Patch version 18:
 - Fix a loss of precision in _PyTime_SetDenominator()
 - Add more tests on integer overflow

I also updated the patch adding datetime.datetime support because some people are interested by the type, even I don't think that it is interesting to add it. datetime.datetime is only usable with time.time(), os.*stat() and time.clock_gettime(), whereas it is incompatible with all other functions.