Just curious?

[BecBennett]

I was just playing around looking at dining reservations for tonight (November 1st). I just basically wanted to see what would have availability at this late notice, I'm no where near the parks, so not booking anything, just looking.

Any hoo, the earliest time it would let me search for was 9pm Is there a reason for this? When I do the search for 9pm I can see availability for as early as 7pm, so I'm just confused as to why I couldn't search for 7pm.