![]() ![]() When you see your time zone map, there are white and gray stripes on them representing time zone borders. One hour time difference indicates solar meantime, and it is 15 longitudinal degrees wide. However, throughout the year the USA uses pacific standard time with an offset of UTC-8. For instance, the United States uses Pacific daylight time during daylight saving time period with UTC-7. In this case, there is a 1-hour extension in the local time. With the time zone name, “Daylight Saving Time” or “Summer” are also included. The time and name of time zones changes during Daylight Saving Time. The reason why we use DST is to get some extra hours of daylight. Daylight Saving Timeĭaylight Saving Time or DST is a practice of setting the time one-hour forwards in summers and moving it back in winters. There are some time zones only 30 to 45 minutes apart it has further increased the number of time zones. Now, there are 3 more time zones added to the list by International Date Line (IDL). 24 Time Zonesīased on 15-degree longitudinal time zone calculations, every time zone is 1 hour apart, so there should be 24 time zones worldwide. Based on these numbers, there are a total of 24 sections of time zones, and every time zone is 15-degree longitude. To complete its full rotation of 360 degrees, it took 24 hours. Every 60 minutes, our planet Earth moves 15 degrees on its axis. It is something related to the rotation of Earth. Things You Need to Know About Time Zones Why is the Time Zone 15-degree longitude? For instance, the easternmost time zone is 12 hours behind UTC, and the westernmost time zone is 12 hours above UTC, so it uses UTC-12 and UTC+12 tags accordingly. With Greenwich meridian, UTC uses negative and positive to show time zone offsets from UTC. It compensates for the slowing rotation of Earth by adding leap seconds to days regularly. UTC is a variant of Greenwich mean time at zero-degree longitude. ![]() What is Co-ordinated Universal Time (UTC)? This article discusses different time zones, and how to calculate time zones. If it is the first time you have ever come across the concept of time zones, it might take you some time to understand how it is measured and why the world has different time zones ranging from UTC-12 to UTC+12. To order the date and time globally, we follow Co-ordinated Universal Time (UTC). According to some astrologers, the observance of stars crossing the meridian would tell a more accurate time than the observance of sun positions. Based on the Earth’s rotation, astrologers observe celestial bodies crossing the meridian to measure the time. Days are split into seconds and calculated to evaluate the exact time of a particular place. There are 24 time zones worldwide, as each time zone has a one-hour difference. In 1878, Sir Sandford Fleming introduced the idea of time zones, and it was first used by America’s railroads in 1883. It depends on the geographical area a country is covering, and countries also have offshore territories. Even the countries that are so big follow 11 different time zones, and others use just one. Based on the distance and location, countries follow different time zones, some countries have only a few minutes offset, and some are a day apart. We know that the clocks in America, China, and Bangladesh show totally different times. When daylight saving is active, the time in Phoenix (Mountain Standard Time) and San Diego (Pacific Daylight Time) is the same, and both are one hour behind Denver (Mountain Daylight Time).What are Different Time Zones? | How is Time Calculated Worldwide? The Hopi Reservation, which is not part of the Navajo Nation but is geographically surrounded by it, does not observe DST.Įxample:- When daylight saving is not active, the time in Phoenix and Denver is the same (Mountain Standard Time), and both are one hour ahead of San Diego (Pacific Standard Time). Unlike most of the United States, Arizona does not observe daylight saving time (DST), with the exception of the Navajo Nation, which does observe DST. Thus, during daylight saving time, from March to November, most of Arizona has the same time as the Pacific Time Zone. Arizona is in the Mountain Time Zone and most of the state (with exceptions noted below) remains in Mountain Standard Time (MST) all year. In the Greater Phoenix area we never change our clocks, since Arizona does not participate in Daylight Saving Time. Phoenix, Arizona's time zone is Mountain Standard Time (MST). ![]()
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