![]() ![]() ![]() See also: Standard time in the United Statesīefore the adoption of four standard time zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local meridian, pre-corrected for the equation of time on the date of observation, to form local mean solar time. History Rand McNally Standard Map of the United States, 1921, showing boundaries different from today It is the combination of the time zone and daylight saving rules, along with the timekeeping services, which determines the legal civil time for any U.S. The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations. Official and highly precise timekeeping services (clocks) are provided by two federal agencies: the National Institute of Standards and Technology (NIST) (an agency of the Department of Commerce) and the United States Naval Observatory (USNO). ![]() The time zone boundaries and DST observance are regulated by the Department of Transportation, but no single map of those existed until the agency announced intentions to make one in September 2022. In military GMT is known as Zulu time.Greenwich Mean Time was the same as Universal Time (UT), until the introduction of UTC in 1972 a standard astronomical concept used in many technical fields.In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use for the most parts it is the same. Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London. Other major cities in the area are Abidjan, Dakar, Grand Dakar, Accra Principal Cities: The largest city in the GMT timezone is London from United Kingdom with population about 7.557 million people. Offset: GMT is 0 hours ahead Greenwich Mean Time (GMT) and is used in EuropeĬountries: It is used in following countries: Burkina Faso, Côte d'Ivoire, Britain (UK), Guernsey, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Ireland, Isle of Man, Iceland, Jersey, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo Offset UTC 0:00 hoursĤ:30 am 04:30 EST (Eastern Standard Time) (New York City, NY, USA). Offset UTC -5:00 hoursĩ:30 am 09:30 GMT (Greenwich Mean Time) (London, United Kingdom). Offset UTC 0:00 hoursĤ:30 am 04:30 Eastern Standard Time (EST). Greenwich Mean Time is 5 hours ahead of Eastern Standard Time and 0 hours ahead of GMT (Greenwich Mean Time) and 5 hours ahead of EST (Eastern Standard Time)ĩ:30 am 09:30 in GMT is 4:30 am 04:30 in EST and is 9:30 am 09:30 in London, United Kingdom and is 4:30 am 04:30 in New York City, NY, USAīest time for a conference call or a meeting is between 1pm-6pm in GMT which corresponds to 8am-1pm in ESTīest time for a conference call or a meeting is between 8am-6pm in GMT which corresponds to 8am-6pm in Londonīest time for a conference call or a meeting is between 1pm-6pm in GMT which corresponds to 8am-1pm in New York Cityĩ:30 am 09:30 Greenwich Mean Time (GMT). ![]()
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