def asDateTime(self):
        """Create :py:class:`datetime.datetime` object from a |ASN.1| object.

        Returns
        -------
        :
            new instance of :py:class:`datetime.datetime` object
        """
        text = str(self)
        if text.endswith('Z'):
            tzinfo = TimeMixIn.UTC
            text = text[:-1]

        elif '-' in text or '+' in text:
            if '+' in text:
                text, plusminus, tz = string.partition(text, '+')
            else:
                text, plusminus, tz = string.partition(text, '-')

            if self._shortTZ and len(tz) == 2:
                tz += '00'

            if len(tz) != 4:
                raise error.PyAsn1Error('malformed time zone offset %s' % tz)

            try:
                minutes = int(tz[:2]) * 60 + int(tz[2:])
                if plusminus == '-':
                    minutes *= -1

            except ValueError:
                raise error.PyAsn1Error('unknown time specification %s' % self)

            tzinfo = TimeMixIn.FixedOffset(minutes, '?')

        else:
            tzinfo = None

        if '.' in text or ',' in text:
            if '.' in text:
                text, _, ms = string.partition(text, '.')
            else:
                text, _, ms = string.partition(text, ',')

            try:
                ms = int(ms) * 1000

            except ValueError:
                raise error.PyAsn1Error('bad sub-second time specification %s' % self)

        else:
            ms = 0

        if self._optionalMinutes and len(text) - self._yearsDigits == 6:
            text += '0000'
        elif len(text) - self._yearsDigits == 8:
            text += '00'

        try:
            dt = dateandtime.strptime(text, self._yearsDigits == 4 and '%Y%m%d%H%M%S' or '%y%m%d%H%M%S')

        except ValueError:
            raise error.PyAsn1Error('malformed datetime format %s' % self)

        return dt.replace(microsecond=ms, tzinfo=tzinfo)
Create :py:class:`datetime.datetime` object from a |ASN.1| object.

        Returns
        -------
        :
            new instance of :py:class:`datetime.datetime` object
        
stackoverflow/venv/lib/python3.6/site-packages/pyasn1/type/useful.py