diff --git a/Models/BatchPosting.php b/Models/BatchPosting.php
index ef10d4a..0ca274c 100644
--- a/Models/BatchPosting.php
+++ b/Models/BatchPosting.php
@@ -119,7 +119,7 @@ class BatchPosting implements \Countable
      *
      * @since 1.0.0
      */
-    public function getCreatedAt() : \DateTime
+    public function getCreatedAt() : \DateTimeInterface
     {
         return $this->created;
     }