[issue13305] datetime.strftime("%Y") not consistent for years < 1000

[Paul Ganssle]

Change by Paul Ganssle <p.ganssle at gmail.com>:


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versions: +Python 3.7, Python 3.8, Python 3.9 -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue13305>
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