diff --git a/lib/Activity/ActivityManager.php b/lib/Activity/ActivityManager.php
index 3b3cd2423..165920b89 100644
--- a/lib/Activity/ActivityManager.php
+++ b/lib/Activity/ActivityManager.php
@@ -268,7 +268,9 @@ public function triggerUpdateEvents($objectType, ChangeSet $changeSet, $subject)
 					'before' => $previousEntity->$getter(),
 					'after' => $entity->$getter()
 				];
-				if ($changes['before'] !== $changes['after']) {
+				$beforeValue = $changes['before'] instanceof \DateTimeInterface ? $changes['before']->format('c') : $changes['before'];
+				$afterValue = $changes['after'] instanceof \DateTimeInterface ? $changes['after']->format('c') : $changes['after'];
+				if ($beforeValue !== $afterValue) {
 					try {
 						$event = $this->createEvent($objectType, $entity, $subjectComplete, $changes);
 						if ($event !== null) {