Alexander Belopolsky added the comment:

> For any valid string, strptime followed by strftime should return
> the same string.

Not necessarily.  String to datetime mapping implemented by strptime can be 
many to one.  For example,

>>> datetime.strptime("2014 366", "%Y %j") == datetime.strptime("2015 1", "%Y 
>>> %j")
True

in this case, strptime-strftime may not round-trip.

>>> datetime.strptime("2014 366", "%Y %j").strftime("%Y %j")
'2015 001'

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23136>
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