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<p><font face="monospace">Currently the zone Europe/Kaliningrad has</font></p>
<p><font face="monospace">Zone Europe/Kaliningrad 1:22:00 -
LMT 1893 Apr<br>
1:00 C-Eur CE%sT 1945 Apr 10<br>
<font color="#ff2600">2:00 Poland
EE%sT 1946 Apr 7</font><br>
3:00 Russia MSK/MSD 1989 Mar 26
2:00s<br>
2:00 Russia EE%sT 2011 Mar 27
2:00s<br>
3:00 - +03 2014 Oct 26
2:00s<br>
2:00 - EET</font></p>
<p><font face="monospace">I wonder on which source this line is
based:<br>
2:00 Poland EE%sT 1946 Apr 7</font></p>
<p><font face="monospace">It implies these time changes:<br>
29 April 1945 from 2:00 to 3:00 like Poland DST<br>
1 November 1945 from 3:00 back to 2:00</font></p>
<p><font face="monospace">Russia took control of
Königsberg/Kaliningrad in East Prussia on 10 April 1045.</font></p>
<p><font face="monospace">As a general rule, Russia imposed timezone
2:00 on occupied German territory in 1945, <br>
which is the same as German DST already in force from 2 April
1945.</font></p>
<p><font face="monospace">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<br>
and then back to 1:00 (CET) on 18 Nov 1945.</font></p>
<p><font face="monospace">Now what happened in Königsberg?<br>
</font></p>
<p><font face="monospace">The Potsdam agreement of 2 August 1945 :
(quote from Wikipedia)<br>
</font></p>
<p>
<blockquote type="cite"><font face="monospace">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.</font></blockquote>
</p>
<p><font face="monospace">Russia annexed the area on 17 October
1945, and integrated into the republic of Russia on 7 April
1946.</font></p>
<p><font face="monospace">Poland had no role to play in this matter.<br>
</font></p>
<p><font face="monospace">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.<br>
It was already annexed.<br>
It remained at 2:00 until 7 April 1946, when it was integrated
and went to Moscow time.</font></p>
<p><font face="monospace">This transition on 7 April 1946 is also
found in Shanks.<br>
Shanks does not have the double DST from 24 May to 24 September
1945, but I think he is wrong there.<br>
Why should the Russians have treated East Prussia from the rest
of the occupied German territory in May 1945.<br>
<br>
</font></p>
<p><font face="monospace">That would make the zone table like this (
I marked the difference in red)</font><br>
<font face="monospace">Zone Europe/Russia/Kaliningrad 1:22:00
- LMT 1893 Apr<br>
1:00 C-Eur CE%sT 1945 Apr 10<br>
<font color="#ff2600">1:00 1:00
CEST 1945 May 24 2:00<br>
1:00 2:00 CEMT 1945 Sep 24
3:00<br>
1:00 1:00 CEST 1945 Oct 17 <br>
2:00 - EET 1946 Apr 7</font><br>
3:00 Russia MSK/MSD 1989 Mar 26
2:00s<br>
2:00 Russia EE%sT 2011 Mar 27
2:00s<br>
3:00 - +03 2014 Oct 26
2:00s<br>
2:00 - EET<br>
</font><br>
</p>
<p><font face="monospace">I have tried to simplify</font></p>
<p><font face="monospace">Zone Europe/Russia/Kaliningrad 1:22:00
- LMT 1893 Apr<br>
1:00 C-Eur CE%sT 1945 Apr 10<br>
1:00 SovietZone CE%sT 1945 Oct 17<br>
2:00 - EET 1946 Apr 7<br>
3:00 Russia MSK/MSD 1989 Mar 26
2:00s<br>
2:00 Russia EE%sT 2011 Mar 27
2:00s<br>
3:00 - +03 2014 Oct 26
2:00s<br>
2:00 - EET</font></p>
<p><font face="monospace">but get an error: can't determine time
zone abbreviation to use just after until time<br>
at this line in tzdata.zi</font></p>
<p><font face="monospace">1 So CE%sT 1945 O 17</font></p>
<p><font face="monospace">This is why I made the changes implied by
rule SovietZone explicit</font><br>
</p>
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