CNN Student News One-Sheet: Daylight-Saving Time

(CNN Student News) -- Use this explainer to assist pupils understand the grounds for and history of daylight-saving time.

What is daylight-saving time? Daylight-saving time is a system established to cut down energy usage by extending daytime hours (clocks are put ahead one hour). This year, daylight-saving clip gets at 2 americium on Sunday, March 9, 2008. Daylight-saving time stops at 2 americium on Sunday, November 2, 2008. In the past, daylight-saving clip began in April and ended in October. However, an energy measure signed by President Saint George W. Shrub on August 8, 2005 drawn-out daylight-saving clip as portion of a long-term solution to the nation's energy problems. The new law extended daylight-saving time by four weeks; beginning three hebdomads earlier and ending one hebdomad later. Also under the new laws, the full state of Hoosier State now detects daylight-saving time. Prior to the new laws, only certain countries of the state observed the clip changes.

Exceptions in the United States In the United States, Aloha State and most of Grand Canyon State make not follow daylight-saving time. The U.S. districts of Guam, Puerto Rico, Virgin Islands and American Independent State Of Samoa also make not detect daylight-saving time.

What states follow daylight-saving time?

• About 70 states around the human race detect daylight-saving time. • Neither People'S Republic Of China nor Japanese Islands detects daylight-saving time. • Many other states mention to "daylight-saving time" as "summertime."

The history of daylight-saving time

1784 - Benzoin John Hope Franklin is thought to have got come up up with the thought for daylight-saving time. In somes capricious missive to a Gallic journal, he said that Parisians could salvage one thousands of francs a twelvemonth by waking up earlier during the summertime because it would forestall them from having to purchase so many tapers to illume the eventide hours.

1918 - The U.S. first follows daylight-saving time, in the same enactment that created standard clip zones, in an attempt to salvage energy during World War I. It didn't turn out popular, and, as a result, it was repealed the followers year.

1942 - President John Hope Franklin D. Franklin Roosevelt instituted "war-time," a year-round daylight-saving time to salvage energy during World War II. After the year-round shift ended in 1945, many states adopted their ain summertime clip changes.

1966 - United States Congress established a national form for summertime clip alterations with the Uniform Time Act. The enactment came in response from the transportation system industry, which demanded consistence across clip zones. The U.S. Department of Transportation System now supervises clip alterations in the United States.

1973 - An oil trade embargo by the Organization of Petroleum Exporting Countries led United States Congress to ordain a diagnostic test time period of year-round daylight-saving time in 1974 and 1975. The diagnostic test time period was controversial; it ended after ailments that the dark wintertime morns endangered children traveling to school. The U.S. returned to summertime daylight-saving clip in 1975.

1986 - The federal law is amended to begin daylight-saving time on the first Lord'S Day in April, beginning in 1987. The termination day of the month of daylight-saving clip was never changed, and remained the last Lord'S Day in October through 2006.

2005 - On August 8, President Shrub marks the Energy Policy Act of 2005 into law. Part of the enactment will widen daylight-saving time starting in 2007, from the 2nd Lord'S Day in March to the first Lord'S Day in November.

2008 - Daylight-saving time gets on Sunday, March 9 and ends on Sunday, November 2.