diff --git a/core/lib/Drupal/Core/Datetime/DateFormatter.php b/core/lib/Drupal/Core/Datetime/DateFormatter.php
index 6bbd77f..08faaee 100644
--- a/core/lib/Drupal/Core/Datetime/DateFormatter.php
+++ b/core/lib/Drupal/Core/Datetime/DateFormatter.php
@@ -196,11 +196,11 @@ public function formatInterval($interval, $granularity = 2, $langcode = NULL) {
    * Provides all date format characters value for given timestamp.
    *
    * @param string|null $langcode
-   *   Language code of date format.
+   *   Language code of date format. Use site default language, if not provided.
    * @param int|null $timestamp
-   *   Unix timestamp.
+   *   Unix timestamp to format. Use REQUEST_TIME if not provided.
    * @param string|null $timezone
-   *   String timezone.
+   *   String timezone. Use site default timezone, if not provided.
    *
    * @return array
    *   An array of formatted date value indexed by date character.
diff --git a/core/modules/config_translation/src/FormElement/ListElement.php b/core/modules/config_translation/src/FormElement/ListElement.php
index 8ec68a6..3a0c138 100644
--- a/core/modules/config_translation/src/FormElement/ListElement.php
+++ b/core/modules/config_translation/src/FormElement/ListElement.php
@@ -107,7 +107,7 @@ public function getFormAttributes() {
         if (empty($form_attributes)) {
           continue;
         }
-        $attributes +=  $form_attributes;
+        $attributes += $form_attributes;
       }
     }
     return $attributes;
diff --git a/core/modules/system/js/system.date.js b/core/modules/system/js/system.date.js
index 7ba36e0..6a73753 100644
--- a/core/modules/system/js/system.date.js
+++ b/core/modules/system/js/system.date.js
@@ -20,7 +20,6 @@
         $target: $target
       };
 
-
       /**
        * Callback to check if the given character has a date value.
        *