You're right.
I only changed now because of the high p/x and the Honda 5 year multi deal. Being so close to the reg change I just thought, why not
My current Civic was a March 1st , again, on a good deal.
However, that meant that servicing had to be done in Feb and the number of times I've driven on ice and snow to the dealers so I decided this time that Sep with a Aug service is better.