What's wrong with Unix? Or is the complaint that there's no data type for time stamps specifically?

I agree it would be nice to have something with more data types. Binary b64/hex would be nice.

For a basic timestamp use a number.

If you need more, you enter territory that is much too complex to build into the "simplest data format" spec.

Yeah. But I think the goal was here to sugar the syntax while keeping semantics intact.