The year (QYEAR) is used to specify the last 2 digits of the year on the system.
This value ranges from 0 through 99. The system assigns the first two digits for the year based on the current setting for the QCENTURY system value. If the calculated year falls outside the range of dates supported by the system (1928 to 2053), the QCENTURY system value is changed so that the calculated year is within the supported range.
If you change this system value:
For example, if you change QYEAR from 95 to 13, the system changes QCENTURY from 0 to 1, indicating a year of 2013. However, if you change QYEAR from 95 to 45, the system will not change QCENTURY, because both 1945 and 2045 are valid dates.
If you change this value, the change takes effect immediately. Changing this value also affects the system value QDATE.