How to use the datacube.api.utils.format_date function in datacube

def get_cell_csv_filename(self):

        acq_min = format_date(self.acq_min)
        acq_max = format_date(self.acq_max)

        # TODO other distinguishing characteristics (e.g. dataset type(s))

        return os.path.join(
            self.output_directory,
            "cells_{satellites}_{x_min:03d}_{x_max:03d}_{y_min:04d}_{y_max:04d}_{acq_min}_{acq_max}.csv".format(
                satellites=get_satellite_string(self.satellites), x_min=self.x_min,
                x_max=self.x_max, y_min=self.y_min, y_max=self.y_max,
                acq_min=acq_min, acq_max=acq_max
            ))

def generate_raster_metadata(self):
        return {
            "X_INDEX": "{x:03d}".format(x=self.x),
            "Y_INDEX": "{y:04d}".format(y=self.y),
            "DATASET_TYPE": self.dataset_type.name,
            "ACQUISITION_DATE": "{acq_min} to {acq_max}".format(acq_min=format_date(self.acq_min), acq_max=format_date(self.acq_max)),
            "SATELLITES": " ".join([s.name for s in self.satellites]),
            "PIXEL_QUALITY_FILTER": self.mask_pqa_apply and " ".join([mask.name for mask in self.mask_pqa_mask]) or "",
            "WATER_FILTER": self.mask_wofs_apply and " ".join([mask.name for mask in self.mask_wofs_mask]) or ""
        }

def get_tile_csv_filename(self):

        acq_min = format_date(self.acq_min)
        acq_max = format_date(self.acq_max)

        # TODO other distinguishing characteristics (e.g. dataset types)

        return os.path.join(
            self.output_directory,
            "tiles_{satellites}_{x_min:03d}_{x_max:03d}_{y_min:04d}_{y_max:04d}_{acq_min}_{acq_max}.csv".format(
                satellites=get_satellite_string(self.satellites),
                x_min=self.x, x_max=self.x, y_min=self.y, y_max=self.y,
                acq_min=acq_min, acq_max=acq_max
            ))

def generate_raster_metadata(self):
        return {
            "X_INDEX": "{x:03d}".format(x=self.x),
            "Y_INDEX": "{y:04d}".format(y=self.y),
            "DATASET_TYPE": self.dataset_type.name,
            "ACQUISITION_DATE": "{acq_min} to {acq_max}".format(acq_min=format_date(self.acq_min), acq_max=format_date(self.acq_max)),
            "SATELLITES": " ".join([s.name for s in self.satellites]),
            "PIXEL_QUALITY_FILTER": self.mask_pqa_apply and " ".join([mask.name for mask in self.mask_pqa_mask]) or "",
            "WATER_FILTER": self.mask_wofs_apply and " ".join([mask.name for mask in self.mask_wofs_mask]) or ""
        }

def get_tile_csv_filename(self):

        acq_min = format_date(self.acq_min)
        acq_max = format_date(self.acq_max)

        # TODO other distinguishing characteristics (e.g. dataset types)

        return os.path.join(
            self.output_directory,
            "tiles_{satellites}_{x_min:03d}_{x_max:03d}_{y_min:04d}_{y_max:04d}_{acq_min}_{acq_max}.csv".format(
                satellites=get_satellite_string(self.satellites),
                x_min=self.x, x_max=self.x, y_min=self.y, y_max=self.y,
                acq_min=acq_min, acq_max=acq_max
            ))

def generate_raster_metadata(self):
        return {
            "X_INDEX": "{x:03d}".format(x=self.x),
            "Y_INDEX": "{y:04d}".format(y=self.y),
            "DATASET_TYPE": "{dataset_type} STACK".format(dataset_type=self.dataset_type.name),
            "ACQUISITION_DATE": "{acq_min} to {acq_max}".format(acq_min=format_date(self.acq_min), acq_max=format_date(self.acq_max)),
            "SEASON": self.season.name,
            "SATELLITES": " ".join([s.name for s in self.satellites]),
            "PIXEL_QUALITY_FILTER": self.mask_pqa_apply and " ".join([mask.name for mask in self.mask_pqa_mask]) or ""
        }

def get_tile_csv_filename(self):

        acq_min = format_date(self.acq_min)
        acq_max = format_date(self.acq_max)

        # TODO other distinguishing characteristics (e.g. dataset types)

        return os.path.join(
            self.output_directory,
            "tiles_{satellites}_{x_min:03d}_{x_max:03d}_{y_min:04d}_{y_max:04d}_{acq_min}_{acq_max}.csv".format(
                satellites=get_satellite_string(self.satellites),
                x_min=self.x, x_max=self.x, y_min=self.y, y_max=self.y,
                acq_min=acq_min, acq_max=acq_max
            ))

mask = get_mask_wofs(wofs, self.mask_wofs_mask, mask=mask)

                # _log.info("mask[3500,3500] is [%s]", mask[3500, 3500])

                data = get_dataset_data_masked(dataset, mask=mask, ndv=ndv)

                _log.debug("data is [%s]", data)
                # _log.info("data[3500,3500] is [%s]", data[band][3500, 3500])

                stack_band = raster.GetRasterBand(index)

                stack_band.SetDescription(os.path.basename(dataset.path))
                stack_band.SetNoDataValue(ndv)
                stack_band.WriteArray(data[band])
                stack_band.ComputeStatistics(True)
                stack_band.SetMetadata({"ACQ_DATE": format_date(tile.end_datetime), "SATELLITE": dataset.satellite.name})

                stack_band.FlushCache()
                del stack_band

            if raster:
                raster.FlushCache()
                raster = None
                del raster