Is it the Norton plan, that I do not get full 365 days of coverage?

I am getting tired of warnings that my 360 is going to expire, and that I should renew now.  If I do that, I will not have gotten what I paid for (365 days of coverage).  Is this how Norton expects to pay it's bills...by getting me to purchase sooner than I need to?  Why not make it so that once the final 30 days have started, that I can renew, and, add whatever remain days are left, to the new activation period?