Re: [art] New Version Notification for draft-touch-time-05.txt

Joe Touch <touch@strayalpha.com> Tue, 12 November 2019 14:34 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Tue, 12 Nov 2019 06:33:59 -0800
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To: Tony Finch <dot@dotat.at>
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Subject: Re: [art] New Version Notification for draft-touch-time-05.txt
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> On Nov 12, 2019, at 5:37 AM, Tony Finch <dot@dotat.at> wrote:
> 
> Joe Touch <touch@strayalpha.com> wrote:
> 
>>>>> Lamport clocks and vector clocks don't use time, but the section heading
>>>>> implies that they do.
>>>> 
>>>> It depends on how you interpret 'time'.
>>> 
>>> I meant in the usual sense, as implied by the draft's terminology section.
>> 
>> They’re a bit like Schrodinger’s cat - they jump only whey you look at
>> them (or would need to). IMO, they are time scales for that reason.
> 
> Perhaps the terminology section should make it clear that your definition
> of time is extended in this way.

Will do.

> 
>>> The problem with that paragraph is it sets up a false dichotomy. Unix time
>>> does not intend to track solar time nor SI seconds, it tracks civil time,
>>> which is a different third option. Leaving that option out is misleading.
>> 
>> The dichotomy is accurate - either time units are a physical constant or
>> they’re defined relative to celestial events.
> 
> Except for Lamport clocks or vector clocks. And civil time is not
> either/or wrt physical constants and celestial events, it's a mashup of
> both.

Agree with your point about Lamport and vector clocks, but they’re never presented as measuring the passage of time. Unix is. And civil time isn’t a time scale in of itself - it’s a designation of a time scale or combination of time scales. I can add that.

Note that this is down in the weeds of what this document is trying to accomplish. It isn’t intended to be THE definitive document about ways to keep time. It’s about *picking* a time scale and not trying to create your own.

Joe