How To Set Time Zone In Mysql
If yous board a plane in New York at three p.m. and head west, you land in San Francisco at six:xl p.m. despite the fact that you were in the air for virtually seven hours. Equally you crossed the country, yous went back in time—or so it seems. In a manner you did. During your flight, you went from once zone into another. To understand how this works, y'all need to know how to convert betwixt time zones.
Agreement Time Zones
When people talk nearly time zones, they're referring to the way people adjust the clock as they motility toward or away from Coordinated Universal Time (UTC). Time advances one hr for every xv degrees e you move from the Prime Meridian in Greenwich, London. Each one 60 minutes increment represents a time zone. When y'all arrived in San Francisco at six:xl p.m., it was also nine:40 p.m. on the New York time clock.
Time zones are a relatively recent invention. People used to tell time past the position of the sun. Each community set the official clock at noon when the sun reached its highest spot in the sky. Equally a result, apex in Washington, D.C. took place before noon in Chicago.
When people started using the railroad to travel and transport appurtenances across the The 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, mountain and pacific. Within each region, all the clocks displayed the same time.
Universal Coordinated Fourth dimension
In 1884, representatives from select countries met at the International Acme 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 Acme. 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 Mean Time (GMT) interchangeably, but they are not exactly the aforementioned. UTC is the time standard. GMT is a fourth dimension zone that includes parts of Europe and Africa.
How Many Time Zones Are in the Earth?
Since there are 24 hours in a mean solar day, it makes sense to have 24 time zones in the earth. There are, however, more than 30 time zones beyond the globe. Some of these time zones have increments of 30 minutes or 45 minutes, simply most of them correspond 1 hour.
Time zones don't follow a straight line from northward to s. In some countries, the time zone border follows the country'due south political border. Other countries, like Prc, have only one time zone. If you wait at a map of the world's time zones, yous run across jagged lines where they adjust to adjust these countries.
Computing Time Differences
Calculating time differences is fairly elementary and requires basic addition and subtraction. You lot add as you move due east and subtract every bit you movement west. Eastern Standard Time is five time zones w of Greenwich Mean Fourth dimension, so you lot decrease 5 hours from UTC to determine the fourth dimension in New York. Nihon Standard Time is nine time zones due east of Greenwich Mean Time, and then you add together nine hours to UTC to summate the time in Tokyo.
For example, if yous're in Los Angeles and want to know what time information technology is in Paris, you lot count the number of time zones between the two cities. At that place are nine time zones between them. When it's 1:00 p.m. in Los Angeles, it'southward 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 up with a programme to alter time on the clock and move information technology ahead i hour in the summer. This gave him an extra hour of natural lite in the evening, so he wasted less fuel on lighting. More 100 years later on, the United States adopted Daylight Saving Time as a way to conserve free energy during Globe War I.
The United States isn't the only country to observe Daylight Saving Time. Most countries in Due north America, Europe and parts of South America and Australia switch to a form of Daylight Saving Time during the summer. This also makes it more difficult to convert betwixt fourth dimension zones, so many people use a fourth dimension zone calculator when they demand to know what fourth dimension information technology is in some other part of the globe.
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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