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Each country sets its own time zone within this framework, so some zones extend beyond the meridian for convenience, while others, like India, take on half hours.

Kiribati even extended its time zone miles east in , to include Caroline Island in the same zone and, as it straddled the Date Line opposite the GMT meridian, the same date as the country's other islands.

The development of the world wide web in the s led to calls for a standardised internet time, as people in cyberspace were no longer bound by geography.

Swatch even invented a concept called beat time that split each day into 1, beats on a decimal system, eradicating time zones entirely. For those of you who don't operate on Internet Time, this spreadsheet shows the time zone in countries, extracted from our World Factfiles series.

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Time zones around the world, in every country There are 24 time zones around the world. Find out which one to worry about.

These chronometers were portable time standards that allowed the mariners to utilize celestial navigation to find their longitude and therefore their location.

The Isle of Man adopted the standard in , Jersey followed in , and Guernsey in This was followed by Ireland in Prior to the use of electronic time signals, the Greenwich Observatory used something called a time ball.

This time ball was a large painted sphere that was dropped at predetermined times to give ship navigators an opportunity to calibrate their chronometers at sea.

Today there are still sixty time balls to be found around the world, though most of them have been decommissioned. In fact, it is slowly down slightly, which as made solar mean time less reliable.

This issue was fixed with the invention of the atomic clock. These devices measure the energy output of electronic in an environment close to absolute zero temperatures to measure time more accurately than any other device in existence.

In , GMT was replaced with Coordinated Universal Time which was defined by a number of atomic clocks synchronized around the world. Since this change, there has been a slow movement away from the traditional standards set by GMT.

Howes in a book described this change:. Although that instrument still survives in working order, it is no longer in use and now the meridian of origin of the world's longitude and time is not strictly defined in material form but from a statistical solution resulting from observations of all time-determination stations which the BIPM takes into account when coordinating the world's time signals.

Nevertheless, the line in the old observatory's courtyard today differs no more than a few meters from that imaginary line which is now the prime meridian of the world.

Greenwich Mean Time played a major role in helping develop our most accurate methods of keeping time and of course, in developing time zones.

Display Time on your Website. Calendar Tool Meeting Planner Tool. Use the search bar above to look up by city and not by time zone. New York, NY.

Washington DC. Miami, FL. Atlanta, GA. Las Vegas, NV. Seattle, WA. Houston, TX. Boston, MA. San Francisco, CA. Chicago, IL. Los Angeles, CA.

Kuala Lumpur.