The system date (QDATE) is used to indicate the year, the month, and the day on the system.
This value is made up of the QYEAR, QMONTH, and QDAY system values. The format in which QDATE appears is specified by the QDATFMT system value. You can change the system date. If you change QDATE, the change may affect the system values for QCENTURY, QYEAR, QMONTH, QDAY, and QDAYOFWEEK. Any change you make to QDATE takes effect immediately.