desflood
07-27-2005, 04:54 PM
House, Senate OK Daylight-Saving Extension Thu Jul 21,10:15 PM ET
WASHINGTON - An agreement was reached Thursday to extend daylight-saving time in an effort to conserve energy, but not to the extent the House approved in April.
House and Senate negotiators on an energy bill agreed to begin daylight-saving time three weeks earlier, on the second Sunday in March, and extend it by one week to the first Sunday in November. The House bill would have added a month in the spring and another in the fall.
According to some senators, farmers complained that a two-month extension could adversely affect livestock, and airline officials said it would have complicated scheduling of international flights.
"We ought to take a hard look at this before we jump into it," said Sen. Larry Craig (news, bio, voting record), R-Idaho, who questioned how much oil savings the extension would produce.
Reps. Edward Markey, D-Mass., and Fred Upton, R-Mich., agreed to scale back their original proposal, and Senate negotiators accepted the new version, along with a call for a new study on how much daylight-saving time actually affects oil consumption.
"The beauty of daylight-saving time is that it just makes everyone feel sunnier," said Markey.
Upton noted that the extension means daylight-saving time will continue through Halloween, adding to safety. "Kids across the nation will soon rejoice," said Upton, because they'll have another hour of daylight trick-or-treating.
Lawmakers said they hoped to complete the energy legislation next week.
Ginofan
07-27-2005, 06:09 PM
http://www.timeanddate.com/time/aboutdst.html
Daylight Saving Time (or Summer Time as it is called in many countries) is a way of getting more out of the summer days by advancing the clocks by one hour during the summer. Then, the sun will appear to rise one hour later in the morning when people are usually asleep anyway, at the benefit of one hour longer evenings when awake: The sunset and sunrise are one hour later than during normal time.
DST could save energy (less artificial light is needed during the evening) and make the country more efficient in addition to the pleasing effect of lighter evenings.
To make DST work, the clocks have to be adjusted one hour ahead when DST begins (during spring), and adjusted back one hour to standard time every autumn. There are many countries observing DST, and many who do not.
Note: During the months March/April-September/October, the countries on the northern hemisphere are having their summer and may observe DST, while the countries in the southern hemisphere are having winter. During the rest of the year (September/October-March/April) is the opposite: Winter on the northern hemisphere, summer in the southern... and there might be DST in countries south of equator, but there are many exceptions to this.
Benjamin Franklin suggested the method in 1784, but it was first during World War I, in 1916 in several counties in Europe that DST was adopted, although it was proposed several times before, but rejected.
Daylight Saving Time is difficult to predict in future, many countries change the transition days/principles every year because of special happenings or conditions that has happened or will happen.
There you go, have at it.
Bandit2981
07-27-2005, 06:10 PM
I dont understand how it saves energy, can anyone explain that for us morons.
The argument is that with more daylight time you won't need to use your electricity for lights in your house. I think that argument is flawed though because with more sunlight, its hotter, and your air conditioner runs more often. Hmm, AC running vs. a 40 watt bulb? Is it really going to save anyone money?
Shelly
07-27-2005, 06:11 PM
Daylight saving time
From Wikipedia, the free encyclopedia.
Daylight saving time (also called DST, or Summer Time) is the portion of the year in which a region's local time is advanced by (usually) one hour from its standard official time.
"Daylight saving time" is a system intended to "save" daylight, as opposed to "wasting" time (for example, by sleeping long past sunup). The official time is adjusted forward during the spring and summer months, so that the active hours of work and school will better match the hours of daylight.
The list of time zones has information on which areas do or do not observe DST.
The expression daylight savings time (with the extra "s") is a common alternate form but is sometimes considered to be improper English because "saving" is used here as a verbal adjective describing a single type of activity.
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Origin
It is sometimes asserted that DST was first proposed by Benjamin Franklin in a letter to the editors of the Journal of Paris [1]. However, the article was humorous; Franklin was not proposing DST, but rather that people should get up and go to bed earlier.
It was first seriously proposed by William Willett in the "Waste of Daylight" [2], published in 1907, but he was unable to get the British government to adopt it, despite considerable lobbying.
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History
The idea of daylight saving time was first put into practice by the German government during the First World War between April 30 and October 1, 1916. Shortly afterward, the United Kingdom followed suit, first adopting DST between May 21 and October 1, 1916. Then on March 19, 1918, the U.S. Congress established several time zones (which were already in use by railroads and most cities since 1883) and made daylight saving time official (which went into effect on March 31) for the remainder of World War I. It was observed for seven months in 1918 and 1919. The law, however, proved so unpopular (mostly because people rose and went to bed earlier than in modern times) that the law was later repealed.
Daylight saving time was reinstated in the United States on February 9, 1942, again as a wartime measure to conserve resources, this time in order to fight World War II. This remained in effect until the war began winding down and the requirement was removed on September 30, 1945.
From 1945 to 1966, U.S. federal law did not address daylight saving time. States and localities were free to observe daylight saving time or not. This resulted in a patchwork where some areas observed DST and adjacent areas did not, and it was not unheard of to have to reset one's clock several times during a relatively short trip (e.g., bus drivers operating between Moundsville, West Virginia, and Steubenville, Ohio had to reset their watches seven times over 35 miles). The U.S. federal Uniform Time Act of 1966 mandated that daylight saving time begin nationwide on the last Sunday of April and end on the last Sunday of October. Any state that wanted to be exempt from daylight saving time could do so by passing a state law, provided that it exempt the entire state. The law was amended in 1972 to permit states that straddle a time zone boundary to exempt the entire area of the state lying in one time zone. The law was amended again in 1986 to begin daylight saving time on the first Sunday in April, to take effect the following year.
In response to the 1973 energy crisis, daylight saving in the United States was begun earlier in both 1974 and 1975, commencing on the first Sunday in January in the former year and the last Sunday in February in the latter.
On July 21, 2005 the U.S. House of Representatives and U.S. Senate agreed to a compromise bill that would extend DST by one month. Daylight saving time would begin three weeks earlier (on the second Sunday of March) and end on the first Sunday of November. The House had previously approved a motion that would have extended DST for two months. The extension was criticized by the airline industry [3], by observant Jews [4], and by persons concerned for the safety of children traveling to school in the dark before the later sunrise [5].
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Rationales for DST
One of the major reasons given for observing DST in the United States is energy conservation. Theoretically, the amount of residential electricity needed in the evening hours is dependent both on when the sun sets and when people go to bed. Because people tend to observe the same bedtime year-round, by artificially moving sunset one hour later, the amount of energy used is theoretically reduced. United States Department of Transportation studies showed that DST reduces the country's electricity usage by one percent during each day DST is in effect.
Part of the reason that it is normally observed in the late spring, summer, and early autumn is because during the winter months the amount of energy saved by moving sunset one hour later is negated by the increased need for morning lighting by moving sunrise by the same amount. During the summer most people would wake up after the sun rises, regardless of whether daylight saving time is in effect or not, so there is no increased need for morning lighting to offset the afternoon energy savings.
Another perceived benefit of DST is increased opportunities for outdoor activities. Most people plan outdoor activities during the increased hours of sunlight. Other benefits cited include prevention of traffic injuries (by allowing more people to return home from work or school in daylight), and crime reduction (by reducing people's risk of being targets of crimes that are more common in dark areas).
When the U.S. went on extended DST in 1974 and 1975 in response to the 1973 energy crisis, Department of Transportation studies found that observing DST in March and April saved 10,000 barrels of oil a day, and prevented about 2,000 traffic injuries and 50 fatalities saving about U.S. $28 million in traffic costs. [6]
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Criticism of DST
DST is not universally accepted; many localities do not observe it. Opponents claim that there is not enough benefit to justify needing to adjust clocks twice every year. The disruption in sleep patterns associated with setting clocks forward, and thereby "losing" an hour, correlates with a spike in the number of severe auto accidents, as well as emotional trauma and lost productivity as tired workers adjust to the schedule change. It is also noted that much effort is spent reminding everyone twice a year of the change, and thousands are inconvenienced by showing up at the wrong time when they forget.
There is also a question whether the savings in lighting costs justifies the increase in summertime air conditioning costs. While most people use more sunlight under DST, most people also experience more heat, which prompts many people to turn on the air conditioner during the warmer afternoon hours. When air conditioning was not widely available, the change did save energy; however, air conditioning is much more widespread now than it was several decades ago. Air conditioning often uses more energy than artificial lighting.
No formal studies have been performed, but an enormous amount of time has been spent by software developers to deal with the fact that 2400 hours past 2pm is not necessarily 2pm 100 days later.
Some campaigners in Britain would like the country to stay on British Summer Time (BST) all year round, or in other words, adopt Central European Time and abolish BST. Alternatively, some would like Britain to adopt Central European Time and jump forward another hour during the summer (adopting a Single/Double Summer Time from Britain's perspective). This would make winter evenings longer, thereby reducing traffic accidents and cases of seasonal affective disorder. Opponents point to the longer hours of darkness on winter mornings, especially in Scotland, which might well cause an increase in road accidents. It has even been suggested that Scotland should be placed on a different time zone from the rest of the UK, which, unlikely though it may sound, would be possible as the UK Parliament could legislate to put the UK forward an hour, and then the Scottish Parliament could put Scotland back onto GMT.
DST is particularly unpopular among people working in agriculture because the animals do not observe it, and thus the people are placed out of synchronization with the rest of the community, including school times, broadcast schedules, and the like.
Canadian author Robertson Davies, in The Diary of Samuel Marchbanks (1947), wrote the following: "I object to being told that I am saving daylight when my reason tells me that I am doing nothing of the kind ... At the back of the Daylight Saving scheme, I detect the bony, blue-fingered hand of Puritanism, eager to push people into bed earlier, and get them up earlier, to make them healthy, wealthy, and wise in spite of themselves."
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DST and the state of Indiana
DST is a long-standing controversy in Indiana, not only as an agricultural state, but also because the border separating the eastern and central time zones divides the state. In the past, neighboring communities sometimes ended up one or even two hours apart. Being out-of-sync with neighboring states and the national changing of clocks, it is argued, has a negative economic impact on the state. It has been demonstrated that some businesses have located outside of the state once the confusion related to not changing clocks is discovered. In the current compromise, the state has three kinds of time zones:
* 77 counties, most of the state, are on Eastern Standard Time but do not use DST;
* 5 counties near Chicago, Illinois and 5 counties in the southwestern corner of the state are on Central Standard Time and do use DST; and
* 2 counties near Cincinnati, Ohio and 3 counties near Louisville, Kentucky are on Eastern Standard time but do observe DST. Their observance of DST is unofficial in this case, as a strict reading of the Uniform Time Act would not allow for this situation, but by observing DST, they remain synchronized with the greater Louisville and Cincinnati metropolitan areas.
On April 29, 2005, the Indiana legislature voted to begin observing Daylight Saving Time in 2006; however, what time zone the state will be placed in is unknown pending federal hearings [7].
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DST around the world
Daylight saving time is generally a temperate zone practice; day lengths in the tropics do not vary enough to justify DST. Hawaii, the only U.S. state in the tropics, does not observe DST. However, Mexico has adopted DST nationwide, even in its tropical regions, because of its increasing economic ties to the United States. The Mexican state of Sonora does not observe DST because it borders on the U.S. state of Arizona which also does not observe DST (except in the large Navajo Indian Reservation in northeastern Arizona). Polar or near-polar locations such as Iceland often opt out as well, as summer in these locations usually brings nearly uninterrupted daylight.
The amount of the time shift varies, but one hour is the most common. The dates of the beginning and ending of DST also vary by country. With a few exceptions, switchovers between standard time and daylight saving time generally occur in the early morning hours of a Sunday morning, presumably because doing so then causes less disruption than a change on a weekday would.
DST commonly begins in the Northern Hemisphere on either the first Sunday in April or the last Sunday in March, and ends on the last Sunday in October. In the Southern Hemisphere, the beginning and ending dates are switched (thus the time difference between, e.g., the United Kingdom and Chile may be three, four, or five hours).
North America generally follows the same procedure, going by local time in each zone, each time zone switching at 02:00 LST (local standard time) to 03:00 LDT (local daylight time) on the first Sunday in April, and again from 02:00 LDT to 01:00 LST on the last Sunday in October. The Canadian province of Newfoundland and Labrador is an exception in that the time changes take place at 00:01 local standard time and 00:01 local daylight time respectively. Legislation pending in Congress would extend DST from the first Sunday in March until the first Sunday in November. The proposed change to help save energy faces little opposition and is expected to pass; reaction is mixed, however, in neighbouring countries such as Canada, where integrated economies and schedules would likely require a change as well.
All countries in Europe, except Iceland as already noted, observe daylight-saving time and change on the same date: moving clocks forward one hour on the last Sunday in March and back one hour on the last Sunday in October. In the West European (UTC), Central European (UTC+1), and East European (UTC+2) time zones the change is simultaneous: on both dates the clocks are changed everywhere at 01:00 UTC, i.e. from local times of 01:00/02:00/03:00 to 02:00/03:00/04:00 in March, and vice versa in October. (See also: European Summer Time). In Russia, however, although the changeover dates are the same, clocks are moved forward or back at 02:00 local time in all zones. Thus in Moscow (local time = UTC+3 in winter, UTC+4 in summer), daylight-saving time commences at 05:00 UTC on the last Sunday in March, and ends at 06:00 UTC on the last Sunday in October.
With Iceland observing UTC all year round, despite being at a longitude which would indicate UTC-1, the country may be said to be on continuous DST.
Egypt switches to DST on midnight of the last Thursday of April, since the weekend holiday for most Egyptians is on Friday, thus giving workers and students a chance to adjust. Israel adopts Daylight Saving Time on the last Friday of March at 02:00, and returns to standard time at 02:00 of the Sunday of the month of Tishrei between Rosh Hashanah and Yom Kippur.
The People's Republic of China experimented with DST from 1986, but abandoned it in the 1990s. The PRC now uses one universal time zone for all of the nation from Urumqi in the northwest to Fujian in the southeast; the size of the nation was a major factor why DST was not considered practical in China.
Australia has a mixed implementation of daylight saving time. During winter it has three time zones, but when daylight saving time is in effect, it has five time zones (mostly differing by 30 minutes) ranging from UTC+8 to UTC+11. Although there have been several referenda on the topic, Western Australia, the Northern Territory and Queensland have not adopted the practice. As a result, the tropical regions of the country do not observe daylight saving. Interestingly, during daylight saving time, South Australia observes a time later than Queensland, despite the latter being almost entirely further east. Tasmania starts DST earlier than the rest of the country, usually at the start of October.
Cuba always starts its DST on April 1 but the end date varies.
Brazil adopted DST for the first time in 1931, but uninterruptedly since 1985 in southern states (south, southeast regions and states of Goiás and Mato Grosso do Sul). Starting and ending dates are variable: normally, Brazilian DST starts at 00:00 on an October (rarely November) Sunday and ends at 00:00 on a February Sunday.
The Canadian province of Saskatchewan is the only part of that country (other than northeastern British Columbia and Southampton Island) that does not use DST. However, the charter of the city of Lloydminster, which is bisected by the Saskatchewan–Alberta border, gives it the special exception of using DST. Lloydminster and its immediately surrounding region in Saskatchewan use DST with Mountain Standard Time, which is the time used by Alberta.
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Mnemonic
The mnemonic "spring forward, fall back" tells us how to reset clocks when the time changes, regardless of hemisphere. This uses the word "fall" to mean "autumn"; while this usage has died out in British English, it is still very common in American English and Canadian English.
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Associated practices
Fire safety officials in Australia, Canada, New Zealand, and the United States encourage citizens to use the two annual time changes as a reminder to check the batteries in home and office fire alarms and smoke detectors. For example, the Country Fire Authority of Victoria in Australia has been running a program called "Change Your Clock, Change Your Smoke Alarm Battery" for several years.
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