If somebody has a PR card with Start date from December 2012 and end date of march 2018. Is it okay if he stays 3 years period counting back from march 2018 or should it be counted taking reference of start date.

Pls reply.

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I am positively sure it is from the start date.

I'm not quite sure what you mean by 'counting back from March 2018'. If things have not changed lately, what I know is that you have to be in canada in total of 3 years (3*365 days) in the past four years(4*365 days) to be eligible to apply. If you were in canada within that 4 years and did not have PR, those days will also be counted. For example, you were in canada for 2 years in some other visa before you get your PR, you can apply for citizenship after 1 year of getting PR.