Well, Unix computers come with their own list, often in somewhere like
/usr/lib/zoneinfo. This says the dates on which the change to summer time
should occur for each timezone. I don't know how other OS's do it though.

-- 
Stephen Turner    [EMAIL PROTECTED]    http://www.statslab.cam.ac.uk/~sret1/
  Statistical Laboratory, 16 Mill Lane, Cambridge CB2 1SB, England
  "Ad infinitum, if not ad nauseam." (Interviewee, BBC Radio 4)

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