>Do you have any suggestion on the best way to go about programming for the problem??

Klas,

1) Don't use date constants
2) Avoid using substr() of dates converted to chars, use MONTH, DAY, YEAR   
   instead
3) Upgrade to VFP 6.0 and use the strictdate settings that insure Y2K 
   compliance

You can even take your VFP 3.0 code and compile it with VFP 6.0 to get references to all of the ambigous date references in the code. The fix the VFP 3.0 code and use it in 3.0.