How to use the trakt.core.helpers.to_iso8601 function in trakt

'plays': self.plays if self.plays is not None else 0,
            'progress': self.progress,

            'last_watched_at': to_iso8601(self.last_watched_at),
            'collected_at': to_iso8601(self.collected_at),
            'paused_at': to_iso8601(self.paused_at),

            'ids': dict([
                (key, value) for (key, value) in self.keys[1:]  # NOTE: keys[0] is the (, ) identifier
            ])
        })

        if self.rating:
            result['rating'] = self.rating.value
            result['rated_at'] = to_iso8601(self.rating.timestamp)

        return result

def to_dict(self):
        result = self.to_identifier()

        result.update({
            'watched': 1 if self.is_watched else 0,
            'collected': 1 if self.is_collected else 0,

            'plays': self.plays if self.plays is not None else 0,
            'progress': self.progress,

            'last_watched_at': to_iso8601(self.last_watched_at),
            'collected_at': to_iso8601(self.collected_at),
            'paused_at': to_iso8601(self.paused_at)
        })

        if self.rating:
            result['rating'] = self.rating.value
            result['rated_at'] = to_iso8601(self.rating.timestamp)

        return result

params.append(id)

        # Build query
        query = {}

        if page:
            query['page'] = page

        if per_page:
            query['limit'] = per_page

        if start_at:
            query['start_at'] = to_iso8601(start_at)

        if end_at:
            query['end_at'] = to_iso8601(end_at)

        # Request watched history
        return super(SyncHistoryInterface, self).get(
            media, store, params,
            query=query,
            flat=True,
            **kwargs
        )

def to_dict(self):
        result = self.to_identifier()

        result['seasons'] = [
            season.to_dict()
            for season in self.seasons.values()
        ]

        if self.rating:
            result['rating'] = self.rating.value
            result['rated_at'] = to_iso8601(self.rating.timestamp)

        return result

def to_dict(self):
        result = self.to_identifier()

        result.update({
            'ids': dict([
                (key, value) for (key, value) in self.keys[1:]  # NOTE: keys[0] is the season identifier
            ])
        })

        if self.rating:
            result['rating'] = self.rating.value
            result['rated_at'] = to_iso8601(self.rating.timestamp)

        return result

def to_dict(self):
        result = self.to_identifier()

        result.update({
            'watched': 1 if self.is_watched else 0,
            'collected': 1 if self.is_collected else 0,

            'plays': self.plays if self.plays is not None else 0,
            'progress': self.progress,

            'last_watched_at': to_iso8601(self.last_watched_at),
            'collected_at': to_iso8601(self.collected_at),
            'paused_at': to_iso8601(self.paused_at)
        })

        if self.rating:
            result['rating'] = self.rating.value
            result['rated_at'] = to_iso8601(self.rating.timestamp)

        return result

def to_dict(self):
        result = self.to_identifier()

        result.update({
            'title': self.title,

            'watched': 1 if self.is_watched else 0,
            'collected': 1 if self.is_collected else 0,

            'plays': self.plays if self.plays is not None else 0,
            'progress': self.progress,

            'last_watched_at': to_iso8601(self.last_watched_at),
            'collected_at': to_iso8601(self.collected_at),
            'paused_at': to_iso8601(self.paused_at),

            'ids': dict([
                (key, value) for (key, value) in self.keys[1:]  # NOTE: keys[0] is the (, ) identifier
            ])
        })

        if self.rating:
            result['rating'] = self.rating.value
            result['rated_at'] = to_iso8601(self.rating.timestamp)

        return result