Alexander Belopolsky added the comment:
We still have the following in Lib/test/test_time.py:
# Issue #13312: it may return wrong value for year < TIME_MINYEAR + 1900
# Skip the value test, but check that no error is raised
self.yearstr(TIME_MINYEAR)
I reviewed the current time.asctime() code and it does look like it invokes
undefined behavior for extremely large negative years.
The problem is that in C struct tm, year is stored as year - 1900 and for year
< -2147481748 (= -2**31 + 1900) we trigger an overflow of a signed integer.
Can someone confirm that on AMD64 FreeBSD subtracting 1900 from -2147483648 and
then adding it back does not give -2147483648?
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<http://bugs.python.org/issue13312>
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