Ned Deily <n...@python.org> added the comment:

The behavior you see with a Python 3.7 is not universal. For example, on macOS:

Python 3.7.9 (v3.7.9:13c94747c7, Aug 15 2020, 01:31:08)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import datetime
>>> datetime.datetime.strptime("0020-10-05", "%Y-%m-%d").strftime("%Y-%m-%d")
'0020-10-05'

So there is apparently something different in the environments between the 
Python 3.6 and 3.7 you are using, rather than an issue in Python itself. 
Perhaps a comparison of the outputs between:

python3.6 -m test.pythoninfo
python3.7 -m test.pythoninfo

will suggest something. In any case, as Josh notes, Python 3.7 is in the 
security-fix-only phase of its life cycle so even if there were an issue in 
Python itself it would likely not meet the criteria to be fixed in 3.7.

----------
nosy: +ned.deily
resolution:  -> works for me
status: open -> pending

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41702>
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