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I spent some time getting the two include files merged
together, only to discover that Py_BUILD_CORE is __NOT__
defined when building modules, only when building stuff
linked directly into the core interpreter. Perhaps this
ought to be defined when building the modules with setup.py?
At any rate, I cannot proceed along the route suggested
without this problem being resolved.

On the DateFromTicks(), TimestampFromTicks(),
TimeFromTicks() issue, I'm not sure that there is much
benefit to including a C API for this since if the datetime
module becomes the standard method for managing datetime
objects, there is no point in having the DB API modules
provide something that the datetime module already provides,
right? During the transition period the few lines of code
needed can be posted. If you disagree I can certainly
provide the few lines as part of the patch but I suspect you
will find resistance to having this included by Tim Peters,
the maintainer (I believe) of the datetime module. Feel free
to correct me... :-)