diff --git a/src/Illuminate/Database/Eloquent/Relations/Concerns/InteractsWithPivotTable.php b/src/Illuminate/Database/Eloquent/Relations/Concerns/InteractsWithPivotTable.php
index 83da64e83da7..80d619447886 100644
--- a/src/Illuminate/Database/Eloquent/Relations/Concerns/InteractsWithPivotTable.php
+++ b/src/Illuminate/Database/Eloquent/Relations/Concerns/InteractsWithPivotTable.php
@@ -313,6 +313,11 @@ protected function baseAttachRecord($id, $timed)
     protected function addTimestampsToAttachment(array $record, $exists = false)
     {
         $fresh = $this->parent->freshTimestamp();
+        
+        if ($this->using) {
+            $pivotModel = new $this->using;
+            $fresh = $fresh->format($pivotModel::getDateFormat());
+        }
 
         if (! $exists && $this->hasPivotColumn($this->createdAt())) {
             $record[$this->createdAt()] = $fresh;