[tz] [PROPOSED] New zone Asia/Atyrau

[Stepan Golosunov]

07.11.2016 в 09:42:04 -0800 Paul Eggert написал:
> --- a/asia
> +++ b/asia

> @@ -1775,7 +1769,21 @@ Zone	Asia/Qyzylorda	4:21:52 -	LMT	1924 May  2
>  			6:00 RussiaAsia	+06/+07	1992 Mar 29  2:00s
>  			5:00 RussiaAsia	+05/+06	2004 Oct 31  2:00s
>  			6:00	-	+06
> -# Aqtobe (aka Aktobe, formerly Aktyubinsk) (KZ-AKT)
> +# The following zone is like Asia/Qyzylorda except for being one
> +# hour earlier from 1991-09-29 to 1992-03-29.  The 1991/2 rules for
> +# Qostenay are unclear partly because of the 1997 Turgai

typo

> +# reorganization, so this zone is commented out for now.

Turgai reorganization should affect only southern part of Qostanay
oblast.  Which should probably be separated into Asia/Arkalyk zone.
(There were also 1970, 1988 and 1990 Turgai oblast reorganizations
according to wikipedia.)

> +#Zone	Asia/Qostanay	4:14:20 -	LMT	1924 May  2

http://www.ng.kz/gazeta/195/hranit/
suggests that clocks were to be moved 40 minutes backwards on
1920-01-01 to the fourth time belt.  But I do not understand
how that could happen.

> +#			4:00	-	+04	1930 Jun 21
> +#			5:00	-	+05	1981 Apr  1
> +#			5:00	1:00	+06	1981 Oct  1
> +#			6:00	-	+06	1982 Apr  1
> +#			5:00 RussiaAsia	+05/+06	1991 Mar 31  2:00s
> +#			4:00 RussiaAsia	+04/+05	1992 Jan 19  2:00s
> +#			5:00 RussiaAsia	+05/+06	2004 Oct 31  2:00s
> +#			6:00	-	+06
> +#
> +# Aqtöbe (aka Aktobe, formerly Aktyubinsk) (KZ-AKT)


> +# Atyraū (KZ-ATY) is like Mangghystaū except it switched from
> +# +04/+05 to +05/+06 in spring 1999, not fall 1994.
> +Zone	Asia/Atyrau	3:27:44	-	LMT	1924 May  2

How is it determined whether to use Asia/ or Europe/ ?
(This question is also relevant for Asia/Oral.)

> +			4:00	-	+04	1930 Jun 21

1919 decree
(http://www.worldtimezone.com/dst_news/dst_news_russia-1919-02-08.html
and in Byalokoz) lists Ural river (plus 10 versts on its left bank) in
the third time belt (before 1930 this means +03).

http://www.worldtimezone.com/dst_news/dst_news_russia-1956-05-28.html
(implemented on 1957-03-01?) says that 1919 time belt borders became
inconvenient and renders new time belt borders listing Guryev and West
Kazakhstan oblasts in the fourth time belt (which after 1930 means
+05).

(Though at least later such time belt borders often did not reflect
reality due to numerous exceptions.)

Asia/Oral is also affected.

> +			5:00	-	+05	1981 Oct  1
> +			6:00	-	+06	1982 Apr  1

Are there any sources for these suspicious transitions?
(Given that 1981 generally introduced summer time in April and was
supposed to remove exceptions in October, not to add them.)

> +			5:00 RussiaAsia	+05/+06	1991 Mar 31  2:00s
> +			4:00 RussiaAsia	+04/+05	1992 Jan 19  2:00s
> +			5:00 RussiaAsia	+05/+06	1999 Mar 28  2:00s
> +			4:00 RussiaAsia	+04/+05	2004 Oct 31  2:00s
> +			5:00	-	+05