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This API is seriously broken. datetime.h says 
static PyDateTime_CAPI *PyDateTimeAPI;

which means that including this file from two C (or C++) 
files leads to two independent PyDateTimeAPI symbols - 
calling PyDateTime_IMPORT in one file still leaves 
PyDateTimeAPI being 0 in the other!

I double checked, and this happens with both C and C++.

This needs to be revised so that there is indeed only one 
PyDateTimeAPI symbol, no matter how many files include that 
file. s/static/extern/ and defining "PyDateTime_CAPI 
*PyDateTimeAPI;" in one of the c files in python.