Tim Peters added the comment:

I expect Peter is correct:  the C fromutc() doesn't match the logic of the 
Python fromutc(), and there are no comments explaining why the C version 
changed the logic.

The last 4 lines of his `time_issues.py` show the difference.  The simplified 
UKSummerTime tzinfo always says the total UTC offset and the DST offset are 
+1:00:00.  The Python .fromutc() adds that hour to the datetime passed in, but 
the C .fromutc() does not.  That's because they implement different functions, 
not because Peter is using .fromutc() ;-)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23600>
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