Oh that date would be for landing. I am already in Canada. CEC category. Thank you for clarification.COPR only gives the date before which you have to land in Canada. Once you become a PR, you can stay in Canada indefinitely. However, you will have to maintain the physical presence status, i.e. you must have been in Canada for at least 730 days during the last five years.
The PR card is valid for 5 years, after which it has to be renewed.