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If you board a aeroplane in New York at 3 p.m. and head west, y'all land in San Francisco at vi:40 p.g. despite the fact that you were in the air for almost vii hours. As you crossed the country, y'all went back in time—or so it seems. In a way you did. During your flying, you went from one time zone into another. To sympathize how this works, you demand to know how to convert between fourth dimension zones.
Agreement Fourth dimension Zones
When people talk most time zones, they're referring to the fashion people conform the clock as they move toward or away from Coordinated Universal Time (UTC). Time advances one hour for every 15 degrees east you motility from the Prime Meridian in Greenwich, London. Each one 60 minutes increment represents a fourth dimension zone. When you arrived in San Francisco at 6:xl p.g., it was also ix:forty p.m. on the New York time clock.
Time zones are a relatively recent invention. People used to tell time by the position of the sun. Each community set the official clock at noon when the dominicus reached its highest spot in the sky. Every bit a result, noon in Washington, D.C. took place earlier noon in Chicago.
When people started using the railroad to travel and transport appurtenances beyond the United states, they found local times disruptive. It was difficult to coordinate train schedules. The solution was to divide the country into four time zones: eastern, key, mount and pacific. Within each region, all the clocks displayed the same fourth dimension.
Universal Coordinated Time
In 1884, representatives from select countries met at the International Meridian Conference in Washington, D.C. During the conference, the members decided to designate the line of longitude that passes through Greenwich, England, as the Prime Meridian. This imaginary line became the standard for Coordinated Universal Time (UTC).
The world uses UTC to regulate clocks. Some people use the terms Coordinated Universal Time and Greenwich Hateful Time (GMT) interchangeably, but they are not exactly the same. UTC is the time standard. GMT is a time zone that includes parts of Europe and Africa.
How Many Time Zones Are in the Globe?
Since at that place are 24 hours in a day, information technology makes sense to have 24 time zones in the world. In that location are, however, more than than xxx time zones across the globe. Some of these time zones have increments of 30 minutes or 45 minutes, but most of them stand for one hr.
Time zones don't follow a straight line from north to due south. In some countries, the time zone edge follows the land's political border. Other countries, like China, accept only one fourth dimension zone. If yous look at a map of the globe's time zones, y'all see jagged lines where they adjust to arrange these countries.
Calculating Time Differences
Calculating time differences is fairly simple and requires basic addition and subtraction. You add every bit you move east and subtract as you movement west. Eastern Standard Fourth dimension is five time zones w of Greenwich Mean Fourth dimension, so you subtract five hours from UTC to determine the time in New York. Japan Standard Time is ix fourth dimension zones east of Greenwich Mean Time, so you add ix hours to UTC to calculate the time in Tokyo.
For instance, if you're in Los Angeles and want to know what time it is in Paris, y'all count the number of time zones between the ii cities. There are nine fourth dimension zones between them. When it's one:00 p.yard. in Los Angeles, it's ten:00 p.m. in Paris. The exception to this is a time zone with a 30- or 45-minute increment.
Daylight Saving vs. Standard Time
Benjamin Franklin came upwards with a programme to change fourth dimension on the clock and move it ahead one hour in the summer. This gave him an actress hour of natural lite in the evening, and then he wasted less fuel on lighting. More 100 years afterward, the United States adopted Daylight Saving Time every bit a way to conserve energy during World War I.
The The states isn't the only land to notice Daylight Saving Time. Most countries in North America, Europe and parts of S America and Commonwealth of australia switch to a form of Daylight Saving Time during the summer. This also makes information technology more difficult to catechumen between time zones, so many people employ a time zone calculator when they need to know what fourth dimension it is in another part of the earth.
Source: https://www.questionsanswered.net/travel/how-to-convert-times-between-time-zones?utm_content=params%3Ao%3D740012%26ad%3DdirN%26qo%3DserpIndex
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