What time zone is Valley, Alabama? Valley, Alabama is located in the Central Time Zone, which means that the time is Central Standard Time (CST) during regular time and Central Daylight Time (CDT) when daylight savings is in effect. The North American Central Time Zone (CT) is a time zone in parts of Canada, the United States, Mexico, Central America, some Caribbean Islands, and part of the Eastern Pacific Ocean.
This article needs additional citations for. Unsourced material may be challenged and removed.Find sources: – ( March 2013) Time in the United States, by law, is divided into nine standard covering the states, territories and other US possessions, with most of the observing (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the. Official and highly precise timekeeping services (clocks) are provided by two federal agencies: the (NIST) (an agency of the ); and the (USNO). The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations.It is the combination of the time zone and daylight saving rules, along with the timekeeping services, which determines the legal for any U.S.
Location at any moment. 1913 time zone map of the United States, showing boundaries different from todayBefore the adoption of four zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local, pre-corrected for the on the date of observation, to form. 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.The use of became increasingly awkward as railways and telecommunications improved. American railroads maintained many different time zones during the late 1800s. Each train station set its own clock making it difficult to coordinate train schedules and confusing passengers. Time calculation became a serious problem for people traveling by train (sometimes hundreds of miles in a day), according to the Library of Congress. Every city in the United States used a different time standard so there were more than 300 local sun times to choose from.
Time zones were therefore a compromise, relaxing the complex geographic dependence while still allowing local time to be approximate with mean solar time. Railroad managers tried to address the problem by establishing 100 railroad time zones, but this was only a partial solution to the problem.Weather service chief had needed to introduce four standard time zones for his weather stations, an idea which he offered to the railroads. Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals. Four standard time zones for the continental United States were introduced at noon on November 18, 1883, when the telegraph lines transmitted time signals to all major cities.In October 1884, the at Washington DC adopted a proposal which stated that the prime meridian for longitude and timekeeping should be one that passes through the centre of the transit instrument at the in the United Kingdom (UK). The conference therefore established the as the prime meridian and (GMT) as the world's time standard.
Time-zone system grew from this, in which all zones referred back to GMT on the prime meridian. From GMT to UTC In 1960, the International Radio Consultative Committee formalized the concept of, which became the new international civil time standard. UTC is, within about 1 second, mean solar time at 0°. UTC does not observe daylight saving time.For most purposes, UTC is considered interchangeable with GMT, but GMT is no longer precisely defined by the scientific community. UTC is one of several closely related successors to GMT.United States time zones Standard time zones in the United States are currently defined at the federal level by law §260.
The federal law also establishes the transition dates and times at which occurs, if observed. It is ultimately the authority of the, in coordination with the states, to determine which regions will observe which of the standard time zones and if they will observe daylight saving time. As of August 9, 2007, the standard time zones are defined in terms of hourly offsets from. Prior to this they were based upon the at several meridians 15° apart west of.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.The United States uses nine standard time zones. As defined by U.S. Law they are:Time ZoneDSTStandard(not observed),; Partially:,; No DST observed, not defined by 15 U.S.C.
§260:,; Partially:,(no DST outside of ),; Partially:,; Partially:,Partially:(no DST observed in Hawaii); Partially:; No DST observed, not defined by 15 U.S.C. §260:(not observed); Not defined by 15 U.S.C. §260:,(not observed)Not defined by 15 U.S.C. §260:,(not observed)Not defined by 15 U.S.C. §260:(not observed),Zones used in the contiguous U.S. From east to west, the four time zones of the are:. (Zone R), which comprises roughly the states on the and the eastern two thirds of the.
(Zone S), which comprises roughly the, and most of the. (Zone T), which comprises roughly the states and portions of states that include the and the western quarter of the Great Plains.
(Zone U), which comprises roughly the states on the, plus and the.Zones used in states beyond the contiguous U.S. (; Zone V), which comprises most of the state of. (no daylight saving in Hawaii,; zone W), which includes and most of the length of the chain (west of 169°30′W).Zones used in U.S. Territories. (; Zone X), which comprises. (; Zone K), which comprises and the. (; Zone Q), which comprises and the.Minor Outlying Islands Some are outside the time zones defined by 15 U.S.C.
§260 and exist in waters defined. In practice, military crews may simply use when on these islands. And are in, while is in. Because they exist on opposite sides of the, it can, for example, be noon Thursday on Baker and Howland islands while simultaneously being noon Friday on Wake Island. Other outlying islands include, and ; ; and, and.Antarctic research stations. : red and pink areas belong to the central time zone.
roughly follows the border between (to the south and west) and the (U.P.) of (to the north and east); the Upper Peninsula counties that border Wisconsin (namely, and counties) observe central time, all other counties in the U.P. Main article:Daylight saving time (DST) begins on the second Sunday of March and ends on the first Sunday of November.Clocks will be set ahead one hour at 2:00 AM on the following start dates and set back one hour at 2:00 AM on these ending dates:YearStartEnd2019Mar 10Nov 32020Mar 8Nov 1In response to the of 1966, each state has officially chosen to apply one of two rules over its entire territory:. 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. Originally this ran from the last Sunday in April until the last Sunday in October.
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. Arizona time zones. and use standard time throughout the year. However:. The observes DST throughout its entire territory, including the portion that lies in Arizona.
But the, which is by the Navajo Nation and is entirely in Arizona, does not observe DST. (See map inset right.). In 2005, Indiana passed legislation which took effect on April 2, 2006, that placed the entire state on daylight saving time (see ). Before then, officially used standard time year-round, with the following exceptions:. The portions of Indiana that were on central time observed daylight saving time.
Also, some Indiana counties near and were on eastern time (ET), but did (unofficially) observe DST.The extended for an additional month beginning in 2007.Previous DST change dates include:YearStartEnd2006Apr 2Oct 292007Mar 11Nov 42008Mar 9Nov 22009Mar 8Nov 12010Mar 14Nov 72011Mar 13Nov 62012Mar 11Nov 42013Mar 10Nov 32014Mar 9Nov 22015Mar 8Nov 12016Mar 13Nov 62017Mar 12Nov 52018Mar 11Nov 4See also.References.
Regions in the Central Time Zone prior to 2015 ( is now in the )UTC offsetCSTCDTCurrent time06:31, 31 August 2019 Observance of DSTDST is observed in some of this time zone.The North American Central Time Zone ( CT) is a in parts of, the, some, and part of the.Central Standard Time (CST) is behind (UTC). During summer most of the zone uses (DST), and changes to Central Daylight Time (CDT) which is behind UTC.The largest city in the Central Time Zone is; the is the largest metropolitan area in the zone and North America. Main article:The province of is the only in that observes Central Time in all areas.The following Canadian provinces and territories observe Central Time in the areas noted, while their other areas observe:. (territory): western areas (most of and part of ). (province): a portion of the northwest bordering southeastern Manitoba, in and around.Also, most of the province of is on Central Standard Time year-round, never adjusting for Daylight Saving Time. Major exceptions include, a city situated on the boundary between and Saskatchewan. The city charter stipulates that it shall observe Mountain Time and DST, putting the community on the same time as all of Alberta, including the major cities of.
As a result, during the summer, clocks in the entire province match those in Alberta, but during the winter, clocks in most of the province match those in Manitoba.United States. Main article:Nine states are contained entirely in the Central Time Zone:.Note: Although all of is legally on Central Time, and the nearby community of unofficially observe Eastern Time, as these areas are part of the metropolitan area of the considerably larger city of in the Eastern Time Zone.
– except for the, in which the inner islands use Mountain Time and the outer island uses Pacific Time. –.only the municipality of, rest of the state uses Mountain Time.Central America , and all use Central Standard Time year-round.Eastern Pacific islands and other areas The in uses Central Standard Time all year-round; the remainder of Ecuador uses Eastern Standard Time. Both and in uses Central Standard Time during the Southern Hemisphere winter and Central Daylight Time during the Southern Hemisphere summer; the remainder of Chile uses Atlantic Standard Time and Atlantic Daylight Time.Central Daylight Time (DST) is in effect in much of the Central time zone between mid-March and early November. The modified time is called 'Central Daylight Time' (CDT) and is. In Canada, Saskatchewan does not observe a time change. One reason for Saskatchewan's lack of a time change is that, geographically, the entire province is closer to the Mountain Time Zone's meridian. The province elected to move onto 'permanent' daylight saving by being part of the Central Time Zone.
The only exception is the region immediately surrounding the Saskatchewan side of the biprovincial city of, which has chosen to use Mountain Time with DST, synchronizing its clocks with those of.In those areas of the Canadian and American time zones that observe DST, beginning in 2007, the local time changes at 02:00 local standard time to 03:00 local daylight time on the second Sunday in March and returns at 02:00 local daylight time to 01:00 local standard time on the first Sunday in November. Mexico decided not to go along with and observes their from the first Sunday in April to the last Sunday in October. In December 2009, the Mexican Congress allowed ten border cities, eight of which are in states that observe Central Time, to adopt the U.S. Daylight time schedule effective in 2010.Alphabetical list of major Central Time Zone metropolitan areas.