diff --git a/core/modules/datetime/config/schema/datetime.schema.yml b/core/modules/datetime/config/schema/datetime.schema.yml
index 2dd447f..406a2fd 100644
--- a/core/modules/datetime/config/schema/datetime.schema.yml
+++ b/core/modules/datetime/config/schema/datetime.schema.yml
@@ -29,10 +29,6 @@ field.formatter.settings.datetime_base:
     timezone_override:
       type: string
       label: 'Time zone override'
-    append_timezone:
-      type: boolean
-      label: 'Append time zone'
-
 
 field.formatter.settings.datetime_default:
   type: field.formatter.settings.datetime_base
diff --git a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeCustomFormatter.php b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeCustomFormatter.php
index c1120cd..4b18b16 100644
--- a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeCustomFormatter.php
+++ b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeCustomFormatter.php
@@ -53,7 +53,7 @@ public function viewElements(FieldItemListInterface $items) {
         $output = $date->format($this->getSetting('date_format'));
       }
       $elements[$delta] = [
-        '#markup' => $this->appendTimezone($output),
+        '#markup' => $output,
         '#cache' => [
           'contexts' => [
             'timezone',
@@ -89,7 +89,7 @@ public function settingsSummary() {
 
     $date = new DrupalDateTime();
     $this->setTimeZone($date);
-    $summary[] = $this->appendTimezone($date->format($this->getSetting('date_format')));
+    $summary[] = $date->format($this->getSetting('date_format'));
 
     return $summary;
   }
diff --git a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php
index 50412ab..418c229 100644
--- a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php
+++ b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeDefaultFormatter.php
@@ -160,8 +160,7 @@ public function viewElements(FieldItemListInterface $items) {
   protected function formatDate($date) {
     $format_type = $this->getSetting('format_type');
     $timezone = $this->getSetting('timezone_override');
-    $output = $this->dateFormatter->format($date->getTimestamp(), $format_type, '', $timezone != '' ? $timezone : null);
-    return $this->appendTimezone($output);
+    return $this->dateFormatter->format($date->getTimestamp(), $format_type, '', $timezone != '' ? $timezone : null);
   }
 
   /**
@@ -196,7 +195,7 @@ public function settingsSummary() {
     $summary = parent::settingsSummary();
 
     $date = new DrupalDateTime();
-    $summary[] = t('Format: @display', array('@display' => $this->appendTimezone($this->formatDate($date))));
+    $summary[] = t('Format: @display', array('@display' => $this->formatDate($date)));
 
     return $summary;
   }
diff --git a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeFormatterBase.php b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeFormatterBase.php
index 5342e6f..57ef996 100644
--- a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeFormatterBase.php
+++ b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeFormatterBase.php
@@ -23,7 +23,6 @@
   public static function defaultSettings() {
     return array(
       'timezone_override' => '',
-      'append_timezone' => FALSE,
     ) + parent::defaultSettings();
   }
 
@@ -41,13 +40,6 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
       '#default_value' => $this->getSetting('timezone_override'),
     );
 
-    $form['append_timezone'] = array(
-      '#type' => 'checkbox',
-      '#title' => $this->t('Append time zone'),
-      '#description' => $this->t('Append the time zone used to render the date'),
-      '#default_value' => $this->getSetting('append_timezone'),
-    );
-
     return $form;
   }
 
@@ -61,9 +53,8 @@ public function settingsSummary() {
     if ($override != '') {
       $replacements = array(
         '@timezone' => $this->getSetting('timezone_override'),
-        '@appended' => $this->getSetting('append_timezone') ? $this->t('(Appended)') : '',
       );
-      $summary[] = ($override != '') ? $this->t('Timezone: @timezone @appended', $replacements) : '';
+      $summary[] = ($override != '') ? $this->t('Timezone: @timezone', $replacements) : '';
     }
 
     return $summary;
@@ -84,27 +75,4 @@ protected function setTimeZone(DrupalDateTime $date) {
     }
   }
 
-  /**
-   * Appends the time zone used to render the DrupalDateTime object.
-   *
-   * @param string $rendered_date
-   *   A formatted date/time string.
-   *
-   * @return string
-   *   The passed-in string with the time zone appended if the 'append_timezone'
-   *   setting is TRUE.
-   */
-  protected function appendTimezone($rendered_date) {
-    $timezone = $this->getSetting('timezone_override');
-    if ($timezone != '' && $this->getSetting('append_timezone')) {
-      return SafeMarkup::format('@rendered_date (@timezone)', array(
-        '@rendered_date' => $rendered_date,
-        '@timezone' => $timezone,
-      ));
-    }
-    else {
-      return $rendered_date;
-    }
-  }
-
 }
diff --git a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimePlainFormatter.php b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimePlainFormatter.php
index cee83f5..17f4334 100644
--- a/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimePlainFormatter.php
+++ b/core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimePlainFormatter.php
@@ -51,7 +51,7 @@ public function viewElements(FieldItemListInterface $items) {
             'timezone',
           ],
         ],
-        '#markup' => $this->appendTimezone($output),
+        '#markup' => $output,
       ];
     }
 
diff --git a/core/modules/migrate_drupal/config/install/migrate.migration.d6_field_formatter_settings.yml b/core/modules/migrate_drupal/config/install/migrate.migration.d6_field_formatter_settings.yml
index 8dd6495..7b70fe6 100644
--- a/core/modules/migrate_drupal/config/install/migrate.migration.d6_field_formatter_settings.yml
+++ b/core/modules/migrate_drupal/config/install/migrate.migration.d6_field_formatter_settings.yml
@@ -232,23 +232,18 @@ process:
           default:
             format_type: fallback
             timezone_override: ''
-            append_timezone: false
           format_interval:
             format_type: fallback
             timezone_override: ''
-            append_timezone: false
           long:
             format_type: long
             timezone_override: ''
-            append_timezone: false
           medium:
             format_type: medium
             timezone_override: ''
-            append_timezone: false
           short:
             format_type: short
             timezone_override: ''
-            append_timezone: false
         text:
           trimmed:
             trim_length: 600
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldFormatterSettingsTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldFormatterSettingsTest.php
index efe1743..7780b2c 100644
--- a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldFormatterSettingsTest.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldFormatterSettingsTest.php
@@ -196,7 +196,7 @@ public function testEntityDisplaySettings() {
     $this->assertIdentical($expected, $component);
 
     // Test date field.
-    $defaults = array('format_type' => 'fallback', 'timezone_override' => '', 'append_timezone' => FALSE,);
+    $defaults = array('format_type' => 'fallback', 'timezone_override' => '',);
     $expected['weight'] = 10;
     $expected['type'] = 'datetime_default';
     $expected['settings'] = array('format_type' => 'fallback') + $defaults;