In addition to what Steven wrote, check set SYSFORMATS too as it is also scoped to current datasessions (private)

>I am displaying a date in a form, my problem is that it only displays
>a 2 digit year and the rollover feature of SET CENTURY is not working.
>I set the CENTURY 'ON' AND A ROLLOVER TO '60',
>but none of these features are working in my form.
>I am using VFP 5.0.