diff --git a/src/Infrastructure/BotSharp.Abstraction/Utilities/StringExtensions.cs b/src/Infrastructure/BotSharp.Abstraction/Utilities/StringExtensions.cs
index ea6bb8ecf..0270133cc 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Utilities/StringExtensions.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Utilities/StringExtensions.cs
@@ -122,6 +122,11 @@ public static string ConvertToString<T>(this T? value, JsonSerializerOptions? js
             return s;
         }
 
+        if (value is DateTime d)
+        { 
+            return d.ToString("o");
+        }
+
         if (value is JsonElement elem
             && elem.ValueKind == JsonValueKind.String)
         {