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Thanks for the clarification. I had forgotten about the
macros -- I'd suggest that you document them in the
datetimeapi.h include file to not cause the same confusion
on the developer side (the trick to achieve adoption is to
make things easy on the developer).

As for TimeFromTicks(): 
This should be rather straight forward to implement: you
take the time part of the ticks timestamp and create a time
object from it. This is the way the DB API constructor works.

Could you add C APIs for the three DB API ticks interface
methods ?

Other things that are missing:
* documentation of the way the CAPI object can be used in
datetimeapi.h
* documentation of the various CAPI entries
* documentation of the API magic number (there should be
some scheme for this)

I think that datetimeapi.h should be enough for a developer
to read in order to use the interface.