From: Otavio Exel [mailto:oexel@economatica.com.br] Sent: Wednesday, October 10, 2001 8:26 AM
according to the <a href="http://pcdsh01.on.br/HvInic01.htm">Brazilian official page</a> on the subject of DST:
DST start: 2001-10-14T00:00:00 DST end: 2002-02-17T00:00:00
Yes, and I think ftp://elsie.nci.nih.gov/pub/tzdata2001d.tar.gz already reflects this change. I just built and installed the 2001d distribution, ran the shell command "zdump -v America/Sao_Paulo | egrep 'Oct.*2001|Feb.*2002'", and got the following output for time stamps just before and after the two transitions in question: America/Sao_Paulo Sun Oct 14 02:59:59 2001 UTC = Sat Oct 13 23:59:59 2001 BRT isdst=0 America/Sao_Paulo Sun Oct 14 03:00:00 2001 UTC = Sun Oct 14 01:00:00 2001 BRST isdst=1 America/Sao_Paulo Sun Feb 17 01:59:59 2002 UTC = Sat Feb 16 23:59:59 2002 BRST isdst=1 America/Sao_Paulo Sun Feb 17 02:00:00 2002 UTC = Sat Feb 16 23:00:00 2002 BRT isdst=0 This matches the dates and times that you give, so I don't think any change is needed.
-Rule Brazil 2000 max - Oct Sun>=8 0:00 1:00 S -Rule Brazil 2001 max - Feb Sun>=15 0:00 0 -
These rules say "From the 2nd Sunday in October (i.e. the first Sunday on or after the 8th) at 00:00 local time, to the 3rd Sunday in February (i.e. the first Sunday on or after the 15th) at 00:00 local time". These rules are what generated the transitions listed above.