shipping method base on current date ?

[Francois Lepretre <lepretre@club-internet.fr>]

Hello Minivend gurus,

As my products have a date field, I am looking for a way to define a
shipping price based on current date.
For example,
- if (product's date - current date) >   10 days, then shipping price =
10 $
- else shipping price = 20 $

I tried to set up this as described in doc about fedex, by creating a
fedex_cost perl subroutine in catalog.cfg.
But minivend complains about this function in catalog.cfg when starting.

Documentation is not really clear on this part. How is the right way to
use a fedex_cost subroutine ?

Is there a more clever way to define the shipping method I am looking
for ?

Many thanks in advance for your help.

Francois