I'm forwarding this message from Janne Snabb, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. --ado -----Original Message----- From: Janne Snabb [mailto:snabb@epipe.com] Sent: Thursday, July 15, 2010 1:21 To: tz@lecserver.nci.nih.gov Subject: Europe/Finland DST correction for years 1981 and 1982 Hi, I noticed that the Finland data is not accurate for years 1981 and 1982. During these two first trial years the DST adjustment was made one hour earlier than in forthcoming years. Starting 1983 the adjustment was made according to the central European standards. This is documented in Heikki Oja: Aikakirja 2007, published by The Almanac Office of University of Helsinki, ISBN 952-10-3221-9, available online (in Finnish) at: http://almanakka.helsinki.fi/aikakirja/Aikakirja2007kokonaan.pdf Page 105 (56 in PDF version) has a handy table of all past daylight savings transitions. It is easy enough to interpret without Finnish skills. This is also confirmed by Finnish Broadcasting Company's archive at: http://www.yle.fi/elavaarkisto/?s=s&g=1&ag=5&t=&a=3401 The news clip from 1981 says that "the time between 2 and 3 o'clock does not exist tonight". Thus Paul Eggert's comment in the file (above the relevant entry) is indeed correct. Please see the diff at the bottom of this message. I believe that it produces the desired results. I am not a member of this list, so please CC me with any further correspondence. Best Regards, -- Janne Snabb / EPIPE Communications snabb@epipe.com - http://epipe.com/ --- europe.orig 2009-09-09 15:19:43.000000000 +0300 +++ europe 2010-07-15 07:29:53.000000000 +0300 @@ -1023,14 +1023,16 @@ # since 1981. Go with Strang instead. # # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Finland 1942 only - Apr 3 0:00 1:00 S Rule Finland 1942 only - Oct 3 0:00 0 - +Rule Finland 1981 1982 - Mar lastSun 2:00 1:00 S +Rule Finland 1981 1982 - Sep lastSun 3:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/Helsinki 1:39:52 - LMT 1878 May 31 1:39:52 - HMT 1921 May # Helsinki Mean Time - 2:00 Finland EE%sT 1981 Mar 29 2:00 + 2:00 Finland EE%sT 1983 2:00 EU EE%sT # Aaland Is Link Europe/Helsinki Europe/Mariehamn