But it is a time zone away in terms of security.

For the whole world, 40 such time zones are now in use.

During summer these states are in two different time zones.

These time zones have much greater effect than people think.

In that case the world could have been a single time zone.

There is just one time zone in China despite its great size.

There is no reason at all why a nation should have the same time zone.

Their flight had taken them into the next time zone.

That is why his story needs to be told in two time zones.

Although the country is 2,400 miles wide, China has only one official time zone.