diff --git a/core/lib/Drupal/Core/Render/Element/Date.php b/core/lib/Drupal/Core/Render/Element/Date.php
index 91c8c1e101..86f6413c62 100644
--- a/core/lib/Drupal/Core/Render/Element/Date.php
+++ b/core/lib/Drupal/Core/Render/Element/Date.php
@@ -34,6 +34,7 @@ public function getInfo() {
       '#theme' => 'input__date',
       '#process' => [
         [$class, 'processAjaxForm'],
+        [$class, 'processDate'],
       ],
       '#pre_render' => [[$class, 'preRenderDate']],
       '#theme_wrappers' => ['form_element'],