When do i set my clock back 2010

If the time is wrong after the DST change, make sure that your clock has recently received the time signal. Many radio controlled clocks have a synchronization indicator that will tell you if your clock has recently synchronized. If the clock isn't receiving the signal, click here for some tips on improving reception. If it has received the signal recently, check to make sure that the clock's time zone setting is set properly.

Also, if you live in an area where DST is not observed Arizona, for example , you need to disable the automatic DST function on your clock. Some clocks have the old date rule programmed in and do not use the part of the time code which designates whether or not daylight saving time is in effect.

These clocks will switch on the wrong date. The only way to find out is to wait and see, or to contact the manufacturer of the clock. For example, clocks manufactured prior to the rule change will probably not switch to DST in March, but will wait until April in accordance with the old rule. If you have a clock like this that fails due to the new rules, your only recourse is to adjust the clock manually, or to contact the manufacturer and ask for an upgrade or a replacement.

Physical Measurement Laboratory. Time will fall back to standard time again on Sunday, November 6, , when daylight saving time ends. The federal government doesn't require U. National surveys by Rasmussen Reports , for example, show that 83 percent of respondents knew when to move their clocks ahead in spring Twenty-seven percent, though, admitted they'd been an hour early or late at least once in their lives because they hadn't changed their clocks correctly. Ben Franklin—of "early to bed and early to rise" fame—was apparently the first person to suggest the concept of daylight savings, according to computer scientist David Prerau , author of the book Seize the Daylight: The Curious and Contentious Story of Daylight Saving Time.

While serving as U. Imagine the resources that might be saved if he and others rose before noon and burned less midnight oil, Franklin, tongue half in cheek, wrote to a newspaper. It wasn't until World War I that daylight savings were realized on a grand scale. Germany was the first state to adopt the time changes, to reduce artificial lighting and thereby save coal for the war effort. Friends and foes soon followed suit.

In the U. Between February 9, , and September 30, , the government took it a step further. During this period daylight saving time was observed year-round, essentially making it the new standard time, if only for a few years. But its beginning and end have shifted—and occasionally disappeared. During the Arab oil embargo, the U. Thirty years later the Energy Policy Act of was enacted, mandating a controversial monthlong extension of daylight saving time, starting in In recent years several studies have suggested that daylight saving time doesn't actually save energy—and might even result in a net loss.

Environmental economist Hendrik Wolff , of the University of Washington, co-authored a paper that studied Australian power-use data when parts of the country extended daylight saving time for the Sydney Olympics and others did not.

The researchers found that the practice reduced lighting and electricity consumption in the evening but increased energy use in the now dark mornings—wiping out the evening gains. Likewise, Matthew Kotchen, an economist at the University of California, saw in Indiana a situation ripe for study.

Prior to only 15 of the state's 92 counties observed daylight saving time. So when the whole state adopted daylight saving time, it became possible to compare before-and-after energy use. While use of artificial lights dropped, increased air-conditioning use more than offset any energy gains, according to the daylight saving time research Kotchen led for the National Bureau of Economic Research [PDF] in That's because the extra hour that daylight saving time adds in the evening is a hotter hour.

It is late enough to minimally affect bars and restaurants, and it prevents the day from switching to yesterday, which would be confusing. It is early enough that the entire continental U. For the U. The Navajo Nation participates in the Daylight Saving Time policy, even in Arizona, due to its large size and location in three states. Many fire departments encourage people to change the batteries in their smoke detectors when they change their clocks because Daylight Saving Time provides a convenient reminder.

More than 90 percent of homes in the United States have smoke detectors, but one-third are estimated to have dead or missing batteries. See more information about elsewhere in the world. Spring forward, Fall back During DST, clocks are turned forward an hour, effectively moving an hour of daylight from the morning to the evening.

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