@abc.abstractmethod<EOL><INDENT>def time_to_string(self, time):<DEDENT>
return<EOL>
Gets a string representation of a time.

        :param time: a time value
        :type time: ``osid.calendaring.Time``
        :return: the display string
        :rtype: ``string``
        :raise: ``InvalidArgument`` -- ``time.get_time_type() != get_time_type()``
        :raise: ``NullArgument`` -- ``time`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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