diff --git a/core/lib/Drupal/Core/Datetime/Element/Datetime.php b/core/lib/Drupal/Core/Datetime/Element/Datetime.php
index 87732b0..10e39a0 100644
--- a/core/lib/Drupal/Core/Datetime/Element/Datetime.php
+++ b/core/lib/Drupal/Core/Datetime/Element/Datetime.php
@@ -338,7 +338,7 @@ public static function processDatetime(&$element, FormStateInterface $form_state
     }
 
     // Expose a timezone selector.
-    if ($element['#expose_timezone']) {
+    if (!empty($element['#expose_timezone']) && $element['#expose_timezone']) {
       $element['timezone'] = array(
         '#type' => 'select',
         '#options' => array_combine(\DateTimeZone::listIdentifiers(), \DateTimeZone::listIdentifiers()),