@abc.abstractmethod<EOL><INDENT>def set_end(self, end):<DEDENT>
pass<EOL>
Sets the end time.

        :param end: the new end time
        :type end: ``osid.calendaring.DateTime``
        :raise: ``InvalidArgument`` -- ``end`` is invalid
        :raise: ``NoAccess`` -- ``end`` cannot be modified
        :raise: ``NullArgument`` -- ``end`` is ``null``

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