Przemyslaw Augustyniak <silvathraec@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@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