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www.timeanddate.com/time/time-zones-history.html

The act also established daylight saving time in the nation. Daylight saving time was repealed in 1919, but standard time in time zones remained in law, with the Interstate Commerce Commission (ICC) having the authority over time zone boundaries. Many countries started using hourly time zones by the late 1920s.

en.wikipedia.org/wiki/Time_zone

A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions instead of longitude, because it is convenient for areas in close commercial or other communication to keep the same time.

www.quora.com/Who-invented-time-zones

The first adoption of a standard time was on December 1, 1847, in Great Britain by railway companies using GMT kept by portable chronometers. The first of these companies to adopt standard time was the Great Western Railway (GWR) in November 1840....

www.answers.com/Q/Who_invented_time_zones

Canadian Sandford Fleming invented Standard Time in 1879. He proposed that the world should be divided into 24 equal Time Zones, and that the time within each zone would be the same.

www.worldtimeserver.com/learn/history-of-time-zones

Time Zones were created to synchronize time all across the world. Believe it or not, until about the 19th century there were no central time standards. Every town, city or location kept their own time and usually stayed in sync thanks to a clock tower or large clock placed somewhere accessible to all.

wanttoknowit.com/who-invented-time-zones

Who invented time zones? The first time zone was created in 1847 by the British railway companies, which was known as Railway Time. This eventually became Britain’s official time in 1880. In 1868 New Zealand adopted a standard time to be observed throughout the country and is believed to be the first country to do so.

en.wikipedia.org/wiki/History_of_time_in_the_United_States

The history of standard time in the United States began November 18, 1883, when United States and Canadian railroads instituted standard time in time zones.Before then, time of day was a local matter, and most cities and towns used some form of local solar time, maintained by some well-known clock (for example, on a church steeple or in a jeweler's window).

www.world-timezone.com/history-of-timezones

Many applied the time at a local astronomical observatory to an entire country, without any reference to GMT. It took many decades before all time on Earth was in the form of time zones referred to some “standard offset” from GMT/UTC. Most major countries had adopted hourly time zones by 1929.

greenwichmeantime.com/info/history/time-zones-history

The History of Time Zones Standard Time and Longitudes. 24 time zones and many more subdivisions Standard time is the time of a town, region or country, established by law or general usage as civil time. It is determined locally. For example, the whole of China, one of the largest countries in the world, has decided to adopt a single time zone. ...

worldhistoryproject.org/1883/11/18/time-zones-are-created

Time Zones Are Created On November 18, 1883, four standard time zones for the continental U.S.A. were introduced at the instigation of the railroads. At noon on this day the U.S. Naval Observatory changed its telegraphic signals to correspond to the change.