DST rules for Poland: corrections for 1946-1949 and 1988-1998

[Paul Eggert]

Przemyslaw Augustyniak <silvathraec at rpg.pl> writes:

> Tzdata 2005i has two minor inaccuracies in historical DST rules for
> Poland:
>
>  * 1946-1949 DST transition dates are partially incorrect, see patch
>    below.
>
>  * Poland reintroduced DST in 1977, together with European Economic
>    Community, but with DST transitions 1h behind EC ones. This difference
>    is incorrectly listed as being dropped only as late as in 1999, rather
>    than in 1988.


Thanks very much for tracking this information down and listing your
sources.  I'll include this info in my next proposed patch to the tz
data.


> Sources:
>
>  * Kazimierz M. Borkowski, "Wszystko o czasie"
>    <http://www.astro.uni.torun.pl/~kb/Artykuly/U-PA/Czas2.htm#tth_tAb1>
>
>  * Druk nr 2180 - o czasie urzędowym na obszarze Rzeczypospolitej Polskiej
>    <http://www.senat.gov.pl/k5/dok/sejm/053/2180.pdf>
>
>  * Uchwała nr 29 Rady Ministrów z dnia 7 marca 1995 r. w sprawie
>    wprowadzenia czasu letniego i zimowego w 1995 r.
>    [M.P. 1995 nr 13 poz. 162]
>    <http://www.abc.com.pl/serwis/mp/1995/0162.htm>
>
>
> You are welcome to contact me if you have any questions. I'm not on the
> list, so please CC me when replying.
>
>                                         Przemysław Augustyniak
>
>
> --- europe.2005i	2005-04-21 21:04:15.000000000 +0200
> +++ europe	2005-05-28 13:32:51.555884081 +0200
> @@ -1686,19 +1686,23 @@
>  # For 1944-1948 Whitman gives the previous day; go with Shanks.
>  Rule	Poland	1945	only	-	Apr	29	0:00	1:00	S
>  Rule	Poland	1945	only	-	Nov	 1	0:00	0	-
> -Rule	Poland	1946	only	-	Apr	14	0:00	1:00	S
> -Rule	Poland	1946	only	-	Sep	 7	0:00	0	-
> -Rule	Poland	1947	only	-	May	 4	0:00	1:00	S
> -Rule	Poland	1947	1948	-	Oct	Sun>=1	0:00	0	-
> -Rule	Poland	1948	only	-	Apr	18	0:00	1:00	S
> -# Whitman also gives 1949 Apr 9 - 1949 Oct 1; go with Shanks.
> +# dr Kazimierz M. Borkowski
> +# Torun Centre for Astronomy of Nicolaus Copernicus University
> +# Department of Radio Astronomy
> +# <http://www.astro.uni.torun.pl/~kb/Artykuly/U-PA/Czas2.htm#tth_tAb1>
> +Rule	Poland	1946	only	-	Apr	14	0:00s	1:00	S
> +Rule	Poland	1946	only	-	Oct	 7	2:00s	0	-
> +Rule	Poland	1947	only	-	May	 4	2:00s	1:00	S
> +Rule	Poland	1947	1949	-	Oct	Sun>=1	2:00s	0	-
> +Rule	Poland	1948	only	-	Apr	18	2:00s	1:00	S
> +Rule	Poland	1949	only	-	Apr	10	2:00s	1:00	S
>  Rule	Poland	1957	only	-	Jun	 2	1:00s	1:00	S
>  Rule	Poland	1957	1958	-	Sep	lastSun	1:00s	0	-
>  Rule	Poland	1958	only	-	Mar	30	1:00s	1:00	S
>  Rule	Poland	1959	only	-	May	31	1:00s	1:00	S
>  Rule	Poland	1959	1961	-	Oct	Sun>=1	1:00s	0	-
>  Rule	Poland	1960	only	-	Apr	 3	1:00s	1:00	S
> -Rule	Poland	1961	1964	-	May	Sun>=25	1:00s	1:00	S
> +Rule	Poland	1961	1964	-	May	lastSun	1:00s	1:00	S
>  Rule	Poland	1962	1964	-	Sep	lastSun	1:00s	0	-
>  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
>  Zone	Europe/Warsaw	1:24:00 -	LMT	1880
> @@ -1707,24 +1711,8 @@
>  			2:00	Poland	EE%sT	1922 Jun
>  			1:00	Poland	CE%sT	1940 Jun 23 2:00
>  			1:00	C-Eur	CE%sT	1944 Oct
> -			1:00	Poland	CE%sT	1977 Apr  3 1:00
> -			1:00	W-Eur	CE%sT	1999
> -# IATA SSIM (1991/1996) gives EU rules, but the _The Warsaw Voice_
> -# <a href="http://www.warsawvoice.com.pl/v361/NewsInBrief.shtml">
> -# http://www.warsawvoice.com/pl/v361/NewsInBrief.shtml (1995-09-24)
> -# </a>
> -# says the autumn 1995 switch was at 02:00.
> -# Stick with W-Eur for now.
> -#
> -# From Marcin.Kasperski at softax.com.pl (1999-06-10):
> -# According to my colleagues someone recently decided, that Poland would
> -# follow European Union regulations, so - I think - the matter is not
> -# worth further discussion.
> -#
> -# From Paul Eggert (1999-06-10):
> -# Kasperski also writes that the government futzed with the rules in 1997
> -# or 1998 but he doesn't remember the details.  Assume they switched to
> -# EU rules in 1999.
> +			1:00	Poland	CE%sT	1977
> +			1:00	W-Eur	CE%sT	1988
>  			1:00	EU	CE%sT
>  # Portugal