No one wants to be standing at the pier as their ship sails off into the sunset. Before going ashore, be SURE you really know what time it is!
Ship time vs. local time is a cause for considerable confusion. Whether clocks stay set on "ship" time or are changed as the vessel moves through time zones depends on the ship, the itinerary, and the time of year (whether the US is on standard or daylight savings time). For instance, Grand Cayman doesn't observe daylight savings time.
Cruise Diva shares the ups and downs: "Ship Time" or "Island Time"