[docs] "sane" tzinfo subclasses

[Senthil Kumaran]

On Sun, Sep 18, 2011 at 09:04:16PM -0400, Paul Koning wrote:
> Gentlepeople,
> 
> Section 8.1.6 of the library manual talks about
> utcoffset(dt)-dst(dt) as the "standard offset" and says that this
> should not depend on the date or time but only on the location.

What would be good note to add to explain that? IIRC, someone at the
top when dealing with datetime and timezones Python docs already
mentions that it cannot be relied up completely, because timezone
rules changes sometimes due to politics of the land.

-- 
Senthil