On Sun, Sep 30, 2012 at 11:28 PM, Serhiy Storchaka <storchaka at gmail.com>wrote: > Why not use the system data which are updated by the OS? I know that > Windows also changes the clock for local DST. > The Windows timezone information does not include any historical information, as it's designed primarily to keep your computers clock correctly, not to convert date times between different timezones. As a result using to to convert data in the past can give incorrect information. We therefore want to consistently use the tz database. //Lennart -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20120930/9c19fe2b/attachment.html>