During World Cruises and Transatlantic crossings, clocks are adjusted where necessary, so that when arriving into a new country with a different time zone, the last clocks will have been adjusted accordingly (ahead or behind of UK time).
An example of this would be when travelling into New York clocks will be adjusted by 5 hours behind the UK, or vice versa during the sea days to New York.
You will be notified of the time changes in the The Daily Programme the on board news paper.