The new day's dining reservations become available online at 6:00 a.m. EST. Reserving online gives you a tiny advantage over calling because the telephone reservation center doesn't open until 7:00 a.m.
Guest staying at the Walt Disney World resort hotels can still take advantage of the
90 + 10 day perk
when making their dining reservation online. To do this, you start by
going to the main WDW website page of the first restaurant you want to
make a reservation at. For example,
THIS is the page for Boma. On the left, you'll see a button that says "Make a Reservation." Click there and you'll find
THIS
page. At the top there, you'll see a box that says "Update Your
Profile" and a sentence that reads "Do you have a resort reservation
for the same days for which you're making dining reservations? If so,
please retrieve your reservations." Retrieving your reservation will
allow you to link your dining reservations to your resort stay and will
activate the 90 + 10 option.
You should be aware that there are still a few kinks in the system. The
online dining site is currently only recognizing resort confirmation
numbers made through Disney proper. It is not accepting resort
confirmation numbers generated by travel agencies and the Disney
Vacation Club. Disney is aware of the problem and is working on it. In
the meantime, those guests can still use the 90 + 10 booking option,
but they'll have to do so over the phone.