part of the Earth surface where the same time is adopted by convention Ideally, it is an area bounded between two meridians spaced by 15 degrees of longitude Practically, for administrative and political reasons, it is often bounded by state borders that better approximate the two meridians
interval of longitudes 15 degrees wide in which every clock is set to the same time (e g , every clock in the Pacific time zone will give the same time)
A time zone is one of the areas into which the world is divided where the time is calculated as being a particular number of hours behind or ahead of GMT. Any of the 24 longitudinal divisions of Earth's surface in which a standard time is kept, the primary division being that bisected by the Greenwich meridian. Each zone is 15° of longitude in width, with local variations, and observes a clock time one hour earlier than the zone immediately to the east. one of the 24 areas that the world is divided into, each of which has its own time