Settings'
+      sequence:
+        - type: string
diff --git a/core/modules/datetime/datetime.module b/core/modules/datetime/datetime.module
index d0114e2..f30ae36 100644
--- a/core/modules/datetime/datetime.module
+++ b/core/modules/datetime/datetime.module
@@ -7,6 +7,7 @@
 
 use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\Core\Template\Attribute;
@@ -998,21 +999,13 @@ function datetime_range_years($string, $date = NULL) {
 }
 
 /**
- * Implements hook_form_BASE_FORM_ID_alter() for node forms.
+ * Implements hook_entity_base_field_info_alter().
  */
-function datetime_form_node_form_alter(&$form, FormStateInterface $form_state, $form_id) {
-  // Alter the 'Authored on' date to use datetime.
-  $form['created']['#type'] = 'datetime';
-  $date_format = entity_load('date_format', 'html_date')->getPattern();
-  $time_format = entity_load('date_format', 'html_time')->getPattern();
-  $form['created']['#description'] = t('Format: %format. Leave blank to use the time of form submission.', array('%format' => datetime_format_example($date_format . ' ' . $time_format)));
-  unset($form['created']['#maxlength']);
-}
-
-/**
- * Implements hook_node_prepare_form().
- */
-function datetime_node_prepare_form(NodeInterface $node, $operation, FormStateInterface $form_state) {
-  // Prepare the 'Authored on' date to use datetime.
-  $node->date = DrupalDateTime::createFromTimestamp($node->getCreatedTime());
+function datetime_entity_base_field_info_alter(&$fields, EntityTypeInterface $entity_type) {
+  if ($entity_type->id() == 'node') {
+    $fields['created']->setDisplayOptions('form', array(
+      'type' => 'datetime_timestamp',
+      'weight' => 0,
+    ));
+  }
 }
diff --git a/core/modules/datetime/src/Plugin/Field/FieldWidget/DateTimeTimestampWidget.php b/core/modules/datetime/src/Plugin/Field/FieldWidget/DateTimeTimestampWidget.php
new file mode 100644
index 0000000..b508954
--- /dev/null
+++ b/core/modules/datetime/src/Plugin/Field/FieldWidget/DateTimeTimestampWidget.php
@@ -0,0 +1,63 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\datetime\Plugin\Field\FieldWidget\DateTimeTimestampWidget.
+ */
+
+namespace Drupal\datetime\Plugin\Field\FieldWidget;
+
+use Drupal\Core\Datetime\DrupalDateTime;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\WidgetBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Plugin implementation of the 'datetime timestamp' widget.
+ *
+ * @FieldWidget(
+ *   id = "datetime_timestamp",
+ *   label = @Translation("Datetime Timestamp"),
+ *   field_types = {
+ *     "timestamp",
+ *     "created",
+ *   }
+ * )
+ */
+class DateTimeTimestampWidget extends WidgetBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
+    $date_format = entity_load('date_format', 'html_date')->getPattern();
+    $time_format = entity_load('date_format', 'html_time')->getPattern();
+    $default_value = isset($items[$delta]->value) ? DrupalDateTime::createFromTimestamp($items[$delta]->value) : '';
+    $element['value'] = $element + array(
+      '#type' => 'datetime',
+      '#default_value' => $default_value,
+      '#element_validate' => array(
+        array($this, 'elementValidate'),
+      ),
+    );
+    $element['value']['#description'] = $this->t('Format: %format. Leave blank to use the time of form submission.', array('%format' => datetime_format_example($date_format . ' ' . $time_format)));
+
+    return $element;
+  }
+
+  /**
+   * Validates an element.
+   *
+   * @todo Convert to massageFormValues() after https://drupal.org/node/2226723 lands.
+   */
+  public function elementValidate($element, FormStateInterface $form_state, $form) {
+    $date = $element['#value']['object'];
+    if ($date->hasErrors()) {
+      $value = -1;
+    }
+    else {
+      $value = $date->getTimestamp();
+    }
+    form_set_value($element, $value, $form_state);
+  }
+
+}
diff --git a/core/modules/entity/src/Tests/EntityDisplayTest.php b/core/modules/entity/src/Tests/EntityDisplayTest.php
index 1efa671..0fcb81d 100644
--- a/core/modules/entity/src/Tests/EntityDisplayTest.php
+++ b/core/modules/entity/src/Tests/EntityDisplayTest.php
@@ -285,19 +285,23 @@ public function testRenameDeleteBundle() {
     $this->assertEqual('article_rename', $new_form_display->bundle);
     $this->assertEqual('node.article_rename.default', $new_form_display->id);
 
-    $expected_dependencies = array(
+    $expected_view_dependencies = array(
+      'entity' => array('field.instance.node.article_rename.body', 'node.type.article_rename'),
+      'module' => array('text', 'user')
+    );
+    $expected_form_dependencies = array(
       'entity' => array('field.instance.node.article_rename.body', 'node.type.article_rename'),
       'module' => array('text')
     );
     // Check that the display has dependencies on the bundle, fields and the
     // modules that provide the formatters.
     $dependencies = $new_display->calculateDependencies();
-    $this->assertEqual($expected_dependencies, $dependencies);
+    $this->assertEqual($expected_view_dependencies, $dependencies);
 
     // Check that the form display has dependencies on the bundle, fields and
     // the modules that provide the formatters.
     $dependencies = $new_form_display->calculateDependencies();
-    $this->assertEqual($expected_dependencies, $dependencies);
+    $this->assertEqual($expected_form_dependencies, $dependencies);
 
     // Delete the bundle.
     $type->delete();
diff --git a/core/modules/entity_reference/src/Plugin/Field/FieldWidget/AutocompleteWidget.php b/core/modules/entity_reference/src/Plugin/Field/FieldWidget/AutocompleteWidget.php
index 3633b5d..ef9e6ea 100644
--- a/core/modules/entity_reference/src/Plugin/Field/FieldWidget/AutocompleteWidget.php
+++ b/core/modules/entity_reference/src/Plugin/Field/FieldWidget/AutocompleteWidget.php
@@ -73,7 +73,7 @@ public function elementValidate($element, FormStateInterface $form_state, $form)
       elseif (preg_match("/.+\(([\w.]+)\)/", $element['#value'], $matches)) {
         $value = $matches[1];
       }
-      if (!$value) {
+      if ($value === NULL) {
         // Try to get a match from the input string when the user didn't use the
         // autocomplete but filled in a value manually.
         $handler = \Drupal::service('plugin.manager.entity_reference.selection')->getSelectionHandler($this->fieldDefinition);
diff --git a/core/modules/entity_reference/src/Tests/EntityReferenceAdminTest.php b/core/modules/entity_reference/src/Tests/EntityReferenceAdminTest.php
index 9812800..095cdf9 100644
--- a/core/modules/entity_reference/src/Tests/EntityReferenceAdminTest.php
+++ b/core/modules/entity_reference/src/Tests/EntityReferenceAdminTest.php
@@ -113,6 +113,9 @@ public function testAvailableFormatters() {
     // Create entity reference field with taxonomy term as a target.
     $taxonomy_term_field_name = $this->createEntityReferenceField('taxonomy_term', 'tags');
 
+    // Create entity reference field with user as a target.
+    $user_field_name = $this->createEntityReferenceField('user');
+
     // Create entity reference field with node as a target.
     $node_field_name = $this->createEntityReferenceField('node', $this->type);
 
@@ -132,6 +135,17 @@ public function testAvailableFormatters() {
       'hidden',
     ));
 
+    // Test if User Reference Field has the correct formatters.
+    // Author should be available for this field.
+    // RSS Category should not be available for this field.
+    $this->assertFieldSelectOptions('fields[field_' . $user_field_name . '][type]', array(
+      'author',
+      'entity_reference_entity_id',
+      'entity_reference_entity_view',
+      'entity_reference_label',
+      'hidden',
+    ));
+
     // Test if Node Entity Reference Field has the correct formatters.
     // RSS Category should not be available for this field.
     $this->assertFieldSelectOptions('fields[field_' . $node_field_name . '][type]', array(
diff --git a/core/modules/entity_reference/src/Tests/EntityReferenceIntegrationTest.php b/core/modules/entity_reference/src/Tests/EntityReferenceIntegrationTest.php
index c16d1bc..f13cc5d 100644
--- a/core/modules/entity_reference/src/Tests/EntityReferenceIntegrationTest.php
+++ b/core/modules/entity_reference/src/Tests/EntityReferenceIntegrationTest.php
@@ -59,6 +59,7 @@ protected function setUp() {
    * Tests the entity reference field with all its supported field widgets.
    */
   public function testSupportedEntityTypesAndWidgets() {
+    $user_id = mt_rand(128, 256);
     foreach ($this->getTestEntities() as $referenced_entities) {
       $this->fieldName = 'field_test_' . $referenced_entities[0]->getEntityTypeId();
 
@@ -68,10 +69,15 @@ public function testSupportedEntityTypesAndWidgets() {
       // Test the default 'entity_reference_autocomplete' widget.
       entity_get_form_display($this->entityType, $this->bundle, 'default')->setComponent($this->fieldName)->save();
 
+      $user_id++;
+      entity_create('user', array(
+        'uid' => $user_id,
+        'name' => $this->randomString(),
+      ))->save();
       $entity_name = $this->randomMachineName();
       $edit = array(
         'name' => $entity_name,
-        'user_id' => mt_rand(0, 128),
+        'user_id' => $user_id,
         $this->fieldName . '[0][target_id]' => $referenced_entities[0]->label() . ' (' . $referenced_entities[0]->id() . ')',
         // Test an input of the entity label without a ' (entity_id)' suffix.
         $this->fieldName . '[1][target_id]' => $referenced_entities[1]->label(),
@@ -94,9 +100,14 @@ public function testSupportedEntityTypesAndWidgets() {
       $target_id = $referenced_entities[0]->label() . ' (' . $referenced_entities[0]->id() . ')';
       // Test an input of the entity label without a ' (entity_id)' suffix.
       $target_id .= ', ' . $referenced_entities[1]->label();
+      $user_id++;
+      entity_create('user', array(
+        'uid' => $user_id,
+        'name' => $this->randomString(),
+      ))->save();
       $edit = array(
         'name' => $entity_name,
-        'user_id' => mt_rand(0, 128),
+        'user_id' => $user_id,
         $this->fieldName . '[target_id]' => $target_id,
       );
       $this->drupalPostForm($this->entityType . '/add', $edit, t('Save'));
@@ -111,9 +122,11 @@ public function testSupportedEntityTypesAndWidgets() {
       // Test all the other widgets supported by the entity reference field.
       // Since we don't know the form structure for these widgets, just test
       // that editing and saving an already created entity works.
+      // Also exclude the special author reference widgets.
+      $exclude = array('entity_reference_autocomplete', 'entity_reference_autocomplete_tags', 'route_based_autocomplete', 'author_autocomplete');
       $entity = current(entity_load_multiple_by_properties($this->entityType, array('name' => $entity_name)));
       $supported_widgets = \Drupal::service('plugin.manager.field.widget')->getOptions('entity_reference');
-      $supported_widget_types = array_diff(array_keys($supported_widgets), array('entity_reference_autocomplete', 'entity_reference_autocomplete_tags'));
+      $supported_widget_types = array_diff(array_keys($supported_widgets), $exclude);
 
       foreach ($supported_widget_types as $widget_type) {
         entity_get_form_display($this->entityType, $this->bundle, 'default')->setComponent($this->fieldName, array(
diff --git a/core/modules/field/config/schema/field.schema.yml b/core/modules/field/config/schema/field.schema.yml
index d1dbd7b..0a08ba3 100644
--- a/core/modules/field/config/schema/field.schema.yml
+++ b/core/modules/field/config/schema/field.schema.yml
@@ -316,3 +316,15 @@ entity_form_display.field.checkbox:
         display_label:
           type: boolean
           label: 'Use field label instead of the "On value" as label'
+
+entity_form_display.field.timestamp:
+  type: entity_field_form_display_base
+  label: 'Timestamp default display format settings'
+  mapping:
+    settings:
+      type: mapping
+      label: 'Settings'
+      mapping:
+        use_request_time_on_empty:
+          type: boolean
+          label: 'Whether the current request time should be used if an empty value is submitted'
diff --git a/core/modules/forum/config/install/rdf.mapping.node.forum.yml b/core/modules/forum/config/install/rdf.mapping.node.forum.yml
index 7db68c7..be874cd 100644
--- a/core/modules/forum/config/install/rdf.mapping.node.forum.yml
+++ b/core/modules/forum/config/install/rdf.mapping.node.forum.yml
@@ -11,12 +11,12 @@ fieldMappings:
     properties:
       - 'schema:dateCreated'
     datatype_callback:
-      callable: 'date_iso8601'
+      callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
   changed:
     properties:
       - 'schema:dateModified'
     datatype_callback:
-      callable: 'date_iso8601'
+      callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
   body:
     properties:
       - 'schema:text'
diff --git a/core/modules/forum/src/Tests/ForumBlockTest.php b/core/modules/forum/src/Tests/ForumBlockTest.php
index 4b4942b..78e1c44 100644
--- a/core/modules/forum/src/Tests/ForumBlockTest.php
+++ b/core/modules/forum/src/Tests/ForumBlockTest.php
@@ -169,8 +169,8 @@ protected function createForumTopics($count = 5) {
         'body[0][value]' => $body,
         // Forum posts are ordered by timestamp, so force a unique timestamp by
         // adding the index.
-        'created[date]' => $date->format('Y-m-d'),
-        'created[time]' => $date->format('H:i:s'),
+        'created[0][value][date]' => $date->format('Y-m-d'),
+        'created[0][value][time]' => $date->format('H:i:s'),
       );
 
       // Create the forum topic, preselecting the forum ID via a URL parameter.
diff --git a/core/modules/node/node.info.yml b/core/modules/node/node.info.yml
index e61b363..ab8e3c3 100644
--- a/core/modules/node/node.info.yml
+++ b/core/modules/node/node.info.yml
@@ -7,3 +7,4 @@ core: 8.x
 configure: node.overview_types
 dependencies:
   - text
+  - entity_reference
diff --git a/core/modules/node/node.js b/core/modules/node/node.js
index 7e088ef..298bcb9 100644
--- a/core/modules/node/node.js
+++ b/core/modules/node/node.js
@@ -27,8 +27,8 @@
 
       $context.find('.node-form-author').drupalSetSummary(function (context) {
         var $context = $(context);
-        var name = $context.find('.form-item-name input').val() || drupalSettings.anonymous,
-          date = $context.find('.form-item-date input').val();
+        var name = $context.find('.field-name-uid input').val() || drupalSettings.anonymous,
+          date = $context.find('.field-name-created input').val();
         return date ?
           Drupal.t('By @name on @date', { '@name': name, '@date': date }) :
           Drupal.t('By @name', { '@name': name });
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index fefd6d5..eb794f3 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -182,6 +182,14 @@ function node_theme() {
       'base hook' => 'field',
       'template' => 'field--node--title',
     ),
+    'field__node__uid' => array(
+      'base hook' => 'field',
+      'template' => 'field--node--uid',
+    ),
+    'field__node__created' => array(
+      'base hook' => 'field',
+      'template' => 'field--node--created',
+    ),
   );
 }
 
@@ -203,15 +211,6 @@ function node_entity_view_display_alter(EntityViewDisplayInterface $display, $co
 }
 
 /**
- * Implements hook_entity_form_display_alter().
- */
-function node_entity_form_display_alter(EntityFormDisplayInterface $form_display, $context) {
-  if ($context['entity_type'] == 'node') {
-    $node_type = node_type_load($context['bundle']);
-  }
-}
-
-/**
  * Gathers a listing of links to nodes.
  *
  * @param $result
@@ -613,14 +612,10 @@ function template_preprocess_node(&$variables) {
   $variables['node'] = $variables['elements']['#node'];
   /** @var \Drupal\node\NodeInterface $node */
   $node = $variables['node'];
-
-  $variables['date'] = format_date($node->getCreatedTime());
-  $username = array(
-    '#theme' => 'username',
-    '#account' => $node->getOwner(),
-    '#link_options' => array('attributes' => array('rel' => 'author')),
-  );
-  $variables['author_name'] = drupal_render($username);
+  $variables['date'] = drupal_render($variables['elements']['created'], TRUE);
+  unset($variables['elements']['created']);
+  $variables['author_name'] = drupal_render($variables['elements']['uid'], TRUE);
+  unset($variables['elements']['uid']);
 
   $variables['url'] = $node->url('canonical', array(
     'language' => $node->language(),
diff --git a/core/modules/node/src/Entity/Node.php b/core/modules/node/src/Entity/Node.php
index da0eb0b..adbf3c1 100644
--- a/core/modules/node/src/Entity/Node.php
+++ b/core/modules/node/src/Entity/Node.php
@@ -372,10 +372,29 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
 
     $fields['uid'] = BaseFieldDefinition::create('entity_reference')
       ->setLabel(t('Author'))
-      ->setDescription(t('The user that is the node author.'))
+      ->setDescription(t('The user ID of the node author.'))
       ->setRevisionable(TRUE)
-      ->setSetting('target_type', 'user')
-      ->setTranslatable(TRUE);
+      ->setSettings(array(
+        'target_type' => 'user',
+        'handler' => 'default',
+      ))
+      ->setDefaultValueCallback(array('Drupal\node\Entity\Node', 'getCurrentUserId'))
+      ->setTranslatable(TRUE)
+      ->setDisplayOptions('view', array(
+        'label' => 'hidden',
+        'type' => 'author',
+        'weight' => 0,
+      ))
+      ->setDisplayOptions('form', array(
+        'type' => 'entity_reference_autocomplete',
+        'weight' => -1,
+        'settings' => array(
+          'match_operator' => 'CONTAINS',
+          'size' => '60',
+          'autocomplete_type' => 'tags',
+          'placeholder' => '',
+        ),
+      ));
 
     $fields['status'] = BaseFieldDefinition::create('boolean')
       ->setLabel(t('Publishing status'))
@@ -388,7 +407,20 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setLabel(t('Created'))
       ->setDescription(t('The time that the node was created.'))
       ->setRevisionable(TRUE)
-      ->setTranslatable(TRUE);
+      ->setTranslatable(TRUE)
+      ->setDisplayOptions('view', array(
+        'label' => 'hidden',
+        'type' => 'timestamp',
+        'weight' => 0,
+      ))
+      ->setDisplayOptions('form', array(
+        'type' => 'timestamp',
+        'weight' => 0,
+        'settings' => array(
+          'use_request_time_on_empty' => TRUE,
+        ),
+      ))
+      ->setDisplayConfigurable('form', TRUE);
 
     $fields['changed'] = BaseFieldDefinition::create('changed')
       ->setLabel(t('Changed'))
@@ -401,13 +433,27 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDescription(t('A boolean indicating whether the node should be displayed on the front page.'))
       ->setRevisionable(TRUE)
       ->setTranslatable(TRUE)
-      ->setDefaultValue(TRUE);
+      ->setDefaultValue(TRUE)
+      ->setDisplayOptions('form', array(
+        'type' => 'boolean_checkbox',
+        'settings' => array(
+          'display_label' => TRUE,
+        ),
+        'weight' => -1,
+      ));
 
     $fields['sticky'] = BaseFieldDefinition::create('boolean')
       ->setLabel(t('Sticky'))
       ->setDescription(t('A boolean indicating whether the node should be displayed at the top of lists in which it appears.'))
       ->setRevisionable(TRUE)
-      ->setTranslatable(TRUE);
+      ->setTranslatable(TRUE)
+      ->setDisplayOptions('form', array(
+        'type' => 'boolean_checkbox',
+        'settings' => array(
+          'display_label' => TRUE,
+        ),
+        'weight' => 0,
+      ));
 
     $fields['revision_timestamp'] = BaseFieldDefinition::create('created')
       ->setLabel(t('Revision timestamp'))
@@ -424,11 +470,30 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
 
     $fields['revision_log'] = BaseFieldDefinition::create('string_long')
       ->setLabel(t('Revision log message'))
-      ->setDescription(t('The log entry explaining the changes in this revision.'))
+      ->setDescription(t('Briefly describe the changes you have made.'))
       ->setRevisionable(TRUE)
-      ->setTranslatable(TRUE);
+      ->setTranslatable(TRUE)
+      ->setDisplayOptions('form', array(
+        'type' => 'text_textarea',
+        'weight' => 0,
+        'settings' => array(
+          'rows' => 4,
+        ),
+      ));
 
     return $fields;
   }
 
+  /**
+   * Default value callback for 'uid' base field definition.
+   *
+   * @see ::baseFieldDefinitions()
+   *
+   * @return array
+   *   An array of default values.
+   */
+  public static function getCurrentUserId() {
+    return array(\Drupal::currentUser()->id());
+  }
+
 }
diff --git a/core/modules/node/src/NodeForm.php b/core/modules/node/src/NodeForm.php
index a2ec826..032a8e8 100644
--- a/core/modules/node/src/NodeForm.php
+++ b/core/modules/node/src/NodeForm.php
@@ -7,12 +7,10 @@
 
 namespace Drupal\node;
 
-use Drupal\Component\Utility\NestedArray;
-use Drupal\Core\Datetime\DrupalDateTime;
 use Drupal\Core\Entity\ContentEntityForm;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Language\LanguageInterface;
-use Drupal\Component\Utility\String;
+use Drupal\user\Entity\User;
 
 /**
  * Form controller for the node edit forms.
@@ -37,7 +35,6 @@ protected function prepareEntity() {
     $this->settings = $type->getModuleSettings('node');
 
     if (!$node->isNew()) {
-      $node->date = format_date($node->getCreatedTime(), 'custom', 'Y-m-d H:i:s O');
       // Remove the revision log message from the original node entity.
       $node->revision_log = NULL;
     }
@@ -50,6 +47,16 @@ public function form(array $form, FormStateInterface $form_state) {
     /** @var \Drupal\node\NodeInterface $node */
     $node = $this->entity;
 
+    // Create the "advanced" vertical tabs before building the form, so that
+    // field widgets may detect its presence and choose to live there.
+    $form['advanced'] = array(
+      '#type' => 'vertical_tabs',
+      '#attributes' => array('class' => array('entity-meta')),
+      '#weight' => 99,
+    );
+
+    $form = parent::form($form, $form_state, $node);
+
     if ($this->operation == 'edit') {
       $form['#title'] = $this->t('<em>Edit @type</em> @title', array('@type' => node_get_type_label($node), '@title' => $node->label()));
     }
@@ -86,13 +93,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#access' => isset($language_configuration['language_show']) && $language_configuration['language_show'],
     );
 
-    $form['advanced'] = array(
-      '#type' => 'vertical_tabs',
-      '#attributes' => array('class' => array('entity-meta')),
-      '#weight' => 99,
-    );
-
-    // Add a revision log field if the "Create new revision" option is checked,
+    // Add a revision_log field if the "Create new revision" option is checked,
     // or if the current user has the ability to check that option.
     $form['revision_information'] = array(
       '#type' => 'details',
@@ -116,14 +117,12 @@ public function form(array $form, FormStateInterface $form_state) {
       '#default_value' => !empty($this->settings['options']['revision']),
       '#access' => $node->isNewRevision() || $current_user->hasPermission('administer nodes'),
       '#group' => 'revision_information',
+      // Ensure the 'Create new revision' checkbox sits above the revision log
+      // message.
+      '#weight' => -1,
     );
 
-    $form['revision_log'] = array(
-      '#type' => 'textarea',
-      '#title' => t('Revision log message'),
-      '#rows' => 4,
-      '#default_value' => !empty($node->revision_log->value) ? $node->revision_log->value : '',
-      '#description' => t('Briefly describe the changes you have made.'),
+    $form['revision_log'] += array(
       '#states' => array(
         'visible' => array(
           ':input[name="revision"]' => array('checked' => TRUE),
@@ -154,26 +153,17 @@ public function form(array $form, FormStateInterface $form_state) {
       '#optional' => TRUE,
     );
 
-    $form['uid'] = array(
-      '#type' => 'textfield',
-      '#title' => t('Authored by'),
-      '#maxlength' => 60,
-      '#autocomplete_route_name' => 'user.autocomplete',
-      '#default_value' => $node->getOwnerId()? $node->getOwner()->getUsername() : '',
-      '#weight' => -1,
-      '#description' => t('Leave blank for %anonymous.', array('%anonymous' => $user_config->get('anonymous'))),
+    $form['uid'] += array(
       '#group' => 'author',
       '#access' => $current_user->hasPermission('administer nodes'),
     );
-    $form['created'] = array(
-      '#type' => 'textfield',
-      '#title' => t('Authored on'),
-      '#maxlength' => 25,
-      '#description' => t('Format: %time. The date format is YYYY-MM-DD and %timezone is the time zone offset from UTC. Leave blank to use the time of form submission.', array('%time' => !empty($node->date) ? date_format(date_create($node->date), 'Y-m-d H:i:s O') : format_date($node->getCreatedTime(), 'custom', 'Y-m-d H:i:s O'), '%timezone' => !empty($node->date) ? date_format(date_create($node->date), 'O') : format_date($node->getCreatedTime(), 'custom', 'O'))),
-      '#default_value' => !empty($node->date) ? $node->date : '',
+    $form['uid']['widget'][0]['value']['#title'] = $this->t('Authored by');
+
+    $form['created'] += array(
       '#group' => 'author',
       '#access' => $current_user->hasPermission('administer nodes'),
     );
+    $form['created']['widget'][0]['value']['#title'] = $this->t('Authored on');
 
     // Node options for administrators.
     $form['options'] = array(
@@ -190,23 +180,17 @@ public function form(array $form, FormStateInterface $form_state) {
       '#optional' => TRUE,
     );
 
-    $form['promote'] = array(
-      '#type' => 'checkbox',
-      '#title' => t('Promoted to front page'),
-      '#default_value' => $node->isPromoted(),
+    $form['promote'] += array(
       '#group' => 'options',
       '#access' => $current_user->hasPermission('administer nodes'),
     );
 
-    $form['sticky'] = array(
-      '#type' => 'checkbox',
-      '#title' => t('Sticky at top of lists'),
-      '#default_value' => $node->isSticky(),
+    $form['sticky'] += array(
       '#group' => 'options',
       '#access' => $current_user->hasPermission('administer nodes'),
     );
 
-    return parent::form($form, $form_state, $node);
+    return $form;
   }
 
   /**
@@ -300,21 +284,6 @@ public function validate(array $form, FormStateInterface $form_state) {
       $form_state->setErrorByName('changed', $this->t('The content on this page has either been modified by another user, or you have already submitted modifications using this form. As a result, your changes cannot be saved.'));
     }
 
-    // Validate the "authored by" field.
-    if (!$form_state->isValueEmpty('uid') && !user_load_by_name($form_state->getValue('uid'))) {
-      // The use of empty() is mandatory in the context of usernames
-      // as the empty string denotes the anonymous user. In case we
-      // are dealing with an anonymous user we set the user ID to 0.
-      $form_state->setErrorByName('uid', $this->t('The username %name does not exist.', array('%name' => $form_state->getValue('uid'))));
-    }
-
-    // Validate the "authored on" field.
-    // The date element contains the date object.
-    $date = $node->date instanceof DrupalDateTime ? $node->date : new DrupalDateTime($node->date);
-    if ($date->hasErrors()) {
-      $form_state->setErrorByName('date', $this->t('You have to specify a valid date.'));
-    }
-
     // Invoke hook_node_validate() for validation needed by modules.
     // Can't use \Drupal::moduleHandler()->invokeAll(), because $form_state must
     // be receivable by reference.
@@ -409,15 +378,16 @@ public function buildEntity(array $form, FormStateInterface $form_state) {
     $entity = parent::buildEntity($form, $form_state);
     // A user might assign the node author by entering a user name in the node
     // form, which we then need to translate to a user ID.
-    if (!$form_state->isValueEmpty('uid') && $account = user_load_by_name($form_state->getValue('uid'))) {
+    // @todo: Remove it when https://www.drupal.org/node/2322525 is pushed.
+    if (!empty($form_state->getValue('uid')[0]['target_id']) && $account = User::load($form_state->getValue('uid')[0]['target_id'])) {
       $entity->setOwnerId($account->id());
     }
     else {
       $entity->setOwnerId(0);
     }
 
-    if (!$form_state->isValueEmpty('created') && $form_state->getValue('created') instanceOf DrupalDateTime) {
-      $entity->setCreatedTime($form_state->getValue('created')->getTimestamp());
+    if (!$form_state->isValueEmpty('created')) {
+      $entity->setCreatedTime($form_state->getValue('created')[0]['value']);
     }
     else {
       $entity->setCreatedTime(REQUEST_TIME);
diff --git a/core/modules/node/src/NodeTranslationHandler.php b/core/modules/node/src/NodeTranslationHandler.php
index cdcf11f..532e33f 100644
--- a/core/modules/node/src/NodeTranslationHandler.php
+++ b/core/modules/node/src/NodeTranslationHandler.php
@@ -76,13 +76,13 @@ protected function entityFormTitle(EntityInterface $entity) {
    */
   public function entityFormEntityBuild($entity_type, EntityInterface $entity, array $form, FormStateInterface $form_state) {
     if ($form_state->hasValue('content_translation')) {
-      $form_controller = content_translation_form_controller($form_state);
       $translation = &$form_state->getValue('content_translation');
-      $translation['status'] = $form_controller->getEntity()->isPublished();
+      $translation['status'] = $entity->isPublished();
       // $form['content_translation']['name'] is the equivalent field
       // for translation author uid.
-      $translation['name'] = $form_state->getValue('uid');
-      $translation['created'] = $form_state->getValue('created');
+      $account = $entity->uid->entity;
+      $translation['name'] = $account ? $account->getUsername() : '';
+      $translation['created'] = format_date($entity->created->value, 'custom', 'Y-m-d H:i:s O');
     }
     parent::entityFormEntityBuild($entity_type, $entity, $form, $form_state);
   }
diff --git a/core/modules/node/src/NodeViewBuilder.php b/core/modules/node/src/NodeViewBuilder.php
index 606ef36..5521812 100644
--- a/core/modules/node/src/NodeViewBuilder.php
+++ b/core/modules/node/src/NodeViewBuilder.php
@@ -75,12 +75,6 @@ protected function getBuildDefaults(EntityInterface $entity, $view_mode, $langco
     if (isset($defaults['#cache']) && isset($entity->in_preview)) {
       unset($defaults['#cache']);
     }
-    else {
-      // The node 'submitted' info is not rendered in a standard way (renderable
-      // array) so we have to add a cache tag manually.
-      // @todo Delete this once https://drupal.org/node/2226493 lands.
-      $defaults['#cache']['tags']['user'][] = $entity->getOwnerId();
-    }
 
     return $defaults;
   }
diff --git a/core/modules/node/src/Tests/MultiStepNodeFormBasicOptionsTest.php b/core/modules/node/src/Tests/MultiStepNodeFormBasicOptionsTest.php
index 33375fa..bbba4e9 100644
--- a/core/modules/node/src/Tests/MultiStepNodeFormBasicOptionsTest.php
+++ b/core/modules/node/src/Tests/MultiStepNodeFormBasicOptionsTest.php
@@ -56,13 +56,13 @@ function testMultiStepNodeFormBasicOptions() {
 
     $edit = array(
       'title[0][value]' => 'a',
-      'promote' => FALSE,
-      'sticky' => 1,
+      'promote[value]' => FALSE,
+      'sticky[value]' => 1,
       "{$this->field_name}[0][value]" => $this->randomString(32),
     );
     $this->drupalPostForm('node/add/page', $edit, t('Add another item'));
-    $this->assertNoFieldChecked('edit-promote', 'promote stayed unchecked');
-    $this->assertFieldChecked('edit-sticky', 'sticky stayed checked');
+    $this->assertNoFieldChecked('edit-promote-value', 'Promote stayed unchecked');
+    $this->assertFieldChecked('edit-sticky-value', 'Sticky stayed checked');
   }
 
 }
diff --git a/core/modules/node/src/Tests/NodeCreationTest.php b/core/modules/node/src/Tests/NodeCreationTest.php
index 53b32b2..a6d22fd 100644
--- a/core/modules/node/src/Tests/NodeCreationTest.php
+++ b/core/modules/node/src/Tests/NodeCreationTest.php
@@ -57,9 +57,9 @@ function testNodeCreation() {
     $this->assertTrue($node, 'Node found in database.');
 
     // Verify that pages do not show submitted information by default.
-    $submitted_by = t('Submitted by !username on !datetime', array('!username' => $this->loggedInUser->getUsername(), '!datetime' => format_date($node->getCreatedTime())));
     $this->drupalGet('node/' . $node->id());
-    $this->assertNoText($submitted_by);
+    $this->assertNoText($node->getOwner()->getUsername());
+    $this->assertNoText(format_date($node->getCreatedTime()));
 
     // Change the node type setting to show submitted by information.
     $node_type = entity_load('node_type', 'page');
@@ -67,7 +67,8 @@ function testNodeCreation() {
     $node_type->save();
 
     $this->drupalGet('node/' . $node->id());
-    $this->assertText($submitted_by);
+    $this->assertText($node->getOwner()->getUsername());
+    $this->assertText(format_date($node->getCreatedTime()));
   }
 
   /**
@@ -149,7 +150,7 @@ public function testAuthorAutocomplete() {
 
     $this->drupalGet('node/add/page');
 
-    $result = $this->xpath('//input[@id="edit-uid" and contains(@data-autocomplete-path, "user/autocomplete")]');
+    $result = $this->xpath('//input[@id="edit-uid-0-value" and contains(@data-autocomplete-path, "user/autocomplete")]');
     $this->assertEqual(count($result), 0, 'No autocompletion without access user profiles.');
 
     $admin_user = $this->drupalCreateUser(array('administer nodes', 'create page content', 'access user profiles'));
@@ -157,7 +158,7 @@ public function testAuthorAutocomplete() {
 
     $this->drupalGet('node/add/page');
 
-    $result = $this->xpath('//input[@id="edit-uid" and contains(@data-autocomplete-path, "user/autocomplete")]');
+    $result = $this->xpath('//input[@id="edit-uid-0-target-id" and contains(@data-autocomplete-path, "/entity_reference/autocomplete/tags/uid/node/page")]');
     $this->assertEqual(count($result), 1, 'Ensure that the user does have access to the autocompletion');
   }
 
diff --git a/core/modules/node/src/Tests/NodeTranslationUITest.php b/core/modules/node/src/Tests/NodeTranslationUITest.php
index a43a642..4fdac33 100644
--- a/core/modules/node/src/Tests/NodeTranslationUITest.php
+++ b/core/modules/node/src/Tests/NodeTranslationUITest.php
@@ -152,11 +152,11 @@ protected function doTestAuthoringInfo() {
         'promote' => (bool) mt_rand(0, 1),
       );
       $edit = array(
-        'uid' => $user->getUsername(),
-        'created[date]' => format_date($values[$langcode]['created'], 'custom', 'Y-m-d'),
-        'created[time]' => format_date($values[$langcode]['created'], 'custom', 'H:i:s'),
-        'sticky' => $values[$langcode]['sticky'],
-        'promote' => $values[$langcode]['promote'],
+        'uid[0][target_id]' => $user->getUsername(),
+        'created[0][value][date]' => format_date($values[$langcode]['created'], 'custom', 'Y-m-d'),
+        'created[0][value][time]' => format_date($values[$langcode]['created'], 'custom', 'H:i:s'),
+        'sticky[value]' => $values[$langcode]['sticky'],
+        'promote[value]' => $values[$langcode]['promote'],
       );
       $this->drupalPostForm($path, $edit, $this->getFormSubmitAction($entity, $langcode), array('language' => $languages[$langcode]));
     }
diff --git a/core/modules/node/src/Tests/PageEditTest.php b/core/modules/node/src/Tests/PageEditTest.php
index 5d1bc5f..259ebbd 100644
--- a/core/modules/node/src/Tests/PageEditTest.php
+++ b/core/modules/node/src/Tests/PageEditTest.php
@@ -108,21 +108,21 @@ function testPageAuthoredBy() {
 
     // Try to change the 'authored by' field to an invalid user name.
     $edit = array(
-      'uid' => 'invalid-name',
+      'uid[0][target_id]' => 'invalid-name',
     );
     $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
-    $this->assertText('The username invalid-name does not exist.');
+    $this->assertRaw(t('There are no entities matching "%name".', array('%name' => 'invalid-name')));
 
     // Change the authored by field to an empty string, which should assign
     // authorship to the anonymous user (uid 0).
-    $edit['uid'] = '';
+    $edit['uid[0][target_id]'] = 'Anonymous (0)';
     $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
     $node = node_load($node->id(), TRUE);
     $this->assertIdentical($node->getOwnerId(), '0', 'Node authored by anonymous user.');
 
     // Change the authored by field to another user's name (that is not
     // logged in).
-    $edit['uid'] = $this->web_user->getUsername();
+    $edit['uid[0][target_id]'] = $this->web_user->getUsername();
     $this->drupalPostForm('node/' . $node->id() . '/edit', $edit, t('Save and keep published'));
     $node = node_load($node->id(), TRUE);
     $this->assertIdentical($node->getOwnerId(), $this->web_user->id(), 'Node authored by normal user.');
@@ -130,6 +130,6 @@ function testPageAuthoredBy() {
     // Check that normal users cannot change the authored by information.
     $this->drupalLogin($this->web_user);
     $this->drupalGet('node/' . $node->id() . '/edit');
-    $this->assertNoFieldByName('uid');
+    $this->assertNoFieldByName('uid[0][target_id]');
   }
 }
diff --git a/core/modules/node/src/Tests/PagePreviewTest.php b/core/modules/node/src/Tests/PagePreviewTest.php
index e387c64..bb605f3 100644
--- a/core/modules/node/src/Tests/PagePreviewTest.php
+++ b/core/modules/node/src/Tests/PagePreviewTest.php
@@ -175,6 +175,10 @@ function testPagePreview() {
    * Checks the node preview functionality, when using revisions.
    */
   function testPagePreviewWithRevisions() {
+    // Revision Log field is accessible to administrators only.
+    $admin_user = $this->drupalCreateUser(array('administer nodes', 'edit own page content', 'create page content'));
+    $this->drupalLogin($admin_user);
+
     $title_key = 'title[0][value]';
     $body_key = 'body[0][value]';
     $term_key = $this->field_name;
@@ -186,7 +190,8 @@ function testPagePreviewWithRevisions() {
     $edit[$title_key] = $this->randomMachineName(8);
     $edit[$body_key] = $this->randomMachineName(16);
     $edit[$term_key] = $this->term->id();
-    $edit['revision_log'] = $this->randomMachineName(32);
+    $edit['revision'] = TRUE;
+    $edit['revision_log[0][value]'] = $this->randomString(32);
     $this->drupalPostForm('node/add/page', $edit, t('Preview'));
 
     // Check that the preview is displaying the title, body and term.
@@ -201,7 +206,7 @@ function testPagePreviewWithRevisions() {
     $this->assertFieldByName($term_key, $edit[$term_key], 'Term field displayed.');
 
     // Check that the revision log field has the correct value.
-    $this->assertFieldByName('revision_log', $edit['revision_log'], 'Revision log field displayed.');
+    $this->assertFieldByName('revision_log[0][value]', $edit['revision_log[0][value]'], 'Revision log field displayed.');
   }
 
 }
diff --git a/core/modules/node/templates/field--node--created.html.twig b/core/modules/node/templates/field--node--created.html.twig
new file mode 100644
index 0000000..6c8a687
--- /dev/null
+++ b/core/modules/node/templates/field--node--created.html.twig
@@ -0,0 +1,18 @@
+{#
+/**
+* @file
+* Default theme implementation for the node created field.
+*
+* This is an override of field.html.twig for the node created field. See that
+* template for documentation about its details and overrides.
+*
+* Available variables:
+* - attributes: HTML attributes for the containing span element.
+* - items: List of all the field items.
+*
+* @see field.html.twig
+*
+* @ingroup themeable
+*/
+#}
+<span {{ attributes }}>{{ items }}</span>
diff --git a/core/modules/node/templates/field--node--uid.html.twig b/core/modules/node/templates/field--node--uid.html.twig
new file mode 100644
index 0000000..1fb0a6d
--- /dev/null
+++ b/core/modules/node/templates/field--node--uid.html.twig
@@ -0,0 +1,18 @@
+{#
+/**
+* @file
+* Default theme implementation for the node user field.
+*
+* This is an override of field.html.twig for the node user field. See that
+* template for documentation about its details and overrides.
+*
+* Available variables:
+* - attributes: HTML attributes for the containing span element.
+* - items: List of all the field items.
+*
+* @see field.html.twig
+*
+* @ingroup themeable
+*/
+#}
+<span {{ attributes }}>{{ items }}</span>
diff --git a/core/modules/node/templates/node.html.twig b/core/modules/node/templates/node.html.twig
index c80eecb..a0e629e 100644
--- a/core/modules/node/templates/node.html.twig
+++ b/core/modules/node/templates/node.html.twig
@@ -23,10 +23,8 @@
  * - author_picture: The node author user entity, rendered using the "compact"
  *   view mode.
  * - metadata: Metadata for this node.
- * - date: Formatted creation date. Preprocess functions can reformat it by
- *   calling format_date() with the desired parameters on
- *   $variables['created'].
- * - author_name: Themed username of node author output from theme_username().
+ * - date: Themed creation date field.
+ * - author_name: Themed author name field.
  * - url: Direct URL of the current node.
  * - display_submitted: Whether submission information should be displayed.
  * - attributes: HTML attributes for the containing element.
diff --git a/core/modules/rdf/rdf.module b/core/modules/rdf/rdf.module
index 0ee6614..95797f9 100644
--- a/core/modules/rdf/rdf.module
+++ b/core/modules/rdf/rdf.module
@@ -217,7 +217,7 @@ function rdf_entity_prepare_view($entity_type, array $entities, array $displays)
       $field_mapping = $mapping->getPreparedFieldMapping($name);
       if ($field_mapping) {
         foreach ($entity->get($name) as $item) {
-          $item->_attributes += rdf_rdfa_attributes($field_mapping, $item->getValue());
+          $item->_attributes += rdf_rdfa_attributes($field_mapping, $item->toArray());
         }
       }
     }
@@ -234,7 +234,7 @@ function rdf_comment_storage_load($comments) {
     // to optimize performance for websites that implement an entity cache.
     $created_mapping = rdf_get_mapping('comment', $comment->bundle())
       ->getPreparedFieldMapping('created');
-    $comment->rdf_data['date'] = rdf_rdfa_attributes($created_mapping, $comment->getCreatedTime());
+    $comment->rdf_data['date'] = rdf_rdfa_attributes($created_mapping, $comment->get('created')->first()->toArray());
     $entity = $comment->getCommentedEntity();
     $comment->rdf_data['entity_uri'] = $entity->url();
     if ($comment->hasParentComment()) {
@@ -305,7 +305,7 @@ function rdf_preprocess_node(&$variables) {
   // Adds RDFa markup for the date.
   $created_mapping = $mapping->getPreparedFieldMapping('created');
   if (!empty($created_mapping) && $variables['display_submitted']) {
-    $date_attributes = rdf_rdfa_attributes($created_mapping, $variables['node']->getCreatedTime());
+    $date_attributes = rdf_rdfa_attributes($created_mapping, $variables['node']->get('created')->first()->getValue());
     $rdf_metadata = array(
       '#theme' => 'rdf_metadata',
       '#metadata' => array($date_attributes),
diff --git a/core/modules/rdf/src/CommonDataConverter.php b/core/modules/rdf/src/CommonDataConverter.php
index e27f48b..af95d37 100644
--- a/core/modules/rdf/src/CommonDataConverter.php
+++ b/core/modules/rdf/src/CommonDataConverter.php
@@ -20,7 +20,21 @@ class CommonDataConverter {
    * @return mixed
    *   Returns the data.
    */
-  static function rawValue($data) {
+  public static function rawValue($data) {
     return $data;
   }
+
+  /**
+   * Converts a date entity field array into an ISO 8601 timestamp string.
+   *
+   * @param array $data
+   *   The array containing the 'value' element.
+   *
+   * @return string
+   *   Returns the ISO 8601 timestamp.
+   */
+  public static function dateIso8601Value($data) {
+    return date_iso8601($data['value']);
+  }
+
 }
diff --git a/core/modules/rdf/src/Tests/CommentAttributesTest.php b/core/modules/rdf/src/Tests/CommentAttributesTest.php
index 601a239..82fd967 100644
--- a/core/modules/rdf/src/Tests/CommentAttributesTest.php
+++ b/core/modules/rdf/src/Tests/CommentAttributesTest.php
@@ -72,12 +72,12 @@ protected function setUp() {
       'created' => array(
         'properties' => array('dc:date', 'dc:created'),
         'datatype' => 'xsd:dateTime',
-        'datatype_callback' => array('callable' => 'date_iso8601'),
+        'datatype_callback' => array('callable' => 'Drupal\rdf\CommonDataConverter::dateIso8601Value'),
       ),
       'changed' => array(
         'properties' => array('dc:modified'),
         'datatype' => 'xsd:dateTime',
-        'datatype_callback' => array('callable' => 'date_iso8601'),
+        'datatype_callback' => array('callable' => 'Drupal\rdf\CommonDataConverter::dateIso8601Value'),
       ),
       'comment_body' => array(
         'properties' => array('content:encoded'),
diff --git a/core/modules/rdf/src/Tests/CrudTest.php b/core/modules/rdf/src/Tests/CrudTest.php
index 5460c53..49c14b7 100644
--- a/core/modules/rdf/src/Tests/CrudTest.php
+++ b/core/modules/rdf/src/Tests/CrudTest.php
@@ -90,7 +90,7 @@ function testFieldMapping() {
     $mapping = array(
       'properties' => array('dc:created'),
       'datatype' => 'xsd:dateTime',
-      'datatype_callback' => array('callable' => 'date_iso8601'),
+      'datatype_callback' => array('callable' => 'Drupal\rdf\CommonDataConverter::dateIso8601Value'),
     );
     rdf_get_mapping($this->entity_type, $this->bundle)
       ->setFieldMapping($field_name, $mapping)
@@ -103,7 +103,7 @@ function testFieldMapping() {
     $mapping = array(
       'properties' => array('dc:date'),
       'datatype' => 'foo:bar',
-      'datatype_callback' => array('callable' => 'date_iso8601'),
+      'datatype_callback' => array('callable' => 'Drupal\rdf\CommonDataConverter::dateIso8601Value'),
     );
     rdf_get_mapping($this->entity_type, $this->bundle)
       ->setFieldMapping($field_name, $mapping)
diff --git a/core/modules/rdf/src/Tests/NodeAttributesTest.php b/core/modules/rdf/src/Tests/NodeAttributesTest.php
index e855cc6..8539b2b 100644
--- a/core/modules/rdf/src/Tests/NodeAttributesTest.php
+++ b/core/modules/rdf/src/Tests/NodeAttributesTest.php
@@ -36,7 +36,7 @@ protected function setUp() {
       ->setFieldMapping('created', array(
         'properties' => array('dc:date', 'dc:created'),
         'datatype' => 'xsd:dateTime',
-        'datatype_callback' => array('callable' => 'date_iso8601'),
+        'datatype_callback' => array('callable' => 'Drupal\rdf\CommonDataConverter::dateIso8601Value'),
       ))
       ->save();
   }
diff --git a/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php b/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
index 844726a..36fd9d6 100644
--- a/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityTranslationFormTest.php
@@ -11,6 +11,7 @@
 use Drupal\field\Entity\FieldStorageConfig;
 use Drupal\simpletest\WebTestBase;
 use Drupal\Core\Language\Language;
+use Drupal\node\Entity\Node;
 
 /**
  * Tests entity translation form.
@@ -55,27 +56,31 @@ function testEntityFormLanguage() {
     $this->drupalLogin($web_user);
 
     // Create a node with language LanguageInterface::LANGCODE_NOT_SPECIFIED.
-    $edit = array();
+    $node = Node::create(array(
+      'type' => 'page',
+      'title' => $this->randomString(8),
+      'body' => array(
+        'value' => $this->randomString(16),
+      ),
+      'uid' => $web_user->id(),
+    ));
+    $node->save();
     $edit['title[0][value]'] = $this->randomMachineName(8);
     $edit['body[0][value]'] = $this->randomMachineName(16);
 
-    $this->drupalGet('node/add/page');
-    $form_langcode = \Drupal::state()->get('entity_test.form_langcode') ?: FALSE;
-    $this->drupalPostForm(NULL, $edit, t('Save'));
-
-    $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
+    $form_langcode = \Drupal::state()->get('entity_test.form_langcode') ?: 'und';
     $this->assertTrue($node->language()->id == $form_langcode, 'Form language is the same as the entity language.');
 
     // Edit the node and test the form language.
     $this->drupalGet($this->langcodes[0] . '/node/' . $node->id() . '/edit');
-    $form_langcode = \Drupal::state()->get('entity_test.form_langcode') ?: FALSE;
+    $form_langcode = \Drupal::state()->get('entity_test.form_langcode') ?: 'und';
     $this->assertTrue($node->language()->id == $form_langcode, 'Form language is the same as the entity language.');
 
     // Explicitly set form langcode.
     $langcode = $this->langcodes[0];
     $form_state['langcode'] = $langcode;
     \Drupal::service('entity.form_builder')->getForm($node, 'default', $form_state);
-    $form_langcode = \Drupal::state()->get('entity_test.form_langcode') ?: FALSE;
+    $form_langcode = \Drupal::state()->get('entity_test.form_langcode') ?: 'und';
     $this->assertTrue($langcode == $form_langcode, 'Form language is the same as the language parameter.');
 
     // Enable language selector.
@@ -109,7 +114,7 @@ function testEntityFormLanguage() {
     $node->getTranslation($langcode2)->body->value = $this->randomMachineName(16);
     $node->save();
     $this->drupalGet($langcode2 . '/node/' . $node->id() . '/edit');
-    $form_langcode = \Drupal::state()->get('entity_test.form_langcode') ?: FALSE;
+    $form_langcode = \Drupal::state()->get('entity_test.form_langcode') ?: 'und';
     $this->assertTrue($langcode2 == $form_langcode, "Node edit form language is $langcode2.");
   }
 }
diff --git a/core/modules/taxonomy/src/Tests/LegacyTest.php b/core/modules/taxonomy/src/Tests/LegacyTest.php
index 8a2ac68..0d8bea9 100644
--- a/core/modules/taxonomy/src/Tests/LegacyTest.php
+++ b/core/modules/taxonomy/src/Tests/LegacyTest.php
@@ -74,8 +74,8 @@ function testTaxonomyLegacyNode() {
     $date = new DrupalDateTime('1969-01-01 00:00:00');
     $edit = array();
     $edit['title[0][value]'] = $this->randomMachineName();
-    $edit['created[date]'] = $date->format('Y-m-d');
-    $edit['created[time]'] = $date->format('H:i:s');
+    $edit['created[0][value][date]'] = $date->format('Y-m-d');
+    $edit['created[0][value][time]'] = $date->format('H:i:s');
     $edit['body[0][value]'] = $this->randomMachineName();
     $edit['field_tags'] = $this->randomMachineName();
     $this->drupalPostForm('node/add/article', $edit, t('Save and publish'));
diff --git a/core/modules/text/src/Plugin/Field/FieldWidget/TextareaWidget.php b/core/modules/text/src/Plugin/Field/FieldWidget/TextareaWidget.php
index ef6a5db..5d4c788 100644
--- a/core/modules/text/src/Plugin/Field/FieldWidget/TextareaWidget.php
+++ b/core/modules/text/src/Plugin/Field/FieldWidget/TextareaWidget.php
@@ -19,7 +19,8 @@
  *   id = "text_textarea",
  *   label = @Translation("Text area (multiple rows)"),
  *   field_types = {
- *     "text_long"
+ *     "text_long",
+ *     "string_long",
  *   }
  * )
  */
diff --git a/core/modules/user/src/Plugin/Field/FieldFormatter/AuthorFormatter.php b/core/modules/user/src/Plugin/Field/FieldFormatter/AuthorFormatter.php
new file mode 100644
index 0000000..e30a0bf
--- /dev/null
+++ b/core/modules/user/src/Plugin/Field/FieldFormatter/AuthorFormatter.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\user\Plugin\Field\FieldFormatter\AuthorFormatter.
+ */
+
+namespace Drupal\user\Plugin\Field\FieldFormatter;
+
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\FormatterBase;
+
+/**
+ * Plugin implementation of the 'author' formatter.
+ *
+ * @FieldFormatter(
+ *   id = "author",
+ *   label = @Translation("Author"),
+ *   description = @Translation("Display the referenced author user entity."),
+ *   field_types = {
+ *     "entity_reference"
+ *   }
+ * )
+ */
+class AuthorFormatter extends FormatterBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function viewElements(FieldItemListInterface $items) {
+    $elements = array();
+
+    foreach ($items as $delta => $item) {
+      /** @var $referenced_user \Drupal\user\UserInterface */
+      if ($referenced_user = $item->entity) {
+        $elements[$delta] = array(
+          '#theme' => 'username',
+          '#account' => $referenced_user,
+          '#link_options' => array('attributes' => array('rel' => 'author')),
+          '#cache' => array(
+            'tags' => $referenced_user->getCacheTag(),
+          ),
+        );
+      }
+    }
+
+    return $elements;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function isApplicable(FieldDefinitionInterface $field_definition) {
+    return $field_definition->getFieldStorageDefinition()->getSetting('target_type') == 'user';
+  }
+
+}
diff --git a/core/profiles/standard/config/install/rdf.mapping.comment.node__comment.yml b/core/profiles/standard/config/install/rdf.mapping.comment.node__comment.yml
index 00abf0c..d8aa944 100644
--- a/core/profiles/standard/config/install/rdf.mapping.comment.node__comment.yml
+++ b/core/profiles/standard/config/install/rdf.mapping.comment.node__comment.yml
@@ -11,12 +11,12 @@ fieldMappings:
     properties:
       - 'schema:dateCreated'
     datatype_callback:
-      callable: 'date_iso8601'
+      callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
   changed:
     properties:
       - 'schema:dateModified'
     datatype_callback:
-      callable: 'date_iso8601'
+      callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
   comment_body:
     properties:
       - 'schema:text'
diff --git a/core/profiles/standard/config/install/rdf.mapping.node.article.yml b/core/profiles/standard/config/install/rdf.mapping.node.article.yml
index 10147e7..d1b7f80 100644
--- a/core/profiles/standard/config/install/rdf.mapping.node.article.yml
+++ b/core/profiles/standard/config/install/rdf.mapping.node.article.yml
@@ -11,12 +11,12 @@ fieldMappings:
     properties:
       - 'schema:dateCreated'
     datatype_callback:
-      callable: 'date_iso8601'
+      callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
   changed:
     properties:
       - 'schema:dateModified'
     datatype_callback:
-      callable: 'date_iso8601'
+      callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
   body:
     properties:
       - 'schema:text'
diff --git a/core/profiles/standard/config/install/rdf.mapping.node.page.yml b/core/profiles/standard/config/install/rdf.mapping.node.page.yml
index 8a5d377..38120ff 100644
--- a/core/profiles/standard/config/install/rdf.mapping.node.page.yml
+++ b/core/profiles/standard/config/install/rdf.mapping.node.page.yml
@@ -11,12 +11,12 @@ fieldMappings:
     properties:
       - 'schema:dateCreated'
     datatype_callback:
-      callable: 'date_iso8601'
+      callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
   changed:
     properties:
       - 'schema:dateModified'
     datatype_callback:
-      callable: 'date_iso8601'
+      callable: 'Drupal\rdf\CommonDataConverter::dateIso8601Value'
   body:
     properties:
       - 'schema:text'
diff --git a/core/themes/bartik/templates/node.html.twig b/core/themes/bartik/templates/node.html.twig
index d45b0f0..745b953 100644
--- a/core/themes/bartik/templates/node.html.twig
+++ b/core/themes/bartik/templates/node.html.twig
@@ -23,10 +23,8 @@
  * - author_picture: The node author user entity, rendered using the "compact"
  *   view mode.
  * - metadata: Metadata for this node.
- * - date: Formatted creation date. Preprocess functions can reformat it by
- *   calling format_date() with the desired parameters on
- *   $variables['created'].
- * - author_name: Themed username of node author output from theme_username().
+ * - date: Themed creation date field.
+ * - author_name: Themed author name field.
  * - url: Direct URL of the current node.
  * - display_submitted: Whether submission information should be displayed.
  * - attributes: HTML attributes for the containing element.
@@ -86,7 +84,7 @@
       <div class="node__meta">
         {{ author_picture }}
         <span{{ author_attributes }}>
-          {% trans %}Submitted by {{ author_name|passthrough }} on {{ date }}{% endtrans %}
+          {% trans %}Submitted by {{ author_name|passthrough }} on {{ date|passthrough }}{% endtrans %}
         </span>
         {{ metadata }}
       </div>