def get_maximum_date_time(self):
<EOL>if self._kwargs['<STR_LIT>'] not in ['<STR_LIT>']:<EOL><INDENT>raise errors.IllegalState()<EOL><DEDENT>return self._kwargs['<STR_LIT>']<EOL>
Gets the maximum date time value.

        return: (osid.calendaring.DateTime) - the maximum value
        raise:  IllegalState - syntax is not a ``DATETIME``
        *compliance: mandatory -- This method must be implemented.*