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app/admin/controller/coupon/CouponController.php

@@ -325,7 +325,7 @@ class CouponController extends Curd
                             $params['coupon_detail_deadline_datetime'] = $coupon['coupon_validdate_end'];
                         } elseif ($coupon['coupon_validdate_day'] > 0) {
                             $endUnix = strtotime($chooseCoupon['gain_datetime']);
-                            $params['coupon_detail_deadline_datetime'] = date('Y-m-d H:i:s', $endUnix + ($coupon['coupon_validdate_day'] * 24 * 3600));
+                            $params['coupon_detail_deadline_datetime'] = date('Y-m-d H:i:s', $endUnix + ($coupon['coupon_validdate_day'] * 24 * 3600) -1);
                         }
                         foreach ($memberList as $item) {
                             $params['member_id'] = $item;