FW: FW: Corrections to historic German timezone information
Paul Eggert
eggert at CS.UCLA.EDU
Tue Feb 5 23:03:19 UTC 2008
> Von: Sebastian Wangnick [mailto:sebastian.nospam01 at wangnick.de]
> Gesendet: Dienstag, 29. Januar 2008 19:18
> However, if you can maintain only one timezone for the state of
> Germany, you should probably use the new definition of
> Europe/Berlin, limiting the error in 1945 to the smaller territory
> and population, but please note that this would be considered
> politically incorrect by said population.
We try to avoid political disputes like that, since that really isn't
what we're interested in and it would be a big time sink for us to
wade into political disputes. What we mostly care about is describing
the clocks accurately for the regions in question.
It seems to me that the political issue here might be addressed better
simply by treating Berlin more like other occupied cities. If you
look at the rules for Paris, you'll see that it switches from "France"
to "C-Eur" rules during German occupation. For Berlin, it would make
sense for it to switch from "C-Eur" to Soviet rules when the Soviets
imposed their own DST rules.
Something like the following change, perhaps? (I haven't checked it
in detail.) The idea is that this won't change the externally-visible
behavior of tz time stamps at all; it'll just change how it's
explained.
--- europe 2007/12/31 15:23:09 2007.11
+++ europe 2008/02/05 23:01:27
@@ -480,9 +480,10 @@ Rule C-Eur 1940 only - Apr 1 2:00s 1:0
Rule C-Eur 1942 only - Nov 2 2:00s 0 -
Rule C-Eur 1943 only - Mar 29 2:00s 1:00 S
Rule C-Eur 1943 only - Oct 4 2:00s 0 -
-Rule C-Eur 1944 only - Apr 3 2:00s 1:00 S
+Rule C-Eur 1944 1945 - Apr Mon>=1 2:00s 1:00 S
# Whitman gives 1944 Oct 7; go with Shanks & Pottenger.
Rule C-Eur 1944 only - Oct 2 2:00s 0 -
+Rule C-Eur 1945 only - Sep 16 2:00 0 -
Rule C-Eur 1977 1980 - Apr Sun>=1 2:00s 1:00 S
Rule C-Eur 1977 only - Sep lastSun 2:00s 0 -
Rule C-Eur 1978 only - Oct 1 2:00s 0 -
@@ -1105,21 +1106,26 @@ Zone Europe/Paris 0:09:21 - LMT 1891 Mar
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule Germany 1945 only - Apr 2 2:00s 1:00 S
-Rule Germany 1945 only - May 24 2:00 2:00 M # Midsummer
-Rule Germany 1945 only - Sep 24 3:00 1:00 S
-Rule Germany 1945 only - Nov 18 2:00s 0 -
Rule Germany 1946 only - Apr 14 2:00s 1:00 S
Rule Germany 1946 only - Oct 7 2:00s 0 -
Rule Germany 1947 1949 - Oct Sun>=1 2:00s 0 -
-Rule Germany 1947 only - Apr 6 2:00s 1:00 S
+# http://www.ptb.de/de/org/4/44/441/salt.htm says the following transition
+# occurred at 3:00 MEZ, not the 2:00 MEZ given in Shanks & Pottenger.
+# Go with the PTB.
+Rule Germany 1947 only - Apr 6 3:00s 1:00 S
Rule Germany 1947 only - May 11 2:00s 2:00 M
Rule Germany 1947 only - Jun 29 3:00 1:00 S
Rule Germany 1948 only - Apr 18 2:00s 1:00 S
Rule Germany 1949 only - Apr 10 2:00s 1:00 S
+
+Rule SovietZone 1945 only - May 24 2:00 2:00 M # Midsummer
+Rule SovietZone 1945 only - Sep 24 3:00 1:00 S
+Rule SovietZone 1945 only - Nov 18 2:00s 0 -
+
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Europe/Berlin 0:53:28 - LMT 1893 Apr
- 1:00 C-Eur CE%sT 1945 Apr 2 2:00
+ 1:00 C-Eur CE%sT 1945 May 24 2:00
+ 1:00 SovietZone CE%sT 1946
1:00 Germany CE%sT 1980
1:00 EU CE%sT
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