[tz] some problems with tzdata for Simferopol

[Paul Eggert]

On 4/15/22 05:30, Michael H Deckers via tz wrote:

>        The comment says that Simferopol uses Moscow time since 1994 May, 
> but
>        the Zone line
>               "3:00   E-Eur   MSK/MSD 1996 Mar 31  0:00s"
>        contradicts it (Moscow had other switching times between summer
>        and winter times). Which is correct?

Thanks, this appears to be a transcription error. The rules should say 
C-Eur instead of E-Eur. Fixed in the attached patches.

> 
>     •  It is not clear what "IATA SSIM (1994/1997)" actually says. They
>        probably do not specify the switching times expressed with
>        the Zone line
>               "3:00   E-Eur   MSK/MSD 1996 Mar 31  0:00s"
>        or do they?

IATA uses its own format. I do not have access to their data; instead, I 
formerly got summaries of their changes from the late Gwillim Law. You 
can see how I incorporated those changes by looking at these old emails:

https://mm.icann.org/pipermail/tz/1996-November/009710.html
https://mm.icann.org/pipermail/tz/1998-September/010276.html
https://mm.icann.org/pipermail/tz/2000-July/010990.html

and you can see an example of an email from Gwillim Law here:

https://mm.icann.org/pipermail/tz/1997-March/009863.html

> 
>     •  The Zone line
>               "3:00   Russia  MSK/MSD 1997"
>        is redundant.

Thanks.

Proposed patches attached and installed into the development repository.
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