Method __format__

Lib/_pydatetime.py:1106–1111

(self, fmt)

        return _wrap_strftime(self, format, self.timetuple())

    def __format__(self, fmt):
        if not isinstance(fmt, str):
            raise TypeError("must be str, not %s" % type(fmt).__name__)
        if len(fmt) != 0:
            return self.strftime(fmt)
        return str(self)

    def isoformat(self):
        """Return the date formatted according to ISO.