FW: Daylight Savings Time problems in Brazil

[Olson, Arthur David (NCI)]

Hank Ivy is not on the time zone mailing list; direct replies appropriately.
 
                --ado
 
-----Original Message-----
From: Hank Ivy [mailto:hivy at rosemail.rose.hp.com]
Sent: Wednesday, February 28, 2001 2:12 PM
To: tz at elsie.nci.nih.gov
Subject: Daylight Savings Time problems in Brazil


Dear Sirs, 

I have been working with the 2000h version of the time zone and daylight 
savings time data at 
ftp://elsie.nci.nih.gov/pub/tzdata2000h.tar.gz
<ftp://elsie.nci.nih.gov/pub/tzdata2000h.tar.gz>  , and 
ftp://elsie.nci.nih.gov/pub/tzcode2000h.tar.gz
<ftp://elsie.nci.nih.gov/pub/tzcode2000h.tar.gz>  . 


I have found some unusual results in the rules files for time zones 
in Brazil.  I have given a high level statement of the unusual, and 
then detailed output from the zdump command later. 
The details are in the attachment. 


Do you get similiar results from the zdump command? 
Have I made a mistake in understanding the zdump results? 
Is there any way that I can help clear this up? 


***  Local Name BRT 3 BRST in Brazil
The time zone America/Recife has a seven day long Daylight 
Savings Time (DST) in October 2000, and no DST in 1991-1998, 2001, 
and beyond.

The time zone America/Maceio has a fourteen day long DST
in October 2000, and no DST in 1991-1994, 1997, 1998, 2001, 
and beyond.

The time zone America/Fortaleza has a fourteen day long (DST)
in October 2000, and no DST in 1991-1998, 2001, and beyond.

The time zones America/Araguaina and America/Sao_Paulo have 
the same local names as the three time zones above.  They are all 
in Brazil.  These time zones have reasonable length DST in 2000, 
and 2001.  These look OK. 


***  Local Name AMT 4 AMST in Brazil
The time zone America/Boa_Vista has a seven day long  (DST)
in October 2000, and no DST in 1988-1998, 2001, and beyond.

The time zone America/Cuiaba has the same local name.  They 
are both in Brazil.  This time zone has reasonable length 
DST in 2000, and 2001.  This looks OK.



-- 



Regards, Hank Ivy



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