How to use the nansat.tools.parse_time function in nansat

if len(mtlFileName) > 0:
            mtlFileName = os.path.join(os.path.split(bandFileNames[0])[0],
                                        mtlFileName)
            mtlFileLines = [line.strip() for line in
                            self.read_xml(mtlFileName).split('\n')]
            dateString = [line.split('=')[1].strip()
                          for line in mtlFileLines
                            if ('DATE_ACQUIRED' in line or
                              'ACQUISITION_DATE' in line)][0]
            timeStr = [line.split('=')[1].strip()
                        for line in mtlFileLines
                            if ('SCENE_CENTER_TIME' in line or
                                'SCENE_CENTER_SCAN_TIME' in line)][0]
            time_start = parse_time(dateString + 'T' + timeStr).isoformat()
            time_end = (parse_time(dateString + 'T' + timeStr) +
                        datetime.timedelta(microseconds=60000000)).isoformat()

        self.dataset.SetMetadataItem('time_coverage_start', time_start)
        self.dataset.SetMetadataItem('time_coverage_end', time_end)

        # set platform
        platform = 'LANDSAT'
        if fname[2].isdigit():
            platform += '-'+fname[2]
        ee = pti.get_gcmd_platform(platform)
        self.dataset.SetMetadataItem('platform', json.dumps(ee))

        # set instrument
        instrument = {
        'LANDSAT' : 'MSS',
        'LANDSAT-1' : 'MSS',

def _set_time_coverage_metadata(self, gdal_metadata):
        ### GET START TIME from METADATA
        time_coverage_start = None
        if 'time_coverage_start' in gdal_metadata:
            time_coverage_start = parse_time(
                                    gdal_metadata['time_coverage_start'])

        ### GET END TIME from METADATA
        time_coverage_end = None
        if 'time_coverage_end' in gdal_metadata:
            time_coverage_end = parse_time(
                                    gdal_metadata['time_coverage_end'])

        # set time_coverage_start if available
        if time_coverage_start is not None:
            self.dataset.SetMetadataItem('time_coverage_start',
                                    time_coverage_start.isoformat())
        # set time_coverage_end if available
        if time_coverage_end is not None:
            self.dataset.SetMetadataItem('time_coverage_end',
                                    time_coverage_end.isoformat())

    @property
    def time_coverage_start(self):
        return parse_time(self.get_metadata('time_coverage_start'))

geoTransform = self.dataset.GetGeoTransform()
            if len(geoTransform) == 0:
                geoTransformStr = geoMetadata.get('GeoTransform',
                                                  '(0|1|0|0|0|0|1)')
                geoTransform = eval(geoTransformStr.replace('|', ','))
                self.dataset.SetGeoTransform(geoTransform)

        subMetadata = firstSubDataset.GetMetadata()


        ### GET START TIME from METADATA
        time_coverage_start = None
        if 'start_time' in gdalMetadata:
            time_coverage_start = parse_time(gdalMetadata['start_time'])
        elif 'start_date' in gdalMetadata:
            time_coverage_start = parse_time(gdalMetadata['start_date'])
        elif 'time_coverage_start' in gdalMetadata:
            time_coverage_start = parse_time(
                                        gdalMetadata['time_coverage_start'])

        ### GET END TIME from METADATA
        time_coverage_end = None
        if 'stop_time' in gdalMetadata:
            time_coverage_end = parse_time(gdalMetadata['stop_time'])
        elif 'stop_date' in gdalMetadata:
            time_coverage_end = parse_time(gdalMetadata['stop_date'])
        elif 'time_coverage_stop' in gdalMetadata:
            time_coverage_end = parse_time(
                                        gdalMetadata['time_coverage_stop'])
        elif 'end_time' in gdalMetadata:
            time_coverage_end = parse_time(gdalMetadata['end_time'])
        elif 'end_date' in gdalMetadata:

if 'start_time' in gdalMetadata:
            time_coverage_start = parse_time(gdalMetadata['start_time'])
        elif 'start_date' in gdalMetadata:
            time_coverage_start = parse_time(gdalMetadata['start_date'])
        elif 'time_coverage_start' in gdalMetadata:
            time_coverage_start = parse_time(
                                        gdalMetadata['time_coverage_start'])

        ### GET END TIME from METADATA
        time_coverage_end = None
        if 'stop_time' in gdalMetadata:
            time_coverage_end = parse_time(gdalMetadata['stop_time'])
        elif 'stop_date' in gdalMetadata:
            time_coverage_end = parse_time(gdalMetadata['stop_date'])
        elif 'time_coverage_stop' in gdalMetadata:
            time_coverage_end = parse_time(
                                        gdalMetadata['time_coverage_stop'])
        elif 'end_time' in gdalMetadata:
            time_coverage_end = parse_time(gdalMetadata['end_time'])
        elif 'end_date' in gdalMetadata:
            time_coverage_end = parse_time(gdalMetadata['end_date'])
        elif 'time_coverage_end' in gdalMetadata:
            time_coverage_end = parse_time(
                                        gdalMetadata['time_coverage_end'])

        ### GET start time from time variable
        if (time_coverage_start is None and 'time#standard_name' in subMetadata and
                 subMetadata['time#standard_name'] == 'time' and 'time#units' in subMetadata):
            # get data from netcdf data
            ncFile = Dataset(inputFileName, 'r')
            time_var = ncFile.variables['time']
            t0 = time_var[0]

def _set_time_coverage_metadata(self, gdal_metadata):
        ### GET START TIME from METADATA
        time_coverage_start = None
        if 'time_coverage_start' in gdal_metadata:
            time_coverage_start = parse_time(
                                    gdal_metadata['time_coverage_start'])

        ### GET END TIME from METADATA
        time_coverage_end = None
        if 'time_coverage_end' in gdal_metadata:
            time_coverage_end = parse_time(
                                    gdal_metadata['time_coverage_end'])

        # set time_coverage_start if available
        if time_coverage_start is not None:
            self.dataset.SetMetadataItem('time_coverage_start',
                                    time_coverage_start.isoformat())
        # set time_coverage_end if available
        if time_coverage_end is not None:
            self.dataset.SetMetadataItem('time_coverage_end',
                                    time_coverage_end.isoformat())

def _set_time_coverage_metadata(self, gdal_metadata):
        ### GET START TIME from METADATA
        time_coverage_start = None
        if 'time_coverage_start' in gdal_metadata:
            time_coverage_start = parse_time(
                                    gdal_metadata['time_coverage_start'])

        ### GET END TIME from METADATA
        time_coverage_end = None
        if 'time_coverage_end' in gdal_metadata:
            time_coverage_end = parse_time(
                                    gdal_metadata['time_coverage_end'])

        # set time_coverage_start if available
        if time_coverage_start is not None:
            self.dataset.SetMetadataItem('time_coverage_start',
                                    time_coverage_start.isoformat())
        # set time_coverage_end if available
        if time_coverage_end is not None:
            self.dataset.SetMetadataItem('time_coverage_end',
                                    time_coverage_end.isoformat())