Hawaii – Aleutian standard time (HAST) (UTC-10).Standard time zones in the united states and other regions are currently defined at the federal level by law 15 USC 260. The US TIME ZONE MAP is divided into 9 categories: WHAT ARE THE DIFFERENT TIME ZONES IN THE UNITED STATES? The offset from the world’s standard time expressed as UTC- /UTC+ defines the local time within a time zone.Time zones are crucial for standardizing time across countries and regions. You can see the all-time zones in this printable timezone map of USA. All these zones are defined by an offset from the coordinated universal time by a number of hours centered on the prime meridian. In each geographic region within a time zone, people use the same time. Each section observes a uniform standard time to keep track of the day and night cycle and also for legal, social and commercial purposes. Printable Map of US Time ZonesĪ time zone is one of 24 spherical lunes with equal width-each assigned with one of the 24 hours. Noon occurred at different times but the time differences between distant locations were barely noticeable prior to the 19 th century because of long travel times and the lack of long-distance instant communication prior to the development of the telegraph. Explore the dataĬurious about America’s time zones? The National Transportation Atlas Database provides a digital representation of the geographic boundaries for the nine time zones that cover United States and its territories.Before the adoption of four standard time zones for the continental United States, many towns and cities set their clock 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. National Council of State Legislatures map shows States with legislative activity to adopt year-round DST. Some States have enacted legislation to adopt DST as their permanent setting, pending federal approval. States can opt-out from DST, but such an exemption must apply to the entire portion of that State that lies in a given time zone (some states, like North Dakota, straddle two different zones). Currently, DST begins the second Sunday in March and ends the first Sunday in November. Congress has amended time change laws several times since then. The Standard Time Act of 1918, “an Act to save daylight and to provide standard time for the United States,” authorized the nation’s first “Daylight Saving Time” to begin on the last Sunday of March and conclude on the last Sunday of October. time zones as recorded in the National Transportation Atlas Database Daylight Saving Time rules begin in 1918 but have changed through the years Department of Transportation to change their time zone.Ĭurrent U.S. The early maps had today’s four time zones for the coterminous states, but the boundaries were very different from today. Time zone map of the United States from 1913, as published in the Chicago Daily News Almanac and Yearbook. British railroads were the first to adopt standard time in 1840, and railroads in the US and Canada adopted standard time zones in 1883. Thank the railroads for our standard time zonesīefore time zones were created, each locality set its own clocks to noon at the time of day when the sun was at its highest position. Virgin Islands) don’t practice the spring and autumn time change. territories (American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and the U.S. Some states (Hawaii, Arizona-except for the Navajo Nation within the state) and U.S. Last weekend, millions of Americans turned back their clocks one hour to mark the return from Daylight Saving Time to Standard Time. Advisory Council on Transportation Statistics.National Transportation Knowledge Network.National Transportation Library Main - Library.Vehicle Inventory and Use Survey (VIUS).Transportation Statistics Annual Reports.Local Area Transportation Characteristics (LATCH dataset).Government Transportation Financial Statistics.Freight Logistics Optimization Works (FLOW).Electric Vehicle Inventory and Use Survey (eVIUS).Statistical Products and Data Main - Statistical 1.Transportation Maps and Geospatial Data.Introduction to Transportation Statistics.
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