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I have re entered Canada last week from buffalo, NY. Do I get my stay extended from that day?
How long were you outside Canada and where did you go? Was your passport re-stamped?
 
I went to Niagara, NY and stayed there for 3 hours.
It's possible that you were readmitted under the original terms of entry and did not get reset.
 
How do I confirm it as if it doesn’t happen then I have to apply for extension. What do you suggest?
Did you get a new stamp in your passport? Or, did they wave you through after asking where you were?
 
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=473&top=4

How can I extend my stay as a visitor?
If you want to extend your stay in Canada, you should apply at least 30 days before your status expires.

For the steps to apply, see How to apply to extend your stay as a visitor. You can also apply online.

Temporary residents currently in Canada with a valid study or work permit must submit their application for a new temporary resident visa to the Case Processing Centre in Ottawa (CPC-O), or visa office that serves their country of nationality.

  • If your temporary resident status expires after you have submitted your application for an extension but before you receive a decision on your application, you can stay in Canada under what’s called implied status. That means the law implies you are a temporary resident. That status lasts until Immigration, Refugees and Citizenship Canada (IRCC) decides on your new permit application.
  • If you have a single-entry visa this allows you to enter Canada once. If you leave Canada during your authorized stay, you must get a new visitor visa to re-enter Canada, unless you visit the United States or St. Pierre and Miquelon. If you visit those places, you can return to Canada without a new visa, as long as you:
    • return within the period that the Canadian immigration officer initially authorized when you first entered Canada (on your visa, it is either a handwritten date or 6 months from the date of the entry stamp); or
    • have a valid visitor record, work permit, study permit or temporary resident permit (authorizing re-entry), and return within the period that the officer initially authorized.
The bit in RED may be applicable.....
 
No stamp, we were asked to show the return tickets to home country.
I suspect that you are still limited to the original period of entry. An extension application is indicated.
 
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