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What Time Is It

March 11, 2012 by · Comments Off on What Time Is It 

What Time Is It, Daylight saving time doesn’t save energy — quite the opposite. Back in World War I, when Germany, Russia, and England first adopted daylight saving, the idea was to conserve coal for the war effort. (The United States eventually followed suit in 1918.) If these countries could just stretch out the daylight during the summer, leaders reasoned, then people would use less electricity for lighting. Sounds sensible, right? The problem is that daylight saving no longer seems to be effective on this score.

Here’s a raft of studies on the subject. Most of them find that while households do use less lighting during daylight saving, thanks to the longer, brighter afternoons, they also end up cranking up the air conditioning more, which makes it either a wash or a net loser for energy use. A 2008 paper (pdf) by economists Matthew Kotchen and Laura Grant examined what happened in Indiana when, thanks to a change in state law, all counties suddenly had to shift to daylight saving. They concluded that daylight saving probably costs Indiana about $10.7 million to $14.5 million per year in higher electricity bills and increased coal pollution.

Meanwhile, daylight saving doesn’t seem to impact gasoline use and driving habits one way or the other. Back in 2005, Congress decided to extend daylight saving by four weeks, claiming it would reduce oil use by 1 percent. A subsequent review (pdf) in 2008 by the Department of Energy found that the legislation didn’t appear to have any effect on gasoline consumption at all.

2) Daylight saving time might increase traffic fatalities. There’s also some dispute about whether daylight saving time increases or decreases traffic accidents. On the one hand, the extra hour of sunshine in the afternoon means that more people are driving while it’s still light out. That makes the roads safer, according to a 1995 study (pdf) in the American Journal of Public Health. On the other hand, the sleep disruptions that occur when clocks are moved forward can increase the risk of traffic fatalities during the spring. Back in 1996, researcher Stanley Coren found that traffic accidents flare up in the spring, when we set our clocks forward and everybody’s tired, and drop again in the fall, when we set our clocks back and get an extra hour of sleep.

3) Daylight saving can be bad for your health. Again, some mixed results here. The extra sunlight is good for vitamin D synthesis. But the disruption in sleep patterns caused by setting your clock forward can actually kill people. Here’s the finding reported in a brand new study out of the University of Alabama in Birmingham: “The Monday and Tuesday after moving the clocks ahead one hour in March is associated with a 10 percent increase in the risk of having a heart attack,” says researcher Martin Young. And a 2009 study (pdf) in the Journal of Applied Psychology found that tired workers are at greater risk of workplace accidents.

4) Daylight saving has mixed effects on the economy. Retailers love the extra sunlight — it means that there are more customers around who are willing to go out and shop. The all-powerful golfing industry is also a big fan, apparently. On the other hand, daylight saving can cut into sales for movie theaters and reduce the audience for prime-time television — people go out and enjoy the evening air instead of staring at screens inside.

What Time Is It?

November 6, 2011 by · Comments Off on What Time Is It? 

What Time Is It?, When you turned back by one hour your clocks, watches, microwaves and thermostats this morning, most of the nation did the same. It wasn’t always so simple.

In fact, for decades, the fight over “fast time,” “summer time,” “Wilson time,” “war time,” “Bolshevik time” or “standard time,” “slow time,” “God’s time” — the varied names for it depended on how you viewed the issue — roiled Congress, the state legislatures and city councils. The result was a confounding patchwork of conflicting times.

Though the original arguments for daylight saving time centered around saving energy during wartime, it quickly became a pitched battle between urban lifestyle vs. rural realities. City office workers liked getting an extra hour of sunlight during the summer to enjoy the lakefront, attend a baseball game, go golfing or spend time with the family. But farmers argued they couldn’t shift their work so easily. They couldn’t work as efficiently in the dew-laden fields in the early morning, but hired hands wanted to be home at the new dinner time to be with families. The shift effectively shortened the working day. The dairy men reported that the milk truck arrived to pick up the morning’s production an hour too early: the cows simply wouldn’t produce. If those cityfolk want to enjoy more daylight, they argued, why do they need to mess with “God’s time”? Just get out of bed when you needed to and leave “sun time” alone.

The nation rallied around President Woodrow Wilson’s appeal to patriotism, though, and daylight saving time was adopted nationwide in 1918. From the beginning, though, exceptions popped up. The first year, it fell on Easter Sunday. Lest the faithful miss the most important Mass of the year, the Archdiocese of Chicago decreed Mass schedules would remain on standard time that day, even as the rest of the nation switched.

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