There's a 3 hour difference between Eastern and Pacific time.
But...you wouldn't want to make your dinner reservations at 3 o'clock, just b/c your stomach will be ready at what it thinks of as 6. Unless you're only there one day. Otherwise that's a LONG time until breakfast!
I wanted to add on.
My mom lived in VA for a few years, and before that FL. I was in CA and WA. When I would visit, I would try to get on their schedule ASAP, b/c otherwise I was too "off" the whole time.
However, for a week's vacation, I wouldn't try THAT hard, b/c that's too short a time. In your situation, I would probably halve the difference, or something around that. Maybe the first day try to imagine yourself eating around the time that your stomach is saying something, but like I said, that's a long time between "dinner" and breakfast. Plus, some places will still be on lunch menus, won't they? I'd go a little later for dinner, but have snacks, too. You don't want to mess yourself up for a relatively short stay, but you don't want to starve, either!
Have fun!