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the localtime timezone data) is not overwritten until we know the data is good. tzload() is capable of failing after having begun modifying the struct it's pointed at, and in such cases the static data was left in a corrupt state. Bug does not exist pre-8.0 (since we didn't have this code then) nor post-8.0 (since we already changed the code to tzload into local variables initially). Per report from Nick Martens.
This is a PostgreSQL adapted version of the timezone library from: ftp://elsie.nci.nih.gov/pub/tzcode*.tar.gz The data files under data/ are an exact copy of the latest data set from ftp://elsie.nci.nih.gov/pub/tzdata*.tar.gz Since time zone rules change frequently in some parts of the world, we should endeavor to update the data files before each PostgreSQL release.