Can anyone tell me why the following code used to work (under VFP50) and now, all of a sudden, gives me an error message "Operator/operandi mismatch" ? The underlying field is formatted for datetime and I haven't changed anything else (that I'm aware of) to cause this sudden refusal to work syndrome! Century is set on. Thanks in advance.

IF !EMPTY(THIS.Value) < DATETIME()
= MESSAGEBOX("You need to enter a VALID date or time",1,"ERROR MESSAGE")
RETURN .F.
ELSE
RETURN .T.
ENDIF

Linda