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Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling of time zone offsets

Carsten Bormann <cabo@tzi.org> Fri, 03 July 2020 12:11 UTC

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From: Carsten Bormann <cabo@tzi.org>
In-Reply-To: <20200703103212.kwl5pbxubznjqpf6@anna.jacobs.jacobs-university.de>
Date: Fri, 03 Jul 2020 14:11:00 +0200
Cc: draft-ietf-cbor-date-tag@ietf.org, Michael Richardson <mcr+ietf@sandelman.ca>, cbor@ietf.org
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References: <20200701072123.hnyhzemagtotnuyl@anna.jacobs.jacobs-university.de> <DD477DBD-3F3F-48FA-BADC-FF550CC3D4F7@tzi.org> <20200701090536.mqkfjebfzhz5phls@anna.jacobs.jacobs-university.de> <5244.1593618673@localhost> <04FEC6E5-F8E9-472D-A4D6-71C6C00D79E6@tzi.org> <20200703060820.ydmbdmp5fy2v6wgf@anna.jacobs.jacobs-university.de> <99A557CE-559D-409A-A3DC-5D20F2F55F5E@tzi.org> <20200703064652.m7tuvfcglxyvfque@anna.jacobs.jacobs-university.de> <2A137293-075C-4862-91C2-CC583B9B2FF6@tzi.org> <20200703103212.kwl5pbxubznjqpf6@anna.jacobs.jacobs-university.de>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
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Subject: Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling of time zone offsets
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On 2020-07-03, at 12:32, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> wrote:
> 
> PS: There are even events where there is no natural time zone that can
>    be associated with the event, like the first step on the moon.

(For those who weren’t there when it happened:)

Indeed, Monday, 1969-07-21T02:56:15Z.

Most Americans will tell you Sunday 1969-07-20 for the first steps.   The exact time was actually specifically chosen to occur on prime time TV in the US (and then was slightly delayed, but managed to stay in window), which spans several time zones, which all have this on 1969-07-20.

Yes, I agree we should have some text on this (not the moon landing, but the issues in converting between calendar dates and times anchored on time scales).

Grüße, Carsten

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