I'm not really sure what time that is without looking at a timezone convertor? Typically whenever we hook up, it's around 11 AM - 12 PM and that suits me just fine.
Every gamer in North America that I know is within 3 hours of my timezone so I'm pretty confident it's a good time to meet up.
I don't think you want to push it back any further as it will be getting too late for you guys.