The Caribbean would get particularly confusing if ships changed to local time at each port of call. Even though time zones are fairly straightforward, the waters get a bit muddied when it comes to daylight saving time. Most Caribbean cruise ports do not set clocks forward in the spring and back in the fall, but a few do. Because of that, some Caribbean itineraries would cause passengers to reset their watches back and forth several times during a short cruise. Many ships in the Caribbean simply advise passengers to stay on cruise ship time when going ashore. That is not usually the case elsewhere around the globe.