def deregister_calendar(self, name):
        """
        If a calendar is registered with the given name, it is de-registered.

        Parameters
        ----------
        cal_name : str
            The name of the calendar to be deregistered.
        """
        self._calendars.pop(name, None)
        self._calendar_factories.pop(name, None)
        self._aliases.pop(name, None)
If a calendar is registered with the given name, it is de-registered.

        Parameters
        ----------
        cal_name : str
            The name of the calendar to be deregistered.