element = document.getElementById( "ArizonaMin" ); Only the full-time zone names listed below are official; abbreviations are by common use conventions, and duplicated elsewhere in the world for different time zones.

// prepare for the periodic clock tick var PcStartTime = new Date();

}

The time zone that covers the most states is the Eastern Standard Time Zone (EST) How long has time zones been around? LastPcTime.setTime( CurrentPcTime.getTime() ); Baker Island and Howland Island are in UTC−12:00, while Wake Island is in UTC+12:00. window.location.href = "http://www.digital-design.com/";
if( !document.all ) // pre JavaScript 1.2 loops at 1000 ms intervals AmericanTimeZones.com shows you a map of the four main time zones

Time Zone names, codes and abbreviations for Standard Time and Daylight Saving Time (DST) around the world. Hawaii, an island state, is in the Pacific Ocean and Alaska is separated from the rest of the country by Canada. New York. Two subsequent amendments, in 1986 and 2005, have shifted these days so that daylight saving time now runs from the second Sunday in March until the first Sunday in November. The use of local solar time became increasingly awkward as railways and telecommunications improved.

element.innerHTML = Min; element.innerHTML = Min; var element = document.all.item( "PacificMin" ); element.innerHTML = Min; element = document.all.item( "CentralMin" ); As defined by U.S. law[9] they are: From east to west, the four time zones of the contiguous United States are: Some United States Minor Outlying Islands are outside the time zones defined by 15 U.S.C. The worldwide time zone system was developed in 1878. Who invented the time zone? United States Current Local Time & Date, Time Zone and Time Difference The USA is in North America, bordered to the south by Mexico and to the north by Canada. Four standard time zones for the continental United States were introduced at noon on November 18, 1883, in Chicago, IL, when the telegraph lines transmitted time signals to all major cities. Zones used in the contiguous U.S. From east to west, the four time zones of the contiguous United States are: . Welcome to American Time Zones.. AmericanTimeZones.com shows you a map of the four main time zones in the United States of America, and the current time for each time zone.. For information on how best to use this site press the button. window.onload=StartClock; 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. location at any moment. } } Countries in North America | timezones.de Asien // allow for approx transmission time over the internet (ms)

Chicago. Standard time zones in the United States and other regions are currently defined at the federal level by law 15 USC §260. element.innerHTML = Min; [2] Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals. Train drivers must recalculate their own clock in order to know departure time. The U.S. time-zone system grew from this, in which all zones referred back to GMT on the prime meridian.[1]. Past and future DST dates (2007 to 2032).

UTC is Coordinated Universal Time, GMT is Greenwich Mean Time. var ClockOffset = LocalTime.getTime() - PcStartTime.getTime(); { element = document.all.item( "IndianaMin" ); The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations. Clocks will be set ahead one hour at 2:00 a.m. on the following start dates and set back one hour at 2:00 a.m. on these ending dates: In response to the Uniform Time Act of 1966, each state has officially chosen to apply one of two rules over its entire territory: The Energy Policy Act of 2005 extended daylight saving time (DST) for an additional month beginning in 2007.
Noon occurred at different times but time differences between distant locations were barely noticeable prior to the 19th century because of long travel times and the lack of long-distance instant communications prior to the development of the telegraph. Before 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. element.innerHTML = Min;

element = document.getElementById( "MountainMin" ); Tue = Tuesday, October 20, 2020 (459 places). [5] UTC does not observe daylight saving time. // start the periodic clock tick [6] The federal law also establishes the transition dates and times at which daylight saving time occurs, if observed. LocalTime.setTime( LocalTime.getTime() + 250 ); The development of transport and communication at the end of the 1820s necessitated the introduction of a uniform time reference for the whole earth: 24 time zones were designated. Boston.

}

North America Time Zones North America, with an area of 24.93 million square kilometers, is the world's third-largest continent and includes Greenland, Mexico, the United States, Canada, and several Caribbean Island Nations. Most use the standard time for their zone (or zones, where a state is divided between two zones), except for using daylight saving time during the summer months.

(Note: in 2007, Daylight Saving Time was extended one month and a new rule started being implemented).

else if( document.all )

If Greenland and Hawaii are included in the description of North American time zones then the time zones span from UTC + 0 in Danmarkshavn Greenland to UTC -10 in Hawaii.

Min = "0" + Min; [8] Prior to this they were based upon the mean solar time at several meridians 15° apart west of Greenwich (GMT). ClockTick(); For most purposes, UTC is considered interchangeable with GMT, but GMT is no longer precisely defined by the scientific community. // start the clock once the page has finished loading In 1960, the International Radio Consultative Committee formalized the concept of Coordinated Universal Time (UTC), which became the new international civil time standard. There are six different time zones including Alaska and Hawaii.

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