They use the same principle as countries that move the clocks forward or back in the middle of the night for Daylight Saving. Ships move relatively slowly so that helps for a start. Even going quickly across timezones, the ship's time would only need to be reset at most every other night. The crew will know that their local time is going to change before they go on watch. Some sentries will get lucky and have an overnight watch that's an hour shorter, some an hour longer. As the ship moves around, they can decide whether or not they need to tweak their time accordingly.
On submarines, it's common to switch to your destination time zone shortly after you leave the pier. Doesn't really matter, since the sun doesn't really affect us except when we come up once or twice a day en route, reporting sunrise/sunset at odd times until it eventually adjusts as we get closer.
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