Default datetime plugin

        
        def load(markata: "Markata") -> None:
            for article in markata.iter_articles("datetime"):
                try:
                    date = article.metadata["date"]
                except KeyError:
                    date = None
                if isinstance(date, str):
                    date = dateutil.parser.parse(date)
                if isinstance(date, datetime.date):
                    date = datetime.datetime(
                        year=date.year,
                        month=date.month,
                        day=date.day,
                        tzinfo=pytz.utc,
                    )

                article["today"] = datetime.date.today()
                article["now"] = datetime.datetime.now()
                article["datetime"] = date