diff --git a/core/modules/datetime/src/DateTimeComputed.php b/core/modules/datetime/src/DateTimeComputed.php
index f97e5a0c7b..358730b264 100644
--- a/core/modules/datetime/src/DateTimeComputed.php
+++ b/core/modules/datetime/src/DateTimeComputed.php
@@ -46,8 +46,7 @@ public function getValue() {
     $item = $this->getParent();
     $value = $item->{($this->definition->getSetting('date source'))};
 
-    // A date cannot be created from a NULL value.
-    if ($value === NULL) {
+    if (!is_string($value) && $value !== '') {
       return NULL;
     }