Well its a little confusing. I'm in California ( PST ) and NCL is in FL, 3 hours ahead. Booking becomes available at 12:00 am EST on day 125 so I was able to book at 9:00 PM PST time with my app still showing 126 days until cruise due to my time zone.
Highly recommend booking as soon as its available because I was able to choose any time from 5:00 PM on with any specialty restaurant. I checked this morning 8 hours later and now the only availability is from 8:00 PM on. Hope this helps.