[tz] proposed change to Europe/Kaliningrad in 1945

[Alois Treindl]

Currently the zone Europe/Kaliningrad has

Zone Europe/Kaliningrad  1:22:00 - LMT     1893 Apr
                          1:00   C-Eur   CE%sT   1945 Apr 10
2:00   Poland EE%sT   1946 Apr  7
                          3:00   Russia  MSK/MSD 1989 Mar 26 2:00s
                          2:00   Russia  EE%sT   2011 Mar 27 2:00s
                          3:00   -       +03     2014 Oct 26 2:00s
                          2:00   -       EET

I wonder on which source this line is based:
                          2:00   Poland  EE%sT   1946 Apr  7

It implies these time changes:
29 April 1945 from 2:00 to 3:00 like Poland DST
1 November 1945 from 3:00 back to 2:00

Russia took control of Königsberg/Kaliningrad in East Prussia on 10 
April 1045.

As a general rule, Russia imposed timezone 2:00 on occupied German 
territory in 1945,
which is the same as German DST already in force from 2 April 1945.

On 24 May 1945 Russia imposed double DST, making the effective time 3:00 
east, until 24 Sept 1945, when it went back to 2:00
and then back to 1:00 (CET) on 18 Nov 1945.

Now what happened in Königsberg?

The Potsdam agreement of 2 August 1945 : (quote from Wikipedia)

> The Conference has agreed in principle to the proposal of the Soviet 
> Government concerning the ultimate transfer to the Soviet Union of the 
> City of Koenigsberg and the area adjacent to it as described above 
> subject to expert examination of the actual frontier.

Russia annexed the area on 17 October 1945, and integrated into the 
republic of Russia on 7 April 1946.

Poland had no role to play in this matter.

Regarding time regime, I would assume that the transition from 2:00 to 
1:00 of 18 Nov 1945, for occupied Germany, did not happen in Kaliningrad.
It was already annexed.
It remained at 2:00 until 7 April 1946, when it was integrated and went 
to Moscow time.

This transition on 7 April 1946 is also found in Shanks.
Shanks does not have the double DST from 24 May to 24 September 1945, 
but I think he is wrong there.
Why should the Russians have treated East Prussia from the rest of the 
occupied German territory in May 1945.

That would make the zone table like this ( I marked the difference in red)
Zone Europe/Russia/Kaliningrad   1:22:00 -      LMT     1893 Apr
                          1:00   C-Eur   CE%sT   1945 Apr 10
1:00   1:00 CEST    1945 May 24 2:00
                          1:00   2:00    CEMT    1945 Sep 24 3:00
                          1:00   1:00    CEST    1945 Oct 17
                          2:00   -       EET     1946 Apr 7
                          3:00   Russia  MSK/MSD 1989 Mar 26 2:00s
                          2:00   Russia  EE%sT   2011 Mar 27 2:00s
                          3:00   -       +03     2014 Oct 26 2:00s
                          2:00   -       EET

I have tried to simplify

Zone Europe/Russia/Kaliningrad   1:22:00 -      LMT     1893 Apr
                          1:00   C-Eur   CE%sT   1945 Apr 10
                          1:00  SovietZone CE%sT 1945 Oct 17
                          2:00   -       EET     1946 Apr 7
                          3:00   Russia  MSK/MSD 1989 Mar 26 2:00s
                          2:00   Russia  EE%sT   2011 Mar 27 2:00s
                          3:00   -       +03     2014 Oct 26 2:00s
                          2:00   -       EET

but get an error: can't determine time zone abbreviation to use just 
after until time
at this line in tzdata.zi

1 So CE%sT 1945 O 17

This is why I made the changes implied by rule SovietZone explicit
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mm.icann.org/pipermail/tz/attachments/20220221/8ecaa5e2/attachment.html>