Actually, our credits did not expire on our departure day. On day 4 of our trip, dh decided he wanted to add an extra night and day to our vacation. The CM at the hotel said that the dining plan could not be extended, but that we could have the room and another day of passes. Our original departure day was Nov 10. At 12:05 am, Nov 11, we used 3 CS credits at the Electric Umbrella. The next day we used 6 at Wolfgang Puck Express. I am not sure how that happened, but apparently they do not expire. On Nov 10, we asked Guest Relations at Epcot if they could tell us when our dining credits expired and they said the only thing they could find out is when the theme park passes expired.
Kathleen