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List:       fedora-test-list
Subject:    Re: system-config-date?
From:       Robert Moskowitz <rgm () htt-consult ! com>
Date:       2018-08-24 19:44:29
Message-ID: 137317ee-48b2-a352-be27-8aa2452eb778 () htt-consult ! com
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On 08/24/2018 01:34 PM, Adam Williamson wrote:
> On Fri, 2018-08-24 at 12:00 -0400, Robert Moskowitz wrote:
> > You have to know the format of the zoneinfo directory for this to work.
> > Like start with Am to get American cities.  Not start with H for
> > Helsinki; all you get is Hongkong and HST.
> > 
> > And you have to know a city in the list near where you are.  Many times
> > my city is not included.  Well we 'know' that San Diego and San
> > Francisco are in the same zone as Los_Angeles.  But this is all stuff
> > you have to figure out for yourself when the list comes up. s-c-d is
> > very good at showing you a city near where you are looking for...
> > 
> > Mostly it works.  There have been a few times I have been challenged and
> > had to look at my phone to confirm the timezone.  Just a few. ;)
> The zoneinfo/tzdata database is not formatted for human use. The way it
> was explained to me one time, the basic principle is that an entry is
> added to it any time some kind of new timezone definition or DST
> variation or something happens, associated with the largest or most
> prominent city related to that event, and these entries are never
> removed (so the database acts as a record of *historical* as well as
> *current* timezone variations).
> 
> This is basically why it has such an apparently-quixotic set of cities
> in it, and explains a lot of the "why X but not Y?" questions -
> basically because X at *some* point did something which was not yet
> recorded in the zoneinfo database, but Y never did.
> 
> IMBW, that's just my memory of how it was explained to me. But
> basically, it's *not* a big list of Cities You Might Possibly Know
> About and the timezones they're currently in, but it looks sufficiently
> *like* one that GUI apps often just take its city list and let you
> search it, or something like that.
> 
> AIUI again, the way GNOME does it better is using libgweather:
> 
> https://gitlab.gnome.org/GNOME/libgweather
> 
> which has a gigantic database mapping cities (and other 'locations',
> like airports and stuff) to tzdata timezones. That's why you can look
> up just about anywhere in GNOME and find the time there, or set your
> time for that place:
> 
> https://gitlab.gnome.org/GNOME/libgweather/tree/master/data
> 
> I don't know how heavy libgweather's deps are, but it'd probably be a
> good idea for KDE and Xfce to consider using it to do something similar
> to GNOME, or perhaps for the data to be split out if libgweather's deps
> are inappropriately heavy just for this purpose...
Which is probably why Menominee, MI is in from back when the Michigan 
Upper Peninsula was split between Eastern and Central. Menominee is west 
of Gary Indiana and it was pretty bad up there during double daylight 
days.  I remember the news, including the children hit by cars in the 
dark on their way to school.

Anyway, Adam, thanks for the historical reference.  I have forwarded 
this missive to the Xfce list and see what comes of it.  At times I 
think about where I left coding and what I might be contributing today 
if I did code.  Never learned C; only exposed to B on Honeywells.  Lots 
of years ago.

Back to my testing of EDDSA certs.

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