@abc.abstractmethod<EOL><INDENT>def get_fixed_start_time(self):<DEDENT>
return<EOL>
Gets the fixed start time for this event.

        :return: the fixed start time
        :rtype: ``osid.calendaring.DateTime``
        :raise: ``IllegalState`` -- ``has_fixed_start_ime()`` is ``false``

        *compliance: mandatory -- This method must be implemented.*