There are times the booking/online check in windows don't open "on time" (midnight Eastern time). Sometimes one or the other won't open until the next morning. Occasionally, neither will open until the the next morning.
Another thing, you must log in after midnight EASTERN time to access your booking (when it's working correctly). If you are already logged in (before the magic hour), the system thinks it's whatever time/day it was when you logged in.
One more thought - midnight Eastern time is 45 minutes from now. I think you're too early.
EDITED TO ADD: I just went to the
DCL website. Was able to log in with no problems