'Convert a string representation to a `datetime` object (the object you
will manipulate). This is the reverse function of
`_convert_from_datetime`.
>>> a = \'2011,06,08,20,26,24,092284\'
>>> ComplexDateTimeField()._convert_from_string(a)
datetime.datetime(2011, 6, 8, 20, 26, 24, 92284)'

def _convert_from_string(self, data):

    values = map(int, data.split(self.separator))
    return datetime.datetime(*values)
