In Mac/Modules/file/_Filemodule.c UTCDateTime values are 
converted using these functions:
 
static int
UTCDateTime_Convert(PyObject *v, UTCDateTime *ptr)
{
        return PyArg_Parse(v, "(HlH)", &ptr->highSeconds, &ptr-
>lowSeconds, &ptr->fraction);
}

static PyObject *
UTCDateTime_New(UTCDateTime *ptr)
{
        return Py_BuildValue("(HlH)", ptr->highSeconds, ptr-
>lowSeconds, ptr->fraction);
}


Shouldn't the format string be "(HLH)" in both cases? The struct 
definition of UTCDateTime contains unsigned times (UInt16, UInt32 
and UInt16).

The same problem is present in Python 2.3