"Dave O'Callaghan" <daveoc@uk.ibm.com> writes:
I have been alerted to this website http://icu-project.org/trac/ticket/5470 which describes an issue with the Brazil update in tzdata2006n.
Is this true?
It appears to me to be a problem in the ICU4C's code simpletz.cpp, not in the tz code or data itself, so you should ask whoever wrote simpletz.cpp to fix it. The tz data currently says that the fall-back transition in Brazil in 2009 is the last Sunday in February, which will be 2009-02-22, but the ICU4C (?) code apparently does not handle this case correctly. To some extent this is all academic. Judging by past experience, Brazil most likely will change the rules before 2009 rolls around, so the tz data is just guessing about the 2009 transition.