Re: [Tzdist] shepherd review and issues for draft-ietf-tzdist-caldav-timezone-ref

[Steve Allen <[e-mail]>]

On Thu 2015-06-11T11:33:10 -0400, Cyrus Daboo hath writ:
> >Section 3.1.3:
> >
> >>
> >>   If the
> >>   "vtimezone=no" preference is set by a client on any HTTP request that
> >>   returns iCalendar data, then the server MUST NOT return any
> >>   "VTIMEZONE" components if the time zone identifier matches one
> >>   provided by any of the advertised time zone distribution servers (see
> >>   Section 3.1.2).  However, the server MUST return the appropriate
> >>   "VTIMEZONE" component for each time zone with an identifier not
> >>   available on the advertised time zone distribution servers.
> >
> >
> >I understand the intent here.  In what circumstance would the server and
> >client both be aware of a timezone that the tzdist service is not, and
> >is that an error or simply local configuration?  My point: if this is a
> >case that won't happen, let's not clutter the text.
>
> It is possible a non-standard time zone has been sent in an iTIP
> (scheduling message) to an attendee and they have stored that on
> their CalDAV server. In that case the correct thing to do is
> maintain the original VTIMEZONE component in the data as the
> attendee is not really allowed to "coerce" it into the closest match
> standard TZID, as that could cause problems with any replies they
> send back. I do think this is a situation that will happen a fair
> bit as we wait for everyone to start using tzdist and get IANA tzids
> used everywhere.

I think this situation will happen indefinitely.  The Lick Observatory
telescope schedules have always operated in a time zone where the new
day begins at noon PST, or 20 hours behind Greenwich.  This will never
be a standard timezone, but the de facto practice is unlikely to change.

--
Steve Allen                 <[e-mail]>               WGS-84 (GPS)
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