How is the due date calculated on a recurring invoice?

How is the due date calculated on a recurring invoice?

Hi 

I may have misunderstood how this is set up but can't seem to find answer on help.

I have a monthly invoice I need to send out and the due date is say 5th of every month.

So now I want to make this a recurring invoice sent 2 weeks before the 5th of every month.

How can I set this up?

Do I choose "Net Terms 14" say and that will automatically adjust the due date + 14 days the start date of the invoice?

Which doesn't make sense as it won't always land you on the 5th of the month.

Thanks

Gene