diff --git a/app/Http/Resources/TaskResource.php b/app/Http/Resources/TaskResource.php
index 53a4de1..9599c46 100644
--- a/app/Http/Resources/TaskResource.php
+++ b/app/Http/Resources/TaskResource.php
@@ -31,7 +31,7 @@ class TaskResource extends JsonResource
             'end_at' => (int) $this->end_at?->timestamp,
             'end_format' => $this->end_at?->format('Y年m月d日'),
             'created_at' => $this->created_at->timestamp,
-            'created_format' => $this->created_at->format('Y-m-d H:i:s'),
+            'created_format' => $this->created_at->format('Y-m-d'),
         ];
     }