>>> datetime.datetime.max
datetime.datetime(9999, 12, 31, 23, 59, 59, 999999)
>>> time.mktime((2038, 12, 31, 0, 0, 0, -1, -1, -1))
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
OverflowError: mktime argument out of range