Canada/US HOS question.

I'm parked at the border to cross into the US. I got stuck in some nasty Toronto traffic and wasn't able to make my planned stop for the night. So I'm taking 8 hours of rest off at the border (legal according to Canadian rules) once my 8 hours is up I will cross into the US. Will I be in violation once I enter the US? Or will I have to take the full 10 hours off on the Canadian side to not be in violation when I enter the US. I contacted my company about it and they said I should be legal after 8 hours as long as I take 2 hours off sometime during the day tomorrow. Any thoughts?

edit: I had 4 hours left on my 14 hour clock before I switched to sleeper.

 

I had a total of 4 hours left before I switched into sleeper.

 

My total on duty time in Canada was about 10.5 hours. 10.5 of the 14 hours. I had some time left, but wouldn't make my 10am delivery in Liberty PA if I drove into the night.

 

I see, how does sleeper provision in the US work exactly? I learned US HOS in orientation but they weren't very thorough on it. I'll probably just end up taking the 10 hours off.