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The entire public interface documented for the datetime C API is various C macros (see: https://docs.python.org/3/c-api/datetime.html) which are wrappers around function calls to the PyDateTimeAPI / PyDatetime_CAPI struct, but the struct itself is undocumented.
Unfortunately (or fortunately, depending on how you think the C API should look), pretty much everyone has to know the implementation details of the C API struct anyway. Bindings in other languages usually can't use the C preprocessor macros and have to directly use the C API struct so projects like PyPy, PyO3 and Cython are using it. The struct also can do things that the macros can't do: consider bug bpo-30155 which is looking for a way to create a datetime object with a tzinfo (which is possible using the C struct).
I think we can should go ahead and make the PyDateTimeAPI struct "public" and document the functions on it. This may be a bit tougher than one would hope because the overlap between the macros and the struct functions isn't 100%, but it's pretty close, so I would think we'd want to document the two ways to do things rather close to one another.
nosy-ing Victor on here in case he has any strong opinions about whether these kinds of struct should be exposed as part of the official public interface.
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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