On the script, you can use makedate() to create a date based on year, month and day.
The syntax is makedate( Year, Month, Day)
In your case, I didn't understand how to get the Year,
Is your example 24/feb/2001 ?
But it would be something like this:
makedate( 2000+( 100* (LEFT( YOUR_DATE_FIELD, 1)-1)) + mid(YOUR_DATE_FIELD,2,2),
mid(YOUR_DATE_FIELD, 4,2), RIGHT( YOUR_DATE_FIELD, 2) )
Sorry if I forgot some ( or )
Hope it helps,