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Questiona about timezones

Grahame Grieve <grahame@healthintersections.com.au> Wed, 26 September 2018 01:21 UTC

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From: Grahame Grieve <grahame@healthintersections.com.au>
Date: Wed, 26 Sep 2018 11:18:27 +1000
Message-ID: <CAG47hGZ+CMTqqLf86kjSdsxgUtM1cLYS12TasPLOJNrOieqe0g@mail.gmail.com>
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Subject: Questiona about timezones
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Hi

We've run into a problem with the FHIR HTTP API to do with timezones (FHIR
= HTTP API for healthcare). TImezones are hard to deal with, and we can't
nail everything down (duh!). There's cases where the server needs to know
the client's timezone to perform certain tasks correctly on behalf of the
client, and the client wants to know the server's timezone to fully
understand certain outputs

The classic response is for this to be handled by javascript client side,
but that doesn't work for a data (json) API. Note also that in principle,
servers should not have a timezone, but in practice, every clinical system
in the world does have a timezone, and it matters a whole lot. If we care
about legacy data, we have to have the client knowing what the server
defaults to... and we really care about legacy data. And various clinical
protocols have operational ties to timezones, not just offsets (giving
medications at the right time really does matter)

Has anyone got any comments on this?

I like the header described in
https://tools.ietf.org/html/draft-sharhalakis-httptz-05 and would specify
it for both directions, but that's not blessed by the http-wg?

Grahame

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