The GMTTIMESTAMP data type is similar to the TIMESTAMP data type, except that the values are interpreted as values in Greenwich Mean Time.
DECLARE MyGetGMTTimeStamp GMTTIMESTAMP;
SET MyGetGMTTimeStamp = GMTTIMESTAMP '1999-12-31 23:59:59.999999';
The PutTime reported by WebSphere® MQ on z/OS® and other times or timestamps can be inconsistent if the CVT field is not set correctly.