Nothing
See this Stackoverflow question for problems with this csv file, and the following quote
Why don't you use Boost.DateTime time zone support?
Boost.DateTime's time zone support is broken. Time zones can not be represented with a simple table of rules where daylight saving depend only on certain n'th day of week in month. The daylight savings time may vary by year, political issues and many other things.
attributed to the Boost locale documentation.
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