The most accurate way to get your due date is fron an early U/S and this can be out by 7 days either way.
I know of so many women being pursuaded to have an induction, especially in the private sector, and usually it is for the convenance of the OB and not the mother or her baby. All I can advise you all is to ask lots of questions and listen to your own body.

Alan (Midwife)