land travel from Canada to US

[Androidcharger]

If I travel by car to the US and then return to Canada on the same day, will my stay in Canada be extended for another 6 months or is my stay only valid fro date of entry at the airport?
I have a US tourist visa.

 

[scylla]

If I travel by car to the US and then return to Canada on the same day, will my stay in Canada be extended for another 6 months or is my stay only valid fro date of entry at the airport?
I have a US tourist visa.

It will be up to CBSA.

 

[Androidcharger]

It will be up to CBSA.

Thanks, I mean that if the officer allows me entry to Canada on the land border but does not stamp my passport then that should mean my legal stay is 6 months from this date, right?