diff --git a/app/Admin/Controllers/CouponController.php b/app/Admin/Controllers/CouponController.php
index 2ddd145..b1daf4d 100644
--- a/app/Admin/Controllers/CouponController.php
+++ b/app/Admin/Controllers/CouponController.php
@@ -159,7 +159,7 @@ class CouponController extends AdminController
             $form->radio('discount_type')->options(config('coupon.discount_type'))->default(1)->required();
             $form->text('inventory')->width(2)->required()->type('number')->attribute('min', 1)->default(1);
            
-            $form->datetime('start_time')->width(3)->required()->value($startTime);
+            $form->datetime('start_time')->width(3)->required()->value('2020-08-24T03:18:57.000000Z');
             $form->datetime('end_time')->width(3)->required()->value($endTime);
             $form->datetime('usable_start_time')->width(3)->required()->value($usableStartTime);
             $form->datetime('usable_end_time')->width(3)->required()