Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling of time zone offsets
Jim Schaad <ietf@augustcellars.com> Wed, 08 July 2020 04:46 UTC
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From: Jim Schaad <ietf@augustcellars.com>
To: draft-ietf-cbor-date-tag@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> <B4E1605F-4C94-4EC6-B603-0BB725CEF34F@tzi.org>
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Date: Tue, 07 Jul 2020 21:46:27 -0700
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Subject: Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling of time zone offsets
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Mike, Based on the messages that I have seen, I would suggest the following actions: Create a new section dealing with the following: a) a definition of what calendar day means b) a definition of a term other than Unix Epoch to be used as the basis. This is a point in time rather than a calendar day so having this as the basis point seems to be generation frisson. It would appear that it is better to use 1970-01-01 as a POSIX calendar date epoch. c) Guidance on how to use two points in time to compute a calendar day count. d) Information on why it is a bad idea or how to compare a calendar date and a point in time. e) Guidance on how to compare two calendar dates (this should be easy). Jim > -----Original Message----- > From: CBOR <cbor-bounces@ietf.org> On Behalf Of Carsten Bormann > Sent: Friday, July 3, 2020 5:11 AM > To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> > Cc: draft-ietf-cbor-date-tag@ietf.org; Michael Richardson > <mcr+ietf@sandelman.ca>; cbor@ietf.org > Subject: Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling of time zone offsets > > 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 > > _______________________________________________ > CBOR mailing list > CBOR@ietf.org > https://www.ietf.org/mailman/listinfo/cbor
- [Cbor] draft-ietf-cbor-date-tag-02 - handling of … Juergen Schoenwaelder
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Henk Birkholz
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Juergen Schoenwaelder
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Henk Birkholz
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Henk Birkholz
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Michael Richardson
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Thiago Macieira
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Thiago Macieira
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Juergen Schoenwaelder
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Juergen Schoenwaelder
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Juergen Schoenwaelder
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Jim Schaad
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Mike Jones
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Michael Richardson
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Jim Schaad
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Carsten Bormann
- Re: [Cbor] draft-ietf-cbor-date-tag-02 - handling… Juergen Schoenwaelder
- Re: [Cbor] [EXTERNAL] Re: draft-ietf-cbor-date-ta… Mike Jones
- Re: [Cbor] [EXTERNAL] Re: draft-ietf-cbor-date-ta… Carsten Bormann
- Re: [Cbor] [EXTERNAL] Re: draft-ietf-cbor-date-ta… Henk Birkholz
- Re: [Cbor] [EXTERNAL] Re: draft-ietf-cbor-date-ta… Carsten Bormann