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app/Http/Controllers/admin/ActivityReward.php

@@ -47,7 +47,7 @@ class ActivityReward extends Controller
                 'title' => ['required', 'string', 'min:1', 'max:140'],
                 'sub_title' => ['required', 'string', 'min:1', 'max:140'],
                 'start_time' => ['required', 'date', 'date_format:Y-m-d'],
-                'end_time' => ['required', 'date', 'date_format:Y-m-d'],
+                'end_time' => ['required', 'date', 'date_format:Y-m-d', 'after_or_equal:start_time'],
                 'detail_image' => ['required', 'url', 'regex:/\.(jpeg|jpg|png|webp)$/i'],
                 'status' => ['required', 'integer', 'min:0', 'max:1'],
             ]);