Rhapsody - 2nd Formal Night

We're curious if the second formal night on the Western itinerary on the Rhapsody will be the 5th or 6th night. The fifth night has a 6:00 PM departure from Belize and the sixth has a 4:00 PM departure from Costa Maya. I found a Western itinerary from a year ago and it was the 6th night. But, the itinerary is not exactly the same. Any recent cruisers on the Rhapsody?

Western route - Grand Cayman, Cozumel, Belize, Costa Maya - January 2018

2nd formal night was Day 6 - Costa Maya

Thanks for the info!