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Reads and parses a time zone information file (in tzfile(5) aka. Olson file format) and returns the corresponding TZ data structure.

Looks for the time zone file in the system timezone directory, which is /usr/share/zoneinfo, or if the TZDIR environment variable is set, then there.

Returns the local TZ based on the TZ and TZDIR environment variables.

See tzset(3) for details, but basically:

• If TZ environment variable is unset, we loadTZFromFile "/etc/localtime".
• If TZ is set, but empty, we loadSystemTZ "UTC".
• Otherwise, we just loadSystemTZ it.

Note, this means we don't support POSIX-style TZ variables (like "EST5EDT"), only those that are explicitly present in the time zone database.

Reads the corresponding file from the time zone database shipped with this package.