[issue36833] Add tests for Datetime C API Macros

[Joannah Nanjekye]

Change by Joannah Nanjekye <nanjekyejoannah at gmail.com>:


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nosy: +nanjekyejoannah
versions: +Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36833>
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