优化更新

app/Exports/UserExport.php

@@ -64,8 +64,8 @@ class UserExport implements FromCollection, WithHeadings, WithMapping, ShouldAut
             $user->department ? $user->department->name : '',
             $user->roles->pluck('name')->implode(','),
             $user->status == 1 ? '启用' : '禁用',
-            $user->last_login_at ? $user->last_login_at->toDateTimeString() : '',
-            $user->created_at ? $user->created_at->toDateTimeString() : '',
+            $user->last_login_at ? (string)$user->last_login_at : '',
+            $user->created_at ? (string)$user->created_at : '',
         ];
     }
 }