No, once the book has been issued to your account the due date will not change.
The only time a loan period of a book will change is if a resource is reserved by another user; the loan period will automatically change to a 7 Day Loan before you issue the book. This is to ensure the fair circulation of resources. Check your self-issue receipt for the due date (rather than relying on the label on the spine). Keep track of your loans online by logging into your account on the library homepage.