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Re: [Tzdist] Fwd: [tzdist] #32 (service): managing historical data

Doug Royer <douglasroyer@gmail.com> Thu, 11 December 2014 00:13 UTC

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References: <059.5da79d7c9d394e20e3c22513cfe04c33@tools.ietf.org> <54788334.3010604@lsces.co.uk> <CADZyTkn92ZXnf0MOJjFH59eAYG_Bnu5FZ0x1UcoUq27MkRKZzA@mail.gmail.com> <5479E42A.8080306@lsces.co.uk> <CADZyTk=aVNFmoR1GA+w_xU7+-28Rnb-TJY4uT-jVOU4jdC1yKg@mail.gmail.com> <CACzrW9D=wZi1VvCiGa-4kwbKAyHMs6rduF6+cKA0Nn0gshm+sQ@mail.gmail.com> <54877E06.5020409@lsces.co.uk> <39981BA759F3923868CCFBD3@caldav.corp.apple.com> <54888249.9080607@lsces.co.uk> <CAFpi07z8NauUZ5aBqqg9sXDsmSA+hG4HuZNDkLe7fnk=mg4wgA@mail.gmail.com> <676B23282D9F7F1DCE6A54C7@caldav.corp.apple.com> <CAFpi07x79gJLEBWmpxWv7V13CiwmeKGy7bwS1=+ukp-sKmwFxA@mail.gmail.com> <5488921B.8020900@lsces.co.uk> <5488973F.7050400@andrew.cmu.edu> <54889C39.1080103@lsces.co.uk> <D2BE5C3BFE11019ECF4BEF62@caldav.corp.apple.com> <5488A6E6.8050903@lsces.co.uk> <CADC+-gTiyJ4QHZT6m3je9M9-ifSELnSWgmgy7iXSWNS+p8pthg@mail.gmail.com> <5488C0EA.8090505@lsces.co.uk> <CADC+-gTgckSe1ca6Sai6RguQid=ReM7bH6K8+dVVFm-YfbpFbA@mail.gmail.com> <5488DA56.2090306@lsces.co.uk>
Date: Wed, 10 Dec 2014 17:13:47 -0700
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From: Doug Royer <douglasroyer@gmail.com>
Cc: Time Zone Data Distribution Service <tzdist@ietf.org>
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Subject: Re: [Tzdist] Fwd: [tzdist] #32 (service): managing historical data
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That is one way to do that. However in this debate, if the organizer has a
different TZ definition than you, you can map it to and from UTC all you
want, you might not show up at the correct time.

Not all user agents store the data in UTC, many store the original event
and VTIMEZONE and map it as needed. If you do not use the TZ they specify,
you could show up, call, watch, whatever at technically the correct time,
but not when they are expecting you.





-
Doug Royer
DouglasRoyer@gmail.com
(714)989-6135

On Wed, Dec 10, 2014 at 4:42 PM, Lester Caine <lester@lsces.co.uk> wrote:

> On 10/12/14 22:06, Doug Royer wrote:
> > You use the organizers TZ rules. If your user agent wants to map that
> > into your time, then great. But it still has to match what they will
> host.
> >
> > Its not local time. Its organizers time.
>
> Multiple time zone events are managed using UTC time with local
> conversions to plan at each location. The local organisers schedule
> around the UTC planned base. But this is irrelevant when it comes to
> ensuring that what was published 6 months ago is still valid today.
> Without the version process tzdist is just a waste of time. We will need
> a replacement that actually works for archived data, be that historic or
> current calendars, and events that may be affected by changes in offsets
> in the future. Todays published data is tomorrows history and requires
> access to todays normalizing data to ensure the date is not corrupted
> later.
>
> --
> Lester Caine - G8HFL
> -----------------------------
> Contact - http://lsces.co.uk/wiki/?page=contact
> L.S.Caine Electronic Services - http://lsces.co.uk
> EnquirySolve - http://enquirysolve.com/
> Model Engineers Digital Workshop - http://medw.co.uk
> Rainbow Digital Media - http://rainbowdigitalmedia.co.uk
>
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