There are different time zones valid in Brazil:
> UTC-3 > UTC-3 and daylight saving time = BRAZIL / BRZLEA
> UTC-4 >
UTC-4 and daylight saving time = BRZLWE
We recommend os, sap system and user timezone to be the same. Check note.
1394857 Regular daylight saving time in Brazil as of 2010
There is a fixed summer time rule defined for 2104 because in 2014 the end of daylight saving time is not on the 3rd Sunday of Feburary, but on the 4th Sunday of Feburary (22.02.2015). In 2015 and 2016 there is no such exception in place and the daylight saving time starts at 18th of Octorber 2015, ends at 21st of Feburary 2016, which matche the existing Variable Summer Time Rule. Therefore no new fixed summer time rule is needed. The regular Variable Summer Time Rule applies. So you needn't to do any changes in STZBC.