32-bit: ====================================================================== ERROR: test_mktime (test.test_time.TimeTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "/data/prj/python/src/python3-3.7.0/Lib/test/test_time.py", line 446, in test_mktime self.assertEqual(time.mktime(tt), t) OverflowError: mktime argument out of range ====================================================================== FAIL: test_pthread_getcpuclockid (test.test_time.TimeTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "/data/prj/python/src/python3-3.7.0/Lib/test/test_time.py", line 129, in test_pthread_getcpuclockid self.assertNotEqual(clk_id, time.CLOCK_THREAD_CPUTIME_ID) AssertionError: 12 == 12 ---------------------------------------------------------------------- 64-bit: ====================================================================== ERROR: test_mktime (test.test_time.TimeTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/lib/python3.7/test/test_time.py", line 446, in test_mktime self.assertEqual(time.mktime(tt), t) OverflowError: mktime argument out of range ====================================================================== ERROR: test_pthread_getcpuclockid (test.test_time.TimeTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "/opt/lib/python3.7/test/test_time.py", line 130, in test_pthread_getcpuclockid t1 = time.clock_gettime(clk_id) OverflowError: signed integer is greater than maximum The test_mktime failed because time.mktime(time.localtime(-2)) -- actually any negative value in localtime - fails The patch in the file Modules/timemodule.c fixes this. The test_pthread_getcpuclockid is a bit more complex as the result is different depending on 32 or 64-bit mode. In 32-bit mode AIX always responds with the constant CLOCK_THREAD_CPUTIME_ID. The patch in Lib/test/test_time.py makes the test aware of this. In AIX clockid_t is actually long long. However, changing the type to parse to "L" broke many other things. It seems to work as a long ("l") when the ABI is 64-bit. See additional change in Modules/timemodule.c static PyObject * time_clock_gettime Finally, added some (additional) range checking for _PyTime_localtime for AIX. Not having this complicated testing for above.