On Sun, Sep 30, 2012 at 11:28 PM, Serhiy Storchaka <storch...@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
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