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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 Daylight saving time was repealed in 1919, but standard time in time zones remained in law, with the Interstate Commerce Commission (ICC) having the authority over time zone boundaries.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 because it is convenient for areas in close commercial or other communication to keep the same time.

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

In 1884, a conference decided that the time in Greenwich, England, would be the basis for setting all the other time zones. We still use Fleming’s system of standardized time zones today. Source: Who Invented The Worldwide System of Standard Time Zones

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.

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.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.

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.

www.thecanadianencyclopedia.ca/en/article/invention-of...

Fleming instigated the initial efforts that led to the adoption of the time zones used by the railways in 1883 and the global time zones we use today. Fleming advocated dividing the world into 24 time zones, each equal to 15o of longitude and to one hour, beginning at the Greenwich Meridian (0o longitude).

www.webexhibits.org/daylightsaving/d.html

Standard time in the US. Standard time in time zones was instituted in the U.S. and Canada by the railroads on November 18, 1883. Prior to that, time of day was a local matter, and most cities and towns used some form of local solar time, maintained by a well-known clock (on a church steeple, for example, or in a jeweler's window).

en.wikipedia.org/wiki/Sandford_Fleming

Sir Sandford Fleming KCMG (January 7, 1827 – July 22, 1915) was a Scottish Canadian engineer and inventor.Born and raised in Scotland, he emigrated to colonial Canada at the age of 18. He promoted worldwide standard time zones, a prime meridian, and use of the 24-hour clock as key elements to communicating the accurate time, all of which influenced the creation of Coordinated Universal Time.