TRV Extension not applied for 30 days in advance, what to do?

[fbf2006]

I hope someone can help out with this question.

If a temporary resident visa holder (be it a visitor or a worker) forgot to apply for an extension and/or change of conditions of his temporary status in Canada, at least 30 days before the expiry of his status, can he still apply for extension before his status expires? If so, would this person still be eligible to stay in the country till he gets an approval/rejection?

Thanks.