def METHOD_NAME(self, record: MutableMapping[str, Any]) -> MutableMapping[str, Any]:
    """
    Transform 'date-time' items to RFC3339 format
    """
    date_time_paths = self._get_date_time_dpath_from_schema()
    for path in date_time_paths:
        if "*" not in path:
            if field_value := dpath.util.get(record, path, default=None):
                dpath.util.set(record, path, pendulum.parse(field_value).to_rfc3339_string())
        else:
            if field_values := dpath.util.values(record, path):
                for i, date_time_value in enumerate(field_values):
                    dpath.util.set(record, path.replace("*", str(i)), pendulum.parse(date_time_value).to_rfc3339_string())
    return record