diff --git a/Day/Q32024/Helper-2024-08-28.cs b/Day/Q32024/Helper-2024-08-28.cs
index 8b4c556..bc05d38 100644
--- a/Day/Q32024/Helper-2024-08-28.cs
+++ b/Day/Q32024/Helper-2024-08-28.cs
@@ -177,6 +177,7 @@ internal static partial class Helper20240828
                 continue;
             File.Move(fileInfo.FullName, checkFile);
             File.Delete(keyFile);
+            Directory.SetLastWriteTime(checkDirectory, fileInfo.LastWriteTime);
         }
         foreach (FileInfo fileInfo in collection)
         {