DateTimeOffset

Author: mongoKart

source/whats-new.txt

@@ -57,7 +57,10 @@ The 3.0 driver release includes the following new features:
   This type is available in .NET 5 and later.
   To learn more about the ``Half`` type, see the
   `Half Struct <https://learn.microsoft.com/en-us/dotnet/api/system.half?view=net-8.0>`__
-  API reference page on MSDN. 
+  API reference page on MSDN.
+
+- Serializes ``DateTimeOffset`` values as BSON documents, and the
+  ``DateTime`` values in these documents as milliseconds since the Unix epoch.
 
 .. _csharp-version-2.28: