[issue33400] logging.Formatter does not default to ISO8601 date format

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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versions: +Python 3.6, Python 3.7, Python 3.8 -Python 3.4

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33400>
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