Message 249791 - Python tracker

It looks like this patch violates fromtimestamp(s) == EPOCH + timedelta(seconds=s) invariant:

Python 3.6.0a0 (default:73911e6c97c8, Sep  4 2015, 13:14:12)
>>> E = datetime(1970,1,1,tzinfo=timezone.utc)
>>> s = -1/2**7
>>> datetime.fromtimestamp(s, timezone.utc) == E + timedelta(seconds=s)
False