diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php
index a331fe6..4454049 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/AuthorAutocompleteWidget.php
@@ -46,7 +46,7 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
   /**
    * Validates an element.
    *
-   * @todo Convert to massageFormValues() override once that actually works.
+   * @todo Convert to massageFormValues() after https://drupal.org/node/2226723 lands.
    */
   public function elementValidate($element, &$form_state, $form) {
     $value = $element['#value'];
@@ -57,10 +57,13 @@ public function elementValidate($element, &$form_state, $form) {
       $value = 0;
     }
     else {
-      $account = user_load_by_name($element['#value']);
+      $account = user_load_by_name($value);
       if ($account !== FALSE) {
         $value = $account->id();
       }
+      else {
+        $value = -1;
+      }
     }
     form_set_value($element, $value, $form_state);
   }
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php
index 9856ca3..1d27fe7 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/TimestampWidget.php
@@ -20,7 +20,10 @@
  *   field_types = {
  *     "timestamp",
  *     "created",
- *   }
+ *   },
+ *   settings = {
+ *     "use_request_time_on_empty" = FALSE,
+ *   },
  * )
  */
 class TimestampWidget extends WidgetBase {
@@ -50,18 +53,17 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
   /**
    * Validates an element.
    *
-   * @todo Convert to massageFormValues() override once that actually works.
+   * @todo Convert to massageFormValues() after https://drupal.org/node/2226723 lands.
    */
   public function elementValidate($element, &$form_state, $form) {
     $value = trim($element['#value']);
     if (empty($value)) {
-      $value = 0;
+      $value = $this->getSetting('use_request_time_on_empty') ? REQUEST_TIME : 0;
     }
     else {
       $date = new DrupalDateTime($value);
       if ($date->hasErrors()) {
-        $value = -1;
-        // $this->setFormError('')
+        $value = FALSE;
       }
       else {
         $value = $date->getTimestamp();
diff --git a/core/modules/datetime/lib/Drupal/datetime/Plugin/Field/FieldWidget/DateTimeTimestampWidget.php b/core/modules/datetime/lib/Drupal/datetime/Plugin/Field/FieldWidget/DateTimeTimestampWidget.php
index a9310ef..395dd81 100644
--- a/core/modules/datetime/lib/Drupal/datetime/Plugin/Field/FieldWidget/DateTimeTimestampWidget.php
+++ b/core/modules/datetime/lib/Drupal/datetime/Plugin/Field/FieldWidget/DateTimeTimestampWidget.php
@@ -47,7 +47,7 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
   /**
    * Validates an element.
    *
-   * @todo Convert to massageFormValues() override once that actually works.
+   * @todo Convert to massageFormValues() after https://drupal.org/node/2226723 lands.
    */
   public function elementValidate($element, &$form_state, $form) {
     $date = $element['#value']['object'];
diff --git a/core/modules/node/lib/Drupal/node/Entity/Node.php b/core/modules/node/lib/Drupal/node/Entity/Node.php
index 9ed416b..78e1dd9 100644
--- a/core/modules/node/lib/Drupal/node/Entity/Node.php
+++ b/core/modules/node/lib/Drupal/node/Entity/Node.php
@@ -356,13 +356,7 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['langcode'] = FieldDefinition::create('language')
       ->setLabel(t('Language'))
       ->setDescription(t('The node language code.'))
-      ->setRevisionable(TRUE)
-      ->setCardinality(1)
-      ->setDisplayOptions('form', array(
-        'type' => 'language',
-        'weight' => 0,
-      ))
-      ->setDisplayConfigurable('form', TRUE);
+      ->setRevisionable(TRUE);
 
     $fields['title'] = FieldDefinition::create('string')
       ->setLabel(t('Title'))
@@ -390,7 +384,6 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDescription(t('The user ID of the node author.'))
       ->setRevisionable(TRUE)
       ->setTranslatable(TRUE)
-      ->setCardinality(1)
       ->setSettings(array(
         'target_type' => 'user',
         'default_value' => 0,
@@ -412,15 +405,13 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setLabel(t('Publishing status'))
       ->setDescription(t('A boolean indicating whether the node is published.'))
       ->setRevisionable(TRUE)
-      ->setTranslatable(TRUE)
-      ->setCardinality(1);
+      ->setTranslatable(TRUE);
 
     $fields['created'] = FieldDefinition::create('created')
       ->setLabel(t('Publication date'))
       ->setDescription(t('The time that the node was created.'))
       ->setRevisionable(TRUE)
       ->setTranslatable(TRUE)
-      ->setCardinality(1)
       ->setDisplayOptions('view', array(
         'label' => 'hidden',
         'type' => 'timestamp',
@@ -429,6 +420,9 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDisplayOptions('form', array(
         'type' => 'timestamp',
         'weight' => 0,
+        'settings' => array(
+          'use_request_time_on_empty' => TRUE,
+        ),
       ))
       ->setDisplayConfigurable('form', TRUE);
 
@@ -452,7 +446,6 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setLabel(t('Sticky at top of lists'))
       ->setRevisionable(TRUE)
       ->setTranslatable(TRUE)
-      ->setCardinality(1)
       ->setDisplayOptions('form', array(
         'type' => 'boolean',
         'weight' => 0,
@@ -472,9 +465,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setQueryable(FALSE)
       ->setRevisionable(TRUE);
 
-    $fields['log'] = FieldDefinition::create('string')
+    $fields['log'] = FieldDefinition::create('string_long')
       ->setLabel(t('Revision log message'))
-      ->setCardinality(1)
       ->setDescription(t('Briefly describe the changes you have made.'))
       ->setRevisionable(TRUE)
       ->setTranslatable(TRUE)
@@ -504,15 +496,14 @@ public static function bundleFieldDefinitions(EntityTypeInterface $entity_type,
     // Set a widget for the 'langcode' base field if Language module is enabled
     // and the bundle has multilingual support.
     if (\Drupal::moduleHandler()->moduleExists('language')) {
-      foreach (node_type_get_types() as $bundle) {
-        $configuration = language_get_default_configuration('node', $bundle->type);
-        if ($configuration['language_show']) {
-          $fields['langcode'] = clone $base_field_definitions['langcode'];
-          $fields['langcode']->setDisplayOptions('form', array(
-            'type' => 'language',
-            'weight' => 0,
-          ));
-        }
+      $configuration = language_get_default_configuration('node', $bundle);
+      if ($configuration['language_show']) {
+        $fields['langcode'] = clone $base_field_definitions['langcode'];
+        $fields['langcode']->setDisplayOptions('form', array(
+          'type' => 'language',
+          'weight' => 0,
+        ))
+        ->setDisplayConfigurable('form', TRUE);
       }
     }
 
diff --git a/core/modules/node/lib/Drupal/node/NodeFormController.php b/core/modules/node/lib/Drupal/node/NodeFormController.php
index fb05d6b..f18bd03 100644
--- a/core/modules/node/lib/Drupal/node/NodeFormController.php
+++ b/core/modules/node/lib/Drupal/node/NodeFormController.php
@@ -289,11 +289,6 @@ public function validate(array $form, array &$form_state) {
       $this->setFormError('uid', $form_state, $this->t('The username %name does not exist.', array('%name' => $form_state['values']['uid'][0]['value'])));
     }
 
-    // Validate the "authored on" field.
-    if ($form_state['values']['created'][0]['value'] < 0) {
-      $this->setFormError('date', $form_state, $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.
@@ -391,16 +386,9 @@ public function buildEntity(array $form, array &$form_state) {
 
     $entity->setOwnerId($form_state['values']['uid'][0]['value']);
 
-    if ($form_state['values']['created'][0]['value'] >= 0) {
-      $entity->setCreatedTime($form_state['values']['created'][0]['value']);
-    }
-    else {
-      $entity->setCreatedTime(REQUEST_TIME);
-    }
     return $entity;
   }
 
-
   /**
    * Overrides Drupal\Core\Entity\EntityFormController::save().
    */
diff --git a/core/modules/node/lib/Drupal/node/Tests/MultiStepNodeFormBasicOptionsTest.php b/core/modules/node/lib/Drupal/node/Tests/MultiStepNodeFormBasicOptionsTest.php
index 67bdbe3..5620a8f 100644
--- a/core/modules/node/lib/Drupal/node/Tests/MultiStepNodeFormBasicOptionsTest.php
+++ b/core/modules/node/lib/Drupal/node/Tests/MultiStepNodeFormBasicOptionsTest.php
@@ -62,13 +62,13 @@ function testMultiStepNodeFormBasicOptions() {
 
     $edit = array(
       'title[0][value]' => 'a',
-      'promote' => FALSE,
-      'sticky' => 1,
+      'promote[0][value]' => FALSE,
+      'sticky[0][value]' => 1,
       "{$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-0-value', 'promote stayed unchecked');
+    $this->assertFieldChecked('edit-sticky-0-value', 'sticky stayed checked');
   }
 
 }
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/LegacyTest.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/LegacyTest.php
index 37a1f53..b45c929 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/LegacyTest.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Tests/LegacyTest.php
@@ -38,8 +38,8 @@ function testTaxonomyLegacyNode() {
     $date = new DrupalDateTime('1969-01-01 00:00:00');
     $edit = array();
     $edit['title[0][value]'] = $this->randomName();
-    $edit['created[0][value][date]'] = $date->format($date_format);
-    $edit['created[0][value][time]'] = $date->format($time_format);
+    $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->randomName();
     $edit['field_tags'] = $this->randomName();
     $this->drupalPostForm('node/add/article', $edit, t('Save and publish'));
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldWidget/TextareaWidget.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldWidget/TextareaWidget.php
index 7785369..8474b2b 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldWidget/TextareaWidget.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldWidget/TextareaWidget.php
@@ -19,7 +19,7 @@
  *   label = @Translation("Text area (multiple rows)"),
  *   field_types = {
  *     "text_long",
- *     "string",
+ *     "string_long",
  *   },
  *   settings = {
  *     "rows" = "5",