Parse an ISO 8601 formatted time stamp.

        Args:
            timestamp (str): Timestamp to parse

        Returns:
            Timestamp: Parsed timestamp

def parse_isoformat(timestamp):
        """Parse an ISO 8601 formatted time stamp.

        Args:
            timestamp (str): Timestamp to parse

        Returns:
            Timestamp: Parsed timestamp
        """
        if len(timestamp) == 20:
            zone = TzOffset('+00:00')
            timestamp = timestamp[:-1]
        elif len(timestamp) == 24:
            zone = TzOffset('%s:%s' % (timestamp[-5:-2], timestamp[-2:]))
            timestamp = timestamp[:-5]
        elif len(timestamp) == 25:
            zone = TzOffset(timestamp[-6:])
            timestamp = timestamp[:-6]
        timestamp = Timestamp.strptime(timestamp, '%Y-%m-%dT%H:%M:%S')
        timestamp = timestamp.replace(tzinfo=zone)
        return timestamp