def supports_calendar_time_types(self, calendar_type=None, time_type=None):
Tests if a given calendar and time type are used together in a ``DateTime``.

        arg:    calendar_type (osid.type.Type): the type of the calendar
        arg:    time_type (osid.type.Type): the type of the time system
        return: (boolean) - ``true`` if the given calendar and time
                types are supported, ``false`` otherwise
        raise:  NullArgument - ``calendar_type`` or ``time_type`` is
                ``null``
        *compliance: mandatory -- This method must be implemented.*