I guess rollover at 12pm est makes sense - I'm in pst so I was thinking 12 pst, but I tried at 10pm and it worked. Also, I tried out a code that I saw at my 7-11, but I still got the 'try again tomorrow' thing (at least, I think it was a code, but I couldn't tell; also, it was on the 22oz cup, despite the coupon for bogo being for 28oz...). Are there actually unique codes on the cups?