Midnight Eastern time. You need to log into your reservation after midnight. In the past, already being logged n and just hitting "refresh" didn't do it.
Also, for booking excursions/adult dining/spa/nursery you must be Paid in Full.
I logged in at 12:02 am the day I could check in. Since it was our first Disney cruise, we got the second PAT of 10:45. We didn't want a cabana or specialty dining, but all the excursions seemed to be still available. Good luck!
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