I just received my UK permanent residence  as EU for the period from Nov 2010 to Dec 2015. Now to apply for UK citizenship I know you need to have the permanent residence for at least 1 year. Is that year calculated from the moment you receive the card or from when you have been granted permanent residentship? 
I will explain in another way:
The actual permanent residence card starts from November 2018 (the month the card has been issued) because I just applied for that (again for 5 year 2010-2015).
However in the attached document states I have been granted residentship from Dec 2015. 

Which one counts to calculate 12 months of  permanent residence status?