diff --git a/app/Endpoint/Api/Http/Resources/BargainActivityResource.php b/app/Endpoint/Api/Http/Resources/BargainActivityResource.php
index cba46222..de65a757 100644
--- a/app/Endpoint/Api/Http/Resources/BargainActivityResource.php
+++ b/app/Endpoint/Api/Http/Resources/BargainActivityResource.php
@@ -21,6 +21,8 @@ class BargainActivityResource extends JsonResource
             'skus'      => ProductSkuSimpleResource::collection($this->whenLoaded('skus')),
             'share_image'=> $this->share_image ?? '',
             'share_title'=> $this->share_title ?? '',
+            'start_at' => $this->start_at->rawFormat('Y-m-d H:i:s'),
+            'end_at' => $this->end_at->rawFormat('Y-m-d H:i:s'),
         ];
     }
 }
diff --git a/app/Models/BargainActivity.php b/app/Models/BargainActivity.php
index 4356972f..387427fd 100644
--- a/app/Models/BargainActivity.php
+++ b/app/Models/BargainActivity.php
@@ -14,6 +14,8 @@ class BargainActivity extends Model
 
     protected $casts = [
         'images' => JsonArray::class,
+        'start_at' => 'datetime',
+        'end_at' => 'datetime',
     ];
 
     public static $enabledText = [