Enacted by the Energy Policy Act of 2005, the changes extended the length of DST by about a month "in the interest of reducing energy consumption," the NIST says.ĭST is in effect for 238 days (around 65 percent of the year). That year the rules changed for the first time in over two decades. The rules around the DST date also sometimes change, as they did most recently in 2007. Can Daylight Saving Time Rules Change?ĭST is overseen and regulated by the U.S. also observe a period equivalent to DST but the dates for the time changes may differ from the rules in the U.S. regions that don't practice DST include Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands and most of Arizona (apart from Arizona's Navajo Indian territories, which do observe DST). The NIST notes "that same bill allows states to legislatively decide whether to practice it or not." The Uniform Time Act of 1966 dictates the rules for DST dates and all areas in the country that observe DST use the same transition days. Local jurisdictions were historically allowed to decide whether they would observe DST and when they would locally switch to DST if they're observing it. in 1918 and is observed in most of the country, apart from a few areas. Is Daylight Saving Time Observed Everywhere?ĭST was formally introduced in the U.S. "There are, however, ongoing debates about how much energy is saved," the NIST adds. Proponents feel that this saves energy because in the spring and summer months more people may be outside in the evening and not using energy at home. "This change helps keep the hours of daylight coordinated with the time that most people are active. The NIST explains DST creates "more sunlit hours" in the evening during months when the weather is the warmest. "The transition from DST to ST effectively moves one hour of daylight from the evening to the morning," says the National Institute of Standards and Technology (NIST). The clocks go back every year to set the hours back from DST to standard time (ST). Senators Come Together in Bid to Keep Daylight Saving Time Year-Round.Georgia Could Become 3rd State to Do Away With Daylight Saving Time.Daylight Savings Blues: 9 Ways to Get the Most Out of the Extra Hour.
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