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Standard time zones in the United States and other regions are currently defined at the federal level by statute 15 U.S.C. § 260. The federal law also establishes the transition dates and times at which daylight saving time occurs, with federal law making its observation dependent on state or tribal law.
Date and time notation in the United States differs from that used in nearly all other countries. It is inherited from one historical branch of conventions from the United Kingdom . [ citation needed ] American styles of notation have also influenced customs of date notation in Canada , creating confusion in international commerce.
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset.
The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
The Ohio Clock in the U.S. Capitol being turned forward for the country's first daylight saving time on March 31, 1918 by the Senate sergeant at arms Charles Higgins.. Most of the United States observes daylight saving time (DST), the practice of setting the clock forward by one hour when there is longer daylight during the day, so that evenings have more daylight and mornings have less.
The US Customary system of units was developed and used in the United States after the American Revolution, based on a subset of the English units used in the Thirteen Colonies; it is the predominant system of units in the United States and in U.S. territories (except for Puerto Rico and Guam, where the metric system, which was introduced when ...
As of 2015, the Maternal mortality ratio was 46th lowest out of the countries ranked. (See Maternal mortality in the United States.). Among wealthy nations, a study on 2016 data found the United States ranked first for child deaths by automobile accident and firearm, with overall child mortality 57% higher in the U.S. than other high-income countries, although traffic deaths were decreasing.
This is a list of shopping malls in the United States and its territories that have at least 2,000,000 total square feet (190,000 m 2) of retail space (gross leasable area). The list is based on the latest self-reported figures from the mall management websites, which are also reported on each mall's individual wiki page.