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Re: [saag] [art] Date formats: RFC3339 vs. RFC 5322

Stian Soiland-Reyes <soiland-reyes@manchester.ac.uk> Thu, 15 April 2021 10:30 UTC

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From: Stian Soiland-Reyes <soiland-reyes@manchester.ac.uk>
To: Phillip Hallam-Baker <ietf@hallambaker.com>, John C Klensin <john-ietf@jck.com>
CC: "General Area Review Team (gen-art@ietf.org)" <art@ietf.org>, "Eliot Lear (elear)" <elear=40cisco.com@dmarc.ietf.org>, Yakov Shafranovich <yakov@nightwatchcybersecurity.com>, IETF SAAG <saag@ietf.org>
Thread-Topic: [art] [saag] Date formats: RFC3339 vs. RFC 5322
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Date: Thu, 15 Apr 2021 10:30:03 +0000
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Subject: Re: [saag] [art] Date formats: RFC3339 vs. RFC 5322
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On 2021-04-14 Phillip Hallam-Baker <ietf@hallambaker.com> wrote:

> Unfortunately, the method of platform handling of UTC means that all date time
> values recorded in electronic documents are inherently ambiguous, a state 
> of affairs that will persist until the cretinous notion of leap seconds is
> done away with.

Leap seconds won't go away unless you change the duration of a second or planet's rotation..

I don’t think UTC or TAI makes a big difference in this draft on security!  But it can make a big difference if assuming 00:00:00 UTC as it can become 23:59:59 (or indeed 23:59:60) on the previous day.

Here's my little developer hint if dealing with dates in unknown timezones and unknown time, needing to be transformed to timestamps for calculations/comparisons:

Assume 10:00 UTC, and then it will at least be the same date in almost all timezones and daylight savings through the year. 

Perhaps to avoid TAI problem we can add 15 minutes to 10:15 UTC, e.g https://everytimezone.com/s/e0c43e02 

-- 
Stian Soiland-Reyes, The University of Manchester
https://www.esciencelab.org.uk/
https://orcid.org/0000-0001-9842-9718
    Please note that I may work flexibly – whilst it suits me to email now, 
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