diff --git a/core/lib/Drupal/Core/Render/Element/Date.php b/core/lib/Drupal/Core/Render/Element/Date.php
index 607d243..2c96fff 100644
--- a/core/lib/Drupal/Core/Render/Element/Date.php
+++ b/core/lib/Drupal/Core/Render/Element/Date.php
@@ -27,17 +27,13 @@ class Date extends FormElement {
    */
   public function getInfo() {
     $class = get_class($this);
-    return array(
+    return [
       '#input' => TRUE,
       '#theme' => 'input__date',
-      '#process' => array(
-        array($class, 'processDate'),
-      ),
-      '#pre_render' => array(
-        array($class, 'preRenderDate'),
-      ),
-      '#theme_wrappers' => array('form_element'),
-    );
+      '#process' => [[$class, 'processDate']],
+      '#pre_render' => [[$class, 'preRenderDate']],
+      '#theme_wrappers' => ['form_element'],
+    ];
   }
 
   /**
@@ -60,7 +56,7 @@ public static function processDate(&$element, FormStateInterface $form_state, &$
     // Attach JS support, if we can determine which date format should be used.
     if ($element['#attributes']['type'] == 'date' && !empty($element['#date_date_format'])) {
       $element['#attached']['library'][] = 'core/drupal.date';
-      $element['#attributes']['data-drupal-date-format'] = array($element['#date_date_format']);
+      $element['#attributes']['data-drupal-date-format'] = [$element['#date_date_format']];
     }
     return $element;
   }