I'd call guest services, but from my understanding, you're out of luck. The ticket you buy is for a specific date and the programming code for the tickets tied to your MB is connected to that date (also if you opt for the hard ticket, it displays the date on the ticket). Your best bet might be to buy new tickets for the date you want and sell the ones you don't want (if you do that, you can only reassign the ticket to someone in your friends/family on DME).
A few weeks ago, I was forced to move my vacation back a week and had two MNSSHP tickets already purchased. The CM said that they can move them once for me and never again. She moved them to the following week and I even got a $5 refund for the difference in price (not sure where that came from).
As for the printed tickets, she said to discard those and I will pick up new tickets for both parties at Will Call when I get there.
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