diff --git a/core/lib/Drupal/Core/Datetime/Date.php b/core/lib/Drupal/Core/Datetime/Date.php
index dbd3dcf..67d6519 100644
--- a/core/lib/Drupal/Core/Datetime/Date.php
+++ b/core/lib/Drupal/Core/Datetime/Date.php
@@ -110,13 +110,13 @@ public function format($timestamp, $type = 'medium', $format = '', $timezone = N
     $key = $date->canUseIntl() ? DrupalDateTime::INTL : DrupalDateTime::PHP;
 
     // If we have a non-custom date format use the provided date format pattern.
-    if ($date_format = $this->dateFormat($type)) {
+    if ($date_format = $this->dateFormat($type, $langcode)) {
       $format = $date_format->getPattern($key);
     }
 
     // Fall back to medium if a format was not found.
     if (empty($format)) {
-      $format = $this->dateFormat('fallback')->getPattern($key);
+      $format = $this->dateFormat('fallback')->getPattern($key, $langcode);
     }
 
     // Call $date->format().
@@ -127,11 +127,35 @@ public function format($timestamp, $type = 'medium', $format = '', $timezone = N
     return Xss::filter($date->format($format, $settings));
   }
 
-  protected function dateFormat($format) {
-    if (!isset($this->dateFormats[$format])) {
-      $this->dateFormats[$format] = $this->dateFormatStorage->load($format);
+  /**
+   * Loads the given format pattern for the given langcode.
+   *
+   * @param string $format The machine name of the date format.
+   * @param string $langcode The langcode of the language to use.
+   * If NULL, we load the interface language format pattern.
+   * @return string The pattern for the date format in the given language.
+   */
+  protected function dateFormat($format, $langcode = NULL) {
+    // If a langcode is not given, we use the interface language.
+    $needs_language_context = !empty($langcode);
+    if (!$needs_language_context) {
+      $langcode = $this->languageManager->getLanguage(Language::TYPE_INTERFACE)->id;
+    }
+    if (!isset($this->dateFormats[$format][$langcode])) {
+      // Enter a language specific context for the language if some language is
+      // given, so the right date format is loaded.
+      $needs_language_context = $needs_language_context &&
+          \Drupal::moduleHandler()->moduleExists('language');
+      if ($needs_language_context) {
+        $language_context = config_context_enter('Drupal\language\LanguageConfigContext');
+        $language_context->setLanguage(new Language(array('id' => $langcode)));
+      }
+      $this->dateFormats[$format][$langcode] = $this->dateFormatStorage->load($format);
+      if ($needs_language_context) {
+        config_context_leave();
+      }
     }
-    return $this->dateFormats[$format];
+    return $this->dateFormats[$format][$langcode];
   }
 
   /**
diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php
index 7299826..a783826 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php
@@ -89,6 +89,37 @@ function testConfigTranslation() {
     $this->drupalGet($langcode);
     $this->assertText($site_name, 'The translated site name is displayed after translations refreshed.');
 
+    // Check default medium date format exists and create a translation for it.
+    $string = $this->storage->findString(array('source' => 'D, m/d/Y - H:i', 'context' => '', 'type' => 'configuration'));
+    $this->assertTrue($string, 'Configuration date formats have been created upon installation.');
+
+    // Translate using the UI so configuration is refreshed.
+    $site_name = $this->randomName(20);
+    $search = array(
+      'string' => $string->source,
+      'langcode' => $langcode,
+      'translation' => 'all',
+    );
+    $this->drupalPostForm('admin/config/regional/translate', $search, t('Filter'));
+    $textareas = $this->xpath('//textarea');
+    $textarea = current($textareas);
+    $lid = (string) $textarea[0]['name'];
+    $edit = array(
+      $lid => 'D',
+    );
+    $this->drupalPostForm('admin/config/regional/translate', $edit, t('Save translations'));
+
+    $wrapper = $this->container->get('locale.config.typed')->get('system.date_format.medium');
+
+    // Get translation and check we've only got the site name.
+    $translation = $wrapper->getTranslation($langcode);
+    $format = $translation->get('pattern')->get('php')->getValue();
+    $this->assertEqual($format, 'D', 'Got the right date format pattern after translation.');
+
+    // Formatting the date 8 / 27 / 1985 @ 13:37 EST with pattern D should display "Tue".
+    $formatted_date = format_date(494015820, $type = 'medium', NULL, NULL, $langcode = $langcode);
+    $this->assertEqual($formatted_date, 'Tue', 'Got the right formatted date using the date format translation pattern.');
+
     // Assert strings from image module config are not available.
     $string = $this->storage->findString(array('source' => 'Medium (220x220)', 'context' => '', 'type' => 'configuration'));
     $this->assertFalse($string, 'Configuration strings have been created upon installation.');
diff --git a/core/modules/system/config/schema/system.data_types.schema.yml b/core/modules/system/config/schema/system.data_types.schema.yml
index 7c5a420..ab375b6 100644
--- a/core/modules/system/config/schema/system.data_types.schema.yml
+++ b/core/modules/system/config/schema/system.data_types.schema.yml
@@ -53,6 +53,12 @@ text:
   label: 'Text'
   translatable: true
 
+# PHP Date format string that is translatable.
+date_format:
+  type: string
+  label: 'PHP date format'
+  translatable: true
+
 # Complex extended data types:
 
 # Mail text with subject and body parts.
diff --git a/core/modules/system/config/schema/system.schema.yml b/core/modules/system/config/schema/system.schema.yml
index 82fcec6..020e9d3 100644
--- a/core/modules/system/config/schema/system.schema.yml
+++ b/core/modules/system/config/schema/system.schema.yml
@@ -141,7 +141,7 @@ system.date_format.*:
       label: 'Format string'
       mapping:
         php:
-          type: string
+          type: date_format
           label: 'PHP date format'
         intl:
           type: string