rmp_serde : Timestamp Question

Hello, I am porting some messagepack code from another language and need to deserialize Msgpack's [Timestamp](https://github.com/msgpack/msgpack/blob/master/spec.md#timestamp-extension-type) type. Are there any resources on how to do this?

I'm guessing I need to write some kind of custom deserializer for this value through Serde but wanted to make sure there wasn't an easier way first.