Question about service transfer

I requested service transfer. I'm moving out of my old place to new place on 19th, so I asked for service cancellation on my place on 19th, and service start on new place on 19th.

However, I need internet access 24/7, so I'm a bit worried if that's gonna be the case.

Does it mean I will be able to use internet service on my old place until END OF DAY on 19th, and I will be able to use internet service in my new place at BEGINNING OF 19th? Because that's what I need. 

The only date I can pick is 19th or later for start of new service in my new place, so I cannot make it any earlier than that.