[issue23494] adding timedelta to datetime object is not timezone aware

[Akira Li]

Akira Li added the comment:

pytz explicitly documents this case (crossing DST boundary). There is 
tz.normalize() method.

> the tzinfo object is responsible for handling daylight savings time.  This looks like a bug in pytz.

Are any of tzinfo methods even called during `before + timedelta(days=2)`?

Also a DST transition is not the only reason the utc offset or tzname may 
change.

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nosy: +akira

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<http://bugs.python.org/issue23494>
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