diff --git a/core/core.services.yml b/core/core.services.yml
index a827835..e383fde 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -555,7 +555,7 @@ services:
     arguments: ['@module_handler']
   date:
     class: Drupal\Core\Datetime\Date
-    arguments: ['@entity.manager', '@language_manager']
+    arguments: ['@entity.manager', '@language_manager', '@config.factory']
   feed.bridge.reader:
     class: Drupal\Component\Bridge\ZfExtensionManagerSfContainer
     calls:
diff --git a/core/modules/language/lib/Drupal/language/LanguageConfigContext.php b/core/lib/Drupal/Core/Config/Context/LanguageConfigContext.php
similarity index 90%
rename from core/modules/language/lib/Drupal/language/LanguageConfigContext.php
rename to core/lib/Drupal/Core/Config/Context/LanguageConfigContext.php
index 58b83a6..2c9acaa 100644
--- a/core/modules/language/lib/Drupal/language/LanguageConfigContext.php
+++ b/core/lib/Drupal/Core/Config/Context/LanguageConfigContext.php
@@ -2,10 +2,10 @@
 
 /**
  * @file
- * Contains \Drupal\language\LanguageConfigContext.
+ * Contains \Drupal\Core\Config\Context\LanguageConfigContext.
  */
 
-namespace Drupal\language;
+namespace Drupal\Core\Config\Context;
 
 use Drupal\Core\Config\Context\ConfigContext;
 use Drupal\Core\Language\Language;
diff --git a/core/lib/Drupal/Core/Datetime/Date.php b/core/lib/Drupal/Core/Datetime/Date.php
index dbd3dcf..72c68f0 100644
--- a/core/lib/Drupal/Core/Datetime/Date.php
+++ b/core/lib/Drupal/Core/Datetime/Date.php
@@ -8,6 +8,8 @@
 namespace Drupal\Core\Datetime;
 
 use Drupal\Component\Utility\Xss;
+use Drupal\Core\Config\ConfigFactory;
+use Drupal\Core\Config\Context\LanguageConfigContext;
 use Drupal\Core\Datetime\DrupalDateTime;
 use Drupal\Core\Entity\EntityManager;
 use Drupal\Core\Language\Language;
@@ -39,6 +41,13 @@ class Date {
    */
   protected $languageManager;
 
+  /**
+   * Config factory for handling language contexts for date formats.
+   *
+   * @var \Drupal\Core\Config\ConfigFactory
+   */
+  protected $configFactory;
+
   protected $country = NULL;
   protected $dateFormats = array();
 
@@ -50,9 +59,10 @@ class Date {
    * @param \Drupal\Core\Language\LanguageManager $language_manager
    *   The language manager.
    */
-  public function __construct(EntityManager $entity_manager, LanguageManager $language_manager) {
+  public function __construct(EntityManager $entity_manager, LanguageManager $language_manager, ConfigFactory $config_factory) {
     $this->dateFormatStorage = $entity_manager->getStorageController('date_format');
     $this->languageManager = $language_manager;
+    $this->configFactory = $config_factory;
   }
 
   /**
@@ -110,13 +120,13 @@ 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 $date->format().
@@ -127,11 +137,44 @@ public function format($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 $langcode
+   *   The langcode of the language to use. If NULL, we load the current context
+   *   language if any or the interface language format pattern as the last fallback.
+   * @return string
+   *   The pattern for the date format in the given language.
+   */
+  protected function dateFormat($format, $langcode = NULL) {
+    // If a langcode is not given, we use the interface language.
+    $needs_language_context = !empty($langcode);
+    if (!$needs_language_context) {
+      // If we are at any context we try to get the language from there.
+      $context = $this->configFactory->getContext();
+      if ($context !== NULL && $contextLanguage = $context->get(LanguageConfigContext::LANGUAGE_KEY)) {
+        $langcode = $contextLanguage;
+      }
+      else {
+        $langcode = $this->languageManager->getLanguage(Language::TYPE_INTERFACE)->id;
+        $needs_language_context = TRUE;
+      }
+    }
+    if (!isset($this->dateFormats[$format][$langcode])) {
+      // Enter a language specific context for the language if some language is
+      // given, so the right date format is loaded.
+      if ($needs_language_context) {
+        $language_context = config_context_enter('Drupal\Core\Config\Context\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/config/lib/Drupal/config/Tests/ConfigLocaleOverride.php b/core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverride.php
index f3f3ea6..24edb76 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverride.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigLocaleOverride.php
@@ -170,7 +170,7 @@ function testConfigLocaleLanguageOverride() {
     )));
 
     $language = language_load('fr');
-    $language_config_context = config_context_enter('Drupal\language\LanguageConfigContext');
+    $language_config_context = config_context_enter('Drupal\Core\Config\Context\LanguageConfigContext');
     $language_config_context->setLanguage($language);
     $config = \Drupal::config('config_test.system');
     $this->assertIdentical($config->get('foo'), 'fr bar');
@@ -196,7 +196,7 @@ function testConfigLocaleLanguageOverride() {
     // Enter an english context on top of the german context.
     $language = language_load('en');
     // Create a new language config context to stack on top of the existing one.
-    $en_language_config_context = config_context_enter('Drupal\language\LanguageConfigContext');
+    $en_language_config_context = config_context_enter('Drupal\Core\Config\Context\LanguageConfigContext');
     $en_language_config_context->setLanguage($language);
     $config = \Drupal::config('config_test.system');
     $this->assertIdentical($config->get('foo'), 'en bar');
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