[issue5207] extend strftime/strptime format for RFC3339 and RFC2822

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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versions: +Python 3.4 -Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5207>
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