This looks pretty slick! Just one thing that bit me: You have the dates and times (and the cutoff date and time) already filled out with defaults, but I can't just accept them. If if try, it says they are invalid, so I have to go back and select the exact same dates and times from the menu. I think it would be better if you left them blank, or pre-populate with text that can't be confused for a valid entry. e.g. "choose a date" instead of "Friday, December 2, 2011"

edit: hm, it actually says "Friday, November 11, 2011" but apparently I didn't read past the word "Friday". Still kind of confusing :)