For Omsk Time (MSK+3) there is an additional issue with the two Altais. http://en.wikipedia.org/wiki/Omsk_Time gives 1993-05-23 Novosibirsk Oblast - Asia/Novosibirsk 1995-05-28 Altai Krai and Altai Republic - Asia/Omsk 2002-05-01 Tomsk Oblast - Asia/Novosibirsk 2010-03-28 Kemerovo Oblast - Asia/Novokuznetsk with broken sources. If the Altais joined independent from the others that would mean creating Asia/Barnaul as I did suggest 2011-09-17 http://thread.gmane.org/gmane.comp.time.tz/4011 The current tzdata has discontinuous zones because the Altais are included with Omsk, while Novosibirsk which lies between Omsk and the Altais is given as having joined Omsk later. Maybe people who can write Russian easily can do some googling for time changes in the two Altais, in Tomsk and in Novosibirsk, especially when did they join Omsk Time and provide the sources here. t -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin Germany http://tobiasconradi.com/tobias_conradi