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And now, something completly different.
nanosec-wip.patch is a work-in-progress patch to use a unified (64 bits) integer type to store a timestamp: _PyTime_t. The type is written to be opaque, the unit is undefined, you must use functions to convert from and to this type. Well, in fact it's just a number of nanoseconds.
The patch is large:
 Include/pytime.h | 125 ++++++-----
 Modules/_datetimemodule.c | 43 ++--
 Modules/_testcapimodule.c | 25 +-
 Modules/_threadmodule.c | 156 +++++++-------
 Modules/gcmodule.c | 12 -
 Modules/posixmodule.c | 29 +-
 Modules/selectmodule.c | 33 ---
 Modules/signalmodule.c | 20 -
 Modules/socketmodule.c | 151 ++++++++------
 Modules/socketmodule.h | 2 
 Modules/timemodule.c | 40 ++-
 Python/pytime.c | 480 +++++++++++++++++++++++++++++-----------------
 12 files changed, 645 insertions(+), 471 deletions(-)
Conversion functions require a rounding mode.
I didn't update all tests yet. For example, test_datetime crash, test_time and test_threading fail. There are also 3 remaining FIXME for myself in pytime.c.