diff --git a/Utils/RnG/DateTime.php b/Utils/RnG/DateTime.php
index 4df50aaac..5611182a3 100644
--- a/Utils/RnG/DateTime.php
+++ b/Utils/RnG/DateTime.php
@@ -39,6 +39,6 @@ class DateTime
      */
     public static function generateDateTime(\DateTime $start, \DateTime $end) : \DateTime
     {
-        return new \DateTime(date('Y-m-d H:i:s', mt_rand($startDate->getTimestamp(), $endDate->getTimestamp())));
+        return new \DateTime(date('Y-m-d H:i:s', mt_rand($start->getTimestamp(), $end->getTimestamp())));
     }
 }