@abc.abstractmethod<EOL><INDENT>def string_to_date_time(self, s):<DEDENT>
return<EOL>
Parses a date time string.

        :param s: a datetime string
        :type s: ``string``
        :return: the date time value
        :rtype: ``osid.calendaring.DateTime``
        :raise: ``InvalidArgument`` -- ``s`` is not of ``get_date_format_type()`` or ``s`` is not of ``get_time_format_type()``
        :raise: ``NullArgument`` -- ``s`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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