On Wed, Jun 29, 2016 at 4:05 PM, Random832 <random832@fastmail.com> wrote:

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Note that the result of conversion to UTC is different for t0 and t1 when they are interpreted as NY times, but the same when they are interpreted as London time.

I'm pretty sure you just proved *my* point - that the flag is meaningless outside of the timezone the time was originally created for [or timezones that happen to have an identical fold] - so maybe I didn't explain it clearly in the first place.

It is not meaningless. It is used to detect whether a datetime instance is special in the system timezone.

It seems to go against the concept of a naive time to contain data that is only relevant to some specific timezone.

Yes, there was some resistance to the notion that naive may mean system timezone in some cases. This ship has sailed, though. If you have any specific suggestions for how PEP 495 features can be better explained in the documentation, I would be glad to hear them. If you are unhappy about some aspects of the design, I am afraid you are a year late to make your point.