diff --git a/modules/opd_presentations/tests/src/Functional/Entity/PresentationTest.php b/modules/opd_presentations/tests/src/Functional/Entity/PresentationTest.php
index 7e9dcf5ec..478f06b69 100644
--- a/modules/opd_presentations/tests/src/Functional/Entity/PresentationTest.php
+++ b/modules/opd_presentations/tests/src/Functional/Entity/PresentationTest.php
@@ -15,9 +15,9 @@ final class PresentationTest extends ExistingSiteBase {
   public function test_only_past_events_are_returned(): void {
     $presentation = $this->createPresentation(
       events: [
-        $this->createEvent(['field_date' => (new DrupalDateTime('now'))->format('U')]),
-        $this->createEvent(['field_date' => (new DrupalDateTime('yesterday'))->format('U')]),
-        $this->createEvent(['field_date' => (new DrupalDateTime('tomorrow'))->format('U')]),
+        $this->createEvent(['field_date' => (new DrupalDateTime('now'))->getTimestamp()]),
+        $this->createEvent(['field_date' => (new DrupalDateTime('yesterday'))->getTimestamp()]),
+        $this->createEvent(['field_date' => (new DrupalDateTime('tomorrow'))->getTimestamp()]),
       ],
     );