Flight cancelled

hi,

i booked my flight for VN leaving on November 5, 2016 - November 28, 2016 from the United States a few months back. I just received a flight cancellation notice from my airline which is Korean Airline for November 5,2016. Korean airline said I can take November 4, 2016 flight instead due to the cancellation. My question is, if my visa is for November 5, 2016 but now i'm leaving November 4, 2016, would there be any issues with boarding the plane or when I get to VN?

thank you.