What time zone format do I send?

[MelGrubb]

When I retrieve records from the raw REST API, I can see that there are separate fields in the json like this:

      "time_zone": "Eastern Time (US & Canada)",
      "iana_time_zone": "America/New_York",

In the API library, though, there is a single field on User called "TimeZone". I'm assuming it matches up to the "time_zone" field, but that's a goofy format that nobody really uses, at least not behind the scenes. I don't see a way to send normal/standard/sane IANA time zones in to the User.CreateOrUpdate method, so does anyone know whether Zendesk will properly figure it out based on format or whether I have to do some translation of my own?