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Please identify the Python version, OS and C runtime you're 
using.  Here on Windows 2.3.3,

>>> import time
>>> time.ctime(-2**31)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ValueError: unconvertible time
>>>

The C standard doesn't define the range of convertible values 
for ctime().  Python raises ValueError if and only if the 
platform ctime() returns a NULL pointer.