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

Doug Royer <douglasroyer@gmail.com> Fri, 12 December 2014 18:22 UTC

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Date: Fri, 12 Dec 2014 11:22:26 -0700
From: Doug Royer <douglasroyer@gmail.com>
Organization: http://SoftwareAndServices.NET
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References: <059.5da79d7c9d394e20e3c22513cfe04c33@tools.ietf.org> <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> <CADC+-gQN=Qb2y8M-bHnPzMcK8r=xUG-seQ7XzvZwwcWsHpHnBQ@mail.gmail.com> <54895986.6060806@lsces.co.uk> <5489CA90.1070307@gmail.com> <35BC5886C9A58F866E8A46A8@caldav.corp.apple.com> <5489D9F7.3080207@gmail.com> <D196D63077FEC1B090DF7C86@caldav.corp.apple.com> <5489F79E.4080909@gmail.com> <BC19CC6916DC0E59CA63737D@caldav.corp.apple.c om> <548A17A9.5040608@gmail.com> <6B7FDBF089F1058404AE2E47@cyrus.local>
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Subject: Re: [Tzdist] Fwd: [tzdist] #32 (service): managing historical data
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On 12/11/2014 07:31 PM, Cyrus Daboo wrote:
> Hi Doug,
>
> --On December 11, 2014 at 3:16:09 PM -0700 Doug Royer 
> <douglasroyer@gmail.com> wrote:
>
>> It gives the illusion of not being needed. But offline CUAs exist,
>> limited connectivity CUAs exist, and non-compliant CUAs will still 
>> exist.
>> How will you tell if nothing is sent?
>>
>> And it BREAKS ALL currently compliant CUAs.
>
> No - the whole point is most CUAs use their own built-in time zone 
> database - typically those provided by the system apis they use. That 
> is certainly the case for the majority of CalDAV clients. Most of 
> those clients simply throw away any VTIMEZONE in the in-coming data if 
> the TZID matches one they have internally. Some will even try matching 
> the incoming TZID with one in their local cache by expanding 
> observances and trying to find the best match. All of those clients 
> could be termed "offline" clients.
>
> I am not proposing changing iTIP right now - even though I suspect 
> many clients will work fine without them. The goal is to get tzdist 
> deployed and in use and then eventually change iTIP.
>

     Are you saying that CALDAV compliant CUA implementations are 
already REQUIRED to ignore the VTIMEZONE included?

         If YES, I see your point.
         If NO, then your breaking them - correct?

     Or are you saying that *ALL* CALDAV implementations currently 
ignore the VTIMEZONE (as in they are all broke) so the point is mute ?

-- 

Doug Royer - (http://K7DMR.us / http://DougRoyer.US)
DouglasRoyer@gmail.com
714-989-6135

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