We haven't cruised since 2019. We have a 7 day booked on the Panorama out of Long Beach leaving 12/3/2022. My wife and I are Platinum, and I understand that we can "check-in" online 16 days prior to 12/3, and select an arrival appointment window. When precisely does the "16 days prior" start? Is it 12:01am on November 17th? If so, which time zone? The one I'm in, the one the cruise leaves from or EST where Carnival is headquartered?
TIA
Mark