I had this same question when I applied in the 2009 cycle (Submitted July 08) with a DAT score from June '06. I called all the schools that I was applying to that had a 2 year limit on DAT scores and, if my memory serves me correct, they all said that I was ok as long as I had everything complete and to them before 2 years had passed. Basically, if you submit early (as you should) and have your file complete and sent out by aadsas in the first few batches, you should be fine.
You should, however, call all the schools with 2 year limits just to dbl check.