fix date formart

Author: Dickson-Mwendia

articles/active-directory/develop/includes/web-app/quickstart-aspnet.md

@@ -9,7 +9,7 @@ ms.service: active-directory
 ms.subservice: develop
 ms.topic: quickstart
 ms.workload: identity
-ms.date: 18/01/2023
+ms.date: 01/18/2023
 ms.author: dmwendia
 ms.reviewer: jmprieur
 ms.custom: "devx-track-csharp, aaddev, identityplatformtop40, scenarios:getting-started, languages:ASP.NET, contperf-fy21q1"