How to use the pyravendb.tools.utils.Utils.datetime_to_string function in pyravendb

def create_request(self, server_node):
            self.url = (f"{server_node.url}/databases/{server_node.database}"
                        f"/timeseries?docId={Utils.quote_key(self._document_id)}"
                        f"{f'&start={self._start}' if self._start > 0 else ''}"
                        f"{f'&pageSize={self._page_size}' if self._page_size < sys.maxsize else ''}")

            for range_ in self._ranges:
                self.url += (f"&name={Utils.quote_key(range_.name)}"
                             f"&from={Utils.datetime_to_string(range_.from_date)}"

def _json_default(o):
        if o is None:
            return None

        if isinstance(o, datetime):
            return Utils.datetime_to_string(o)
        elif isinstance(o, timedelta):
            return Utils.timedelta_to_str(o)
        elif getattr(o, "__dict__", None):
            return o.__dict__
        elif isinstance(o, set):
            return list(o)
        elif isinstance(o, int) or isinstance(o, float):
            return str(o)
        else:
            raise TypeError(repr(o) + " is not JSON serializable (Try add a json default method to store convention)")

def to_json(self):
            _dict = {"Timestamp": Utils.datetime_to_string(self.timestamp), "Values": self.values}
            if self.tag:
                _dict["Tag"] = self.tag
            return _dict

def to_json(self):
            return {"From": Utils.datetime_to_string(self.from_date), "To": Utils.datetime_to_string(self.to_date)}

def to_json(self):
        return {"Query": self.query,
                "ChangeVectorForNextBatchStartingPoint": self.change_vector_for_next_batch_starting_point,
                "SubscriptionId": self.subscription_id, "SubscriptionName": self.subscription_name,
                "LastTimeServerMadeProgressWithDocuments": Utils.datetime_to_string(
                    self.last_time_server_made_progress_with_documents),
                "LastClientConnectionTime": Utils.datetime_to_string(self.last_client_connection_time),
                "Disabled": self.closed}

def to_json(self):
        return {"Query": self.query,
                "ChangeVectorForNextBatchStartingPoint": self.change_vector_for_next_batch_starting_point,
                "SubscriptionId": self.subscription_id, "SubscriptionName": self.subscription_name,
                "LastTimeServerMadeProgressWithDocuments": Utils.datetime_to_string(
                    self.last_time_server_made_progress_with_documents),
                "LastClientConnectionTime": Utils.datetime_to_string(self.last_client_connection_time),
                "Disabled": self.closed}