[issue23332] datetime.isoformat() -> explicitly mark UTC string as such

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

What is your specific proposal?

As I explained, we cannot assume that naive timezone instances are in UTC because while sometimes they are (as in datetime.utcnow()), more often they are not (as in datetime.now()).  So changing dt.isoformat() when dt is naive is wrong.

Another alternative would be to return aware instances from utcnow(), but that would break a lot of code.

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<http://bugs.python.org/issue23332>
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