diff --git a/core/lib/Drupal/Core/Entity/ContentEntityForm.php b/core/lib/Drupal/Core/Entity/ContentEntityForm.php
index 1fd99dc..d0b5311 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityForm.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityForm.php
@@ -65,6 +65,15 @@ public function form(array $form, FormStateInterface $form_state) {
   /**
    * {@inheritdoc}
    */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    parent::submitForm($form, $form_state);
+    // Update the changed timestamp of the entity.
+    $this->updateChangedTime($this->entity);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function buildEntity(array $form, FormStateInterface $form_state) {
     /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
     $entity = parent::buildEntity($form, $form_state);
@@ -269,4 +278,18 @@ public function updateFormLangcode($entity_type_id, EntityInterface $entity, arr
     }
   }
 
+  /**
+   * Updates the changed time of the entity.
+   *
+   * Applies only if the entity implements the EntityChangedInterface.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity updated with the submitted values.
+   */
+  public function updateChangedTime(EntityInterface $entity) {
+    if ($entity->getEntityType()->isSubclassOf('Drupal\Core\Entity\EntityChangedInterface')) {
+      $entity->setChangedTime(REQUEST_TIME);
+    }
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Entity/EntityChangedInterface.php b/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
index 5f031a3..2bd29ed 100644
--- a/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
+++ b/core/lib/Drupal/Core/Entity/EntityChangedInterface.php
@@ -30,6 +30,16 @@
   public function getChangedTime();
 
   /**
+   * Sets the timestamp of the last entity change for the current translation.
+   *
+   * @param int $timestamp
+   *   The timestamp of the last entity save operation.
+   *
+   * @return $this
+   */
+  public function setChangedTime($timestamp);
+
+  /**
    * Gets the timestamp of the last entity change across all translations.
    *
    * @return int
diff --git a/core/lib/Drupal/Core/Entity/EntityChangedTrait.php b/core/lib/Drupal/Core/Entity/EntityChangedTrait.php
index 5b34d1a..416d4aa 100644
--- a/core/lib/Drupal/Core/Entity/EntityChangedTrait.php
+++ b/core/lib/Drupal/Core/Entity/EntityChangedTrait.php
@@ -28,4 +28,26 @@ public function getChangedTimeAcrossTranslations() {
     return $changed;
   }
 
+  /**
+   * Gets the timestamp of the last entity change for the current translation.
+   *
+   * @return int
+   *   The timestamp of the last entity save operation.
+   */
+  public function getChangedTime() {
+    return $this->get('changed')->value;
+  }
+
+  /**
+   * Sets the timestamp of the last entity change for the current translation.
+   *
+   * @param int $timestamp
+   *   The timestamp of the last entity save operation.
+   *
+   * @return $this
+   */
+  public function setChangedTime($timestamp) {
+    $this->set('changed', $timestamp);
+    return $this;
+  }
 }
diff --git a/core/modules/block_content/src/Entity/BlockContent.php b/core/modules/block_content/src/Entity/BlockContent.php
index 4e186b9..efde655 100644
--- a/core/modules/block_content/src/Entity/BlockContent.php
+++ b/core/modules/block_content/src/Entity/BlockContent.php
@@ -220,13 +220,6 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
   /**
    * {@inheritdoc}
    */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getRevisionLog() {
     return $this->get('revision_log')->value;
   }
diff --git a/core/modules/comment/src/Entity/Comment.php b/core/modules/comment/src/Entity/Comment.php
index fc3411e..a472458 100644
--- a/core/modules/comment/src/Entity/Comment.php
+++ b/core/modules/comment/src/Entity/Comment.php
@@ -524,13 +524,6 @@ public function setThread($thread) {
   /**
    * {@inheritdoc}
    */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public static function preCreate(EntityStorageInterface $storage, array &$values) {
     if (empty($values['comment_type']) && !empty($values['field_name']) && !empty($values['entity_type'])) {
       $field_storage = FieldStorageConfig::loadByName($values['entity_type'], $values['field_name']);
diff --git a/core/modules/content_translation/src/ContentTranslationHandler.php b/core/modules/content_translation/src/ContentTranslationHandler.php
index 10cf5f3..3bebd3c 100644
--- a/core/modules/content_translation/src/ContentTranslationHandler.php
+++ b/core/modules/content_translation/src/ContentTranslationHandler.php
@@ -579,7 +579,12 @@ public function entityFormEntityBuild($entity_type, EntityInterface $entity, arr
     $metadata->setAuthor(!empty($values['uid']) ? User::load($values['uid']) : User::load(0));
     $metadata->setPublished(!empty($values['status']));
     $metadata->setCreatedTime(!empty($values['created']) ? strtotime($values['created']) : REQUEST_TIME);
-    $metadata->setChangedTime(REQUEST_TIME);
+    // Each ContentEntityForm will update the changed timestamp on submit after
+    // the entity validation has ran. But if we set an metadata field for the
+    // translation metadata we have to update it here.
+    if ($entity->hasField('content_translation_changed')) {
+      $metadata->setChangedTime(REQUEST_TIME);
+    }
 
     $source_langcode = $this->getSourceLangcode($form_state);
     if ($source_langcode) {
diff --git a/core/modules/file/src/Entity/File.php b/core/modules/file/src/Entity/File.php
index 1a38c16..ae5ca76 100644
--- a/core/modules/file/src/Entity/File.php
+++ b/core/modules/file/src/Entity/File.php
@@ -113,13 +113,6 @@ public function getCreatedTime() {
   /**
    * {@inheritdoc}
    */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getOwner() {
     return $this->get('uid')->entity;
   }
diff --git a/core/modules/menu_link_content/src/Entity/MenuLinkContent.php b/core/modules/menu_link_content/src/Entity/MenuLinkContent.php
index abbc694..53e4fc0 100644
--- a/core/modules/menu_link_content/src/Entity/MenuLinkContent.php
+++ b/core/modules/menu_link_content/src/Entity/MenuLinkContent.php
@@ -135,13 +135,6 @@ public function getWeight() {
   /**
    * {@inheritdoc}
    */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getPluginDefinition() {
     $definition = array();
     $definition['class'] = 'Drupal\menu_link_content\Plugin\Menu\MenuLinkContent';
diff --git a/core/modules/node/src/Entity/Node.php b/core/modules/node/src/Entity/Node.php
index 0588ab0..d2c999e 100644
--- a/core/modules/node/src/Entity/Node.php
+++ b/core/modules/node/src/Entity/Node.php
@@ -234,13 +234,6 @@ public function setCreatedTime($timestamp) {
   /**
    * {@inheritdoc}
    */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function isPromoted() {
     return (bool) $this->get('promote')->value;
   }
@@ -499,6 +492,7 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDescription(t('Briefly describe the changes you have made.'))
       ->setRevisionable(TRUE)
       ->setTranslatable(TRUE)
+      ->setDefaultValue('')
       ->setDisplayOptions('form', array(
         'type' => 'string_textarea',
         'weight' => 25,
diff --git a/core/modules/node/src/Tests/NodeFormSaveChangedTimeTest.php b/core/modules/node/src/Tests/NodeFormSaveChangedTimeTest.php
new file mode 100644
index 0000000..3ba3a30
--- /dev/null
+++ b/core/modules/node/src/Tests/NodeFormSaveChangedTimeTest.php
@@ -0,0 +1,74 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\node\Tests\NodeFormSaveChangedTimeTest.
+ */
+
+namespace Drupal\node\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests updating the changed time after API and FORM entity save.
+ *
+ * @group node
+ */
+class NodeFormSaveChangedTimeTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array(
+    'node',
+  );
+
+  /**
+   * An user with permissions to create and edit articles.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $authorUser;
+
+  protected function setUp() {
+    parent::setUp();
+
+    // Create a node type.
+    $this->drupalCreateContentType(array(
+      'type' => 'article',
+      'name' => 'Article',
+    ));
+
+    $this->authorUser = $this->drupalCreateUser(['access content', 'create article content', 'edit any article content'], 'author');
+    $this->drupalLogin($this->authorUser);
+
+    // Create one node of the above node type .
+    $this->drupalCreateNode(array(
+      'type' => 'article',
+    ));
+  }
+
+  /**
+   * Test the changed time after API and FORM save without changes.
+   */
+  public function testChangedTimeAfterSaveWithoutChanges() {
+    $node = entity_load('node', 1);
+    $changed_timestamp = $node->getChangedTime();
+    debug($changed_timestamp, 'first time');
+
+    $node->save();
+    $node = entity_load('node', 1, TRUE);
+    $this->assertEqual($changed_timestamp, $node->getChangedTime(), 'The entity\'s changed time wasn\'t updated after API save without changes.');
+    debug($node->getChangedTime(), 'second time');
+    // Ensure different save timestamps.
+    sleep(2);
+    // Save the node on the regular node edit form.
+    $this->drupalPostForm('node/1/edit', array(), t('Save'));
+
+    $node = entity_load('node', 1, TRUE);
+    $this->assertNotEqual($changed_timestamp, $node->getChangedTime(), 'The entity\'s changed time was updated after form save without changes.');
+    debug($node->getChangedTime(), 'third time');
+  }
+}
diff --git a/core/modules/rest/src/Tests/RESTTestBase.php b/core/modules/rest/src/Tests/RESTTestBase.php
index 46003af..2fd66f6 100644
--- a/core/modules/rest/src/Tests/RESTTestBase.php
+++ b/core/modules/rest/src/Tests/RESTTestBase.php
@@ -356,6 +356,7 @@ protected function removeNodeFieldsForNonAdminUsers(NodeInterface $node) {
     $node->set('promote', NULL);
     $node->set('sticky', NULL);
     $node->set('revision_timestamp', NULL);
+    $node->set('revision_log', NULL);
     $node->set('uid', NULL);
 
     return $node;
diff --git a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestConstraints.php b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestConstraints.php
index 61200f7..e9e9bbf 100644
--- a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestConstraints.php
+++ b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestConstraints.php
@@ -46,12 +46,4 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
 
     return $fields;
   }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
 }
diff --git a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php
index 48c3ddc..67811ac 100644
--- a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php
+++ b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php
@@ -72,12 +72,4 @@ public function save() {
     sleep(1);
     parent::save();
   }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
 }
diff --git a/core/modules/taxonomy/src/Entity/Term.php b/core/modules/taxonomy/src/Entity/Term.php
index 2105a03..7020f0f 100644
--- a/core/modules/taxonomy/src/Entity/Term.php
+++ b/core/modules/taxonomy/src/Entity/Term.php
@@ -190,13 +190,6 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
   /**
    * {@inheritdoc}
    */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getDescription() {
     return $this->get('description')->value;
   }
diff --git a/core/modules/user/src/Entity/User.php b/core/modules/user/src/Entity/User.php
index 53155a0..8ea0dd4 100644
--- a/core/modules/user/src/Entity/User.php
+++ b/core/modules/user/src/Entity/User.php
@@ -378,13 +378,6 @@ public function setUsername($username) {
   /**
    * {@inheritdoc}
    */
-  public function getChangedTime() {
-    return $this->get('changed')->value;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function setExistingPassword($password) {
     $this->get('pass')->existing = $password;
   }