Board time

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In the case of east-west or west-east voyages on board a ship sailing the oceans , the time change between the zone times is handled quite arbitrarily and the days on which a change takes place is determined according to the operational requirements on board. As a rule, a maximum of one hour is changed per day. The day on which this happens does not necessarily have to coincide with the crossing of the geographical border between two time zones . The clock is usually adjusted in several steps during the night in order to evenly distribute the resulting additional or reduced work to all guards .