python中mktime的问题？

Question

import time
t=time.strptime("1969-Sep-23 00:00:00",'%Y-%b-%d %H:%M:%S')
s=time.mktime(t)

错误提示：OverflowError:mktime argument out of range.

如果把时间改成1970-Sep-23 00:00:00 就不会出现错误。

为什么？

Answer 1

The timestamp starts from 1970, the earliest is 1970

Answer 2

I did not report an error here, but returned a negative number. Related information: Linux x86_64, Python 2.7.9 & 3.4.3, glibc 2.21. You should also provide this information.