![]() ![]() Every place on Earth is measured either in degrees east or degrees west of this line. The Meridian, after which GMT is named, is used to represent 0 degrees longitude (although it is not truly 0 degrees). In 1847, the British railroads accepted GMT as a standard. ![]() GMT was the same as Universal Time up until 1972. To calculate the time zone an area theoretically falls in, the measurement of the area’s longitudinal coordinate is divided by 15. This means that, in the spring, a clock will go from 4:00 Standard Time to 5:00 DST. World Clocks are adjusted forward by one hour in the early spring and then set back by one hour in the autumn. Therefore, for half of the year some countries adjust their clocks by one hour. For instance, Saudi Arabia, which is 3 hours ahead of the UK, has a time zone of “GMT +3” and Colombia, which is 5 hours behind the UK, has a time zone of “GMT -5”.ĭaylight Savings Time (DST) is practiced in certain parts of the world in order to allow for more hours of daylight during the working day. The UK sets the standard for Greenwich Mean Time at “ GMT 0” and other countries can calculate their time zone in accordance with how many hours they are ahead of or behind the UK. There are 24 different time zones on earth to correlate with the 24 hours in each day and which are displayed in our time zone map here at World Clock. Time zones are regions of the earth divided by lines of longitude. However, there is no actual time difference between GMT and UTC and therefore the two can be used interchangeably. There are two standards by which a country’s time zone is categorized the older of the two standards is Greenwich Mean Time (GMT) and the more modern of the two standards is Coordinated Universal Time ( UTC). Whether you’re looking to book a flight, schedule an international teleconference, use our time zone converter or our time zone map and observe the trading hours of an overseas business, can show you the time in a matter of seconds. With incomparable time-telling precision, World Clock is the perfect point of reference for travelers and business people alike. These calculations become more complicated near a daylight saving boundary (because the UTC offset for zone X is a function of the UTC time). provides accurate world time, statistics and weather in major cities across the world. The conversion equation can be rearranged to “time in zone B” = “time in zone A” − “UTC offset for zone A” + “UTC offset for zone B”.įor example, what time is it in Los Angeles (UTC offset= −08) when the New York Stock Exchange opens at 09:30 (−05)? time in Los Angeles = 09:30 − (−05:00) + (−08:00) = 06:30. (The more familiar term “UTC offset” is used here rather than the term “zone designator” used by the standard.) In which each side of the equation is equivalent to UTC. How to convert timeĬonversion between time zones obeys the relationship “time in zone A” − “UTC offset for zone A” = “time in zone B” − “UTC offset for zone B”, They are also helpful in tracking the time of day in different parts of the world and keeping track of the time difference between the two locations. Time zone conversions are essential for various purposes, including scheduling meetings, making travel plans, and coordinating activities with people in different time zones. There are also several online tools and resources available that can help you perform time zone conversions with ease. Time zone conversions can be done manually using a time zone converter or a world clock, or they can be done automatically using a computer or smartphone. To determine the time in Chicago, you would need to convert the time in New York to the equivalent time in the Central Standard Time zone. In that case, it will be 11:00 am in Chicago ( Central Standard Time), which is in time zone UTC-06:00. Time zone conversions are necessary because the Earth is divided into a number of different time zones, and the time in one time zone may not be the same as the time in another time zone.įor example, suppose it is 12:00 noon in New York ( Eastern Standard Time), which is in time zone UTC-05:00. Time zone conversions are used to convert the time in one time zone to the equivalent time in another time zone. ![]()
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