[tz] Europe/Volgograd timezone patch

[Paul Eggert]

Денис Савин wrote:

> According to
> http://ru.wikipedia.org/wiki/%D0%A7%D0%B0%D1%81%D0%BE%D0%B2%D1%8B%D0%B5_%D0%BF%D0%BE%D1%8F%D1%81%D0%B0_%D0%A0%D0%BE%D1%81%D1%81%D0%B8%D0%B8
> 
> Zone Europe/Volgograd 2:57:40 - LMT 1920 Jan  3
>  3:00 - TSAT 1925 Apr  6 # Tsaritsyn Time
>  3:00 - STAT 1930 Jun 21 # Stalingrad Time
>  4:00 - STAT 1961 Nov 11
>  4:00 Russia VOL%sT 1989 Mar 26 2:00s # Volgograd T
>  3:00 Russia VOL%sT 1991 Mar 31 2:00s
>  3:00 - VOLT 1991 Sep 29 3:00s
>  2:00 - VOLT 1992 Jan 19 2:00s
>  3:00 Russia VOL%sT 1992 Mar 29 23:00s
>  3:00 Russia VOL%sT 2011 Mar 27 2:00s
>  4:00 - VOLT

Thanks for the heads-up.  As I understand it, this would cause
the following change to zdump output for Europe/Volgograd:

-Sat Mar 30 22:59:59 1991 UT = Sun Mar 31 01:59:59 1991 VOLT isdst=0
-Sat Mar 30 23:00:00 1991 UT = Sun Mar 31 03:00:00 1991 VOLT isdst=0
-Sat Mar 28 21:59:59 1992 UT = Sun Mar 29 01:59:59 1992 VOLT isdst=0
-Sat Mar 28 22:00:00 1992 UT = Sun Mar 29 02:00:00 1992 VOLST isdst=1
+Sat Sep 28 23:59:59 1991 UT = Sun Sep 29 02:59:59 1991 VOLT isdst=0
+Sun Sep 29 00:00:00 1991 UT = Sun Sep 29 02:00:00 1991 VOLT isdst=0
+Sat Jan 18 23:59:59 1992 UT = Sun Jan 19 01:59:59 1992 VOLT isdst=0
+Sun Jan 19 00:00:00 1992 UT = Sun Jan 19 03:00:00 1992 VOLT isdst=0
+Sat Mar 28 19:59:59 1992 UT = Sat Mar 28 22:59:59 1992 VOLT isdst=0
+Sat Mar 28 20:00:00 1992 UT = Sun Mar 29 00:00:00 1992 VOLST isdst=1

I looked at
http://ru.wikipedia.org/wiki/%D0%A7%D0%B0%D1%81%D0%BE%D0%B2%D1%8B%D0%B5_%D0%BF%D0%BE%D1%8F%D1%81%D0%B0_%D0%A0%D0%BE%D1%81%D1%81%D0%B8%D0%B8
but could not see what part of it would imply this change.
Also, Wikipedia sometimes has reliability problems,
since anybody can edit it, so it'd be better to consult
the sources that Wikipedia cites, rather than to rely on
Wikipedia itself.  Can you please help with this?  Unfortunately
I only very poorly read Russian.  Thanks.