Who Decides On the Time Zones?

February 25, 2016

time clocksEverything in life is dictated by time, and depending on where you live, your time is different than someone somewhere else. This hasn’t always been the case, and how is it decided how our time is divided up?

The origins of time zones can be traced to one particular change in transportation–the railroads. In the late 1800s, when trains became the preferred means of travel across the U.S., a problem surfaced. Passengers needed to catch their train at a particular time in their part of the country, and trains needed a set time to know so they wouldn’t crash into each other.

Towns usually set their local time by the movement of the sun, so when trains began to cut the travel time between these towns, the time between these areas was vastly different. The railroads had to have different arrival and departure times for different trains depending on the local time where the train was coming or going. It became a scheduling mess, and a better way was needed.

The railroads were the first to develop their own time zone system in 1883 instead of relying on the federal government. They established four zones across the country, the Eastern, Central, Western, and Pacific, and they are closely aligned with the zones we have today. It wasn’t until 1918 that the time zones became official under the Standard Time Act. This was also when daylight savings time was established.

A year after the railroads set their time zones, delegates from 25 countries met in Washington D.C. to establish times zones around the world and across different countries. They set the standard starting point (the prime meridian) at the Royal Observatory in Greenwich, England. With each 15 degrees longitude change, the time changed by one hour. Going east an hour was gained, and by traveling west an hour was decreased. The result was 24 time zones that covered the entire world.

The choice as Greenwich being chosen the prime meridian was because of its popularity, even though other longitude reference points were being used by other countries. The observatory had a record of accurate and reliable navigation data used in the shipping industry, and Britain had more ships and shipping traffic than the rest of the world combined at the time. It wasn’t completely adopted by every country right away, however. The French used Paris as their prime meridian until 1911.

world time zone mapSo who ultimately decides what the time zones are? It’s actually decided by individual countries. While many countries adopted the hourly time zones, there were still many variations as different nations decided on half or quarter hour deviations from those zones.

Many countries have changed their time zones to fit their needs. In 1949, China’s communist government moved the country’s five time zones into one. The time for the entire country was based on the time in Beijing, and the reason was based on national unity. There are other oddities with time zones around the world. In the summer, Australia has not only vertical time zones like we are familiar with, but horizontal ones as well, and Russia actually covers twelve time zones but only recognizes nine of them.

The map of the time zones shows that they are far from uniform, and this doesn’t include the many strange time zones that crop up because of daylight savings time. This would require a completely separate discussion.

About the author 

Daniel Ganninger - The writer, editor, and chief lackey of Knowledge Stew, the author of the Knowledge Stew line of great trivia books, and editor of Fact World and the Knowledge Stew sister site on Medium. I hope you find things here to annoy those around you with your new found knowledge.

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