How to use the plexapi.utils.toDatetime function in PlexAPI

def _loadData(self, data):
        """ Load attribute values from Plex XML response. """
        self._data = data
        self.listType = 'video'
        self.addedAt = utils.toDatetime(data.attrib.get('addedAt'))
        self.key = data.attrib.get('key', '')
        self.lastViewedAt = utils.toDatetime(data.attrib.get('lastViewedAt'))
        self.librarySectionID = data.attrib.get('librarySectionID')
        self.ratingKey = utils.cast(int, data.attrib.get('ratingKey'))
        self.summary = data.attrib.get('summary')
        self.thumb = data.attrib.get('thumb')
        self.title = data.attrib.get('title')
        self.titleSort = data.attrib.get('titleSort', self.title)
        self.type = data.attrib.get('type')
        self.updatedAt = utils.toDatetime(data.attrib.get('updatedAt'))
        self.viewCount = utils.cast(int, data.attrib.get('viewCount', 0))

def _loadData(self, data):
        """ Load attribute values from Plex XML response. """
        Playable._loadData(self, data)
        self.addedAt = toDatetime(data.attrib.get('addedAt'))
        self.composite = data.attrib.get('composite')  # url to thumbnail
        self.duration = cast(int, data.attrib.get('duration'))
        self.durationInSeconds = cast(int, data.attrib.get('durationInSeconds'))
        self.guid = data.attrib.get('guid')
        self.key = data.attrib.get('key')
        self.key = self.key.replace('/items', '') if self.key else self.key  # FIX_BUG_50
        self.leafCount = cast(int, data.attrib.get('leafCount'))
        self.playlistType = data.attrib.get('playlistType')
        self.ratingKey = cast(int, data.attrib.get('ratingKey'))
        self.smart = cast(bool, data.attrib.get('smart'))
        self.summary = data.attrib.get('summary')
        self.title = data.attrib.get('title')
        self.type = data.attrib.get('type')
        self.updatedAt = toDatetime(data.attrib.get('updatedAt'))

self._data = data
        self.agent = data.attrib.get('agent')
        self.allowSync = utils.cast(bool, data.attrib.get('allowSync'))
        self.art = data.attrib.get('art')
        self.composite = data.attrib.get('composite')
        self.createdAt = utils.toDatetime(data.attrib.get('createdAt'))
        self.filters = data.attrib.get('filters')
        self.key = data.attrib.get('key')  # invalid key from plex
        self.language = data.attrib.get('language')
        self.locations = self.listAttrs(data, 'path', etag='Location')
        self.refreshing = utils.cast(bool, data.attrib.get('refreshing'))
        self.scanner = data.attrib.get('scanner')
        self.thumb = data.attrib.get('thumb')
        self.title = data.attrib.get('title')
        self.type = data.attrib.get('type')
        self.updatedAt = utils.toDatetime(data.attrib.get('updatedAt'))
        self.uuid = data.attrib.get('uuid')

def _loadData(self, data):
        """ Load attribute values from Plex XML response. """
        self._data = data
        self.listType = 'audio'
        self.addedAt = utils.toDatetime(data.attrib.get('addedAt'))
        self.index = data.attrib.get('index')
        self.key = data.attrib.get('key')
        self.lastViewedAt = utils.toDatetime(data.attrib.get('lastViewedAt'))
        self.librarySectionID = data.attrib.get('librarySectionID')
        self.ratingKey = utils.cast(int, data.attrib.get('ratingKey'))
        self.summary = data.attrib.get('summary')
        self.thumb = data.attrib.get('thumb')
        self.title = data.attrib.get('title')
        self.titleSort = data.attrib.get('titleSort', self.title)
        self.type = data.attrib.get('type')
        self.updatedAt = utils.toDatetime(data.attrib.get('updatedAt'))
        self.viewCount = utils.cast(int, data.attrib.get('viewCount', 0))

def _loadData(self, data):
        """ Load attribute values from Plex XML response. """
        self._data = data
        self.listType = 'audio'
        self.addedAt = utils.toDatetime(data.attrib.get('addedAt'))
        self.index = data.attrib.get('index')
        self.key = data.attrib.get('key')
        self.lastViewedAt = utils.toDatetime(data.attrib.get('lastViewedAt'))
        self.librarySectionID = data.attrib.get('librarySectionID')
        self.ratingKey = utils.cast(int, data.attrib.get('ratingKey'))
        self.summary = data.attrib.get('summary')
        self.thumb = data.attrib.get('thumb')
        self.title = data.attrib.get('title')
        self.titleSort = data.attrib.get('titleSort', self.title)
        self.type = data.attrib.get('type')
        self.updatedAt = utils.toDatetime(data.attrib.get('updatedAt'))
        self.viewCount = utils.cast(int, data.attrib.get('viewCount', 0))

def _loadData(self, data):
        """ Load attribute values from Plex XML response. """
        Video._loadData(self, data)
        Playable._loadData(self, data)
        self.art = data.attrib.get('art')
        self.audienceRating = utils.cast(float, data.attrib.get('audienceRating'))
        self.audienceRatingImage = data.attrib.get('audienceRatingImage')
        self.chapterSource = data.attrib.get('chapterSource')
        self.contentRating = data.attrib.get('contentRating')
        self.duration = utils.cast(int, data.attrib.get('duration'))
        self.guid = data.attrib.get('guid')
        self.originalTitle = data.attrib.get('originalTitle')
        self.originallyAvailableAt = utils.toDatetime(
            data.attrib.get('originallyAvailableAt'), '%Y-%m-%d')
        self.primaryExtraKey = data.attrib.get('primaryExtraKey')
        self.rating = utils.cast(float, data.attrib.get('rating'))
        self.ratingImage = data.attrib.get('ratingImage')
        self.studio = data.attrib.get('studio')
        self.tagline = data.attrib.get('tagline')
        self.userRating = utils.cast(float, data.attrib.get('userRating'))
        self.viewOffset = utils.cast(int, data.attrib.get('viewOffset', 0))
        self.year = utils.cast(int, data.attrib.get('year'))
        self.collections = self.findItems(data, media.Collection)
        self.countries = self.findItems(data, media.Country)
        self.directors = self.findItems(data, media.Director)
        self.fields = self.findItems(data, media.Field)
        self.genres = self.findItems(data, media.Genre)
        self.media = self.findItems(data, media.Media)
        self.producers = self.findItems(data, media.Producer)

def _loadData(self, data):
        """ Load attribute values from Plex XML response. """
        self.listType = 'photo'
        self.addedAt = utils.toDatetime(data.attrib.get('addedAt'))
        self.index = utils.cast(int, data.attrib.get('index'))
        self.key = data.attrib.get('key')
        self.originallyAvailableAt = utils.toDatetime(
            data.attrib.get('originallyAvailableAt'), '%Y-%m-%d')
        self.parentKey = data.attrib.get('parentKey')
        self.parentRatingKey = data.attrib.get('parentRatingKey')
        self.ratingKey = data.attrib.get('ratingKey')
        self.summary = data.attrib.get('summary')
        self.thumb = data.attrib.get('thumb')
        self.title = data.attrib.get('title')
        self.type = data.attrib.get('type')
        self.updatedAt = utils.toDatetime(data.attrib.get('updatedAt'))
        self.year = utils.cast(int, data.attrib.get('year'))
        self.media = self.findItems(data, media.Media)

self.platformVersion = data.attrib.get('platformVersion')
        self.pluginHost = cast(bool, data.attrib.get('pluginHost'))
        self.readOnlyLibraries = cast(int, data.attrib.get('readOnlyLibraries'))
        self.requestParametersInCookie = cast(bool, data.attrib.get('requestParametersInCookie'))
        self.streamingBrainVersion = data.attrib.get('streamingBrainVersion')
        self.sync = cast(bool, data.attrib.get('sync'))
        self.transcoderActiveVideoSessions = int(data.attrib.get('transcoderActiveVideoSessions', 0))
        self.transcoderAudio = cast(bool, data.attrib.get('transcoderAudio'))
        self.transcoderLyrics = cast(bool, data.attrib.get('transcoderLyrics'))
        self.transcoderPhoto = cast(bool, data.attrib.get('transcoderPhoto'))
        self.transcoderSubtitles = cast(bool, data.attrib.get('transcoderSubtitles'))
        self.transcoderVideo = cast(bool, data.attrib.get('transcoderVideo'))
        self.transcoderVideoBitrates = utils.toList(data.attrib.get('transcoderVideoBitrates'))
        self.transcoderVideoQualities = utils.toList(data.attrib.get('transcoderVideoQualities'))
        self.transcoderVideoResolutions = utils.toList(data.attrib.get('transcoderVideoResolutions'))
        self.updatedAt = utils.toDatetime(data.attrib.get('updatedAt'))
        self.updater = cast(bool, data.attrib.get('updater'))
        self.version = data.attrib.get('version')
        self.voiceSearch = cast(bool, data.attrib.get('voiceSearch'))

def _loadData(self, data):
        self.sessionKey = utils.cast(int, data.attrib.get('sessionKey'))            # session
        self.usernames = self.listAttrs(data, 'title', etag='User')                 # session
        self.players = self.findItems(data, etag='Player')                          # session
        self.transcodeSessions = self.findItems(data, etag='TranscodeSession')      # session
        self.session = self.findItems(data, etag='Session')                         # session
        self.viewedAt = utils.toDatetime(data.attrib.get('viewedAt'))               # history
        self.playlistItemID = utils.cast(int, data.attrib.get('playlistItemID'))    # playlist

def _loadData(self, data):
        """ Load attribute values from Plex XML response. """
        Audio._loadData(self, data)
        self.art = data.attrib.get('art')
        self.key = self.key.replace('/children', '')  # fixes bug #50
        self.originallyAvailableAt = utils.toDatetime(data.attrib.get('originallyAvailableAt'), '%Y-%m-%d')
        self.parentKey = data.attrib.get('parentKey')
        self.parentRatingKey = data.attrib.get('parentRatingKey')
        self.parentThumb = data.attrib.get('parentThumb')
        self.parentTitle = data.attrib.get('parentTitle')
        self.studio = data.attrib.get('studio')
        self.year = utils.cast(int, data.attrib.get('year'))
        self.genres = self.findItems(data, media.Genre)
        self.collections = self.findItems(data, media.Collection)