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

        :param datetimes: a datetime value list
        :type datetimes: ``osid.calendaring.DateTimeList``
        :return: the display strings
        :rtype: ``string``
        :raise: ``InvalidArgument`` -- ``datetime.get_calendar_type() != get_calendar_type()`` or ``datetime.get_time_type() != get_time_type()``
        :raise: ``NullArgument`` -- ``datetimes`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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