The United States. Daylight saving time, also called “summer time,” is the practice of advancing clocks forward by one hour in the spring to gain additional daylight during the early evening. In the fall, clocks are again turned back an hour. The U.S. federal law that established “daylight time” in this country does not require its observance. Arizona, Hawaii, and the territories of Puerto Rico, Virgin Islands, and American Samoa do not use DST. These areas receive so much sun throughout the year that gaining another hour of sunlight in the summertime is not seen as a benefit.
DST Dawns in Indiana. Until April 2005, when Indiana passed a law agreeing to observe daylight saving time, the Hoosier state had its own unique and complex time system. Not only is the state split between two time zones, but until recently, only some parts of the state observed daylight saving time while the majority did not. Under the old system, 77 of the state's 92 counties were in the Eastern time zone but did not change to daylight time in April. Instead they remained on standard time all year. That is, except for two counties near Cincinnati, Ohio, and Louisville, Ky., which did use daylight time. But the counties in the northwest corner of the state (near Chicago) and the southwestern tip (near Evansville), which are in the central time zone, used both standard and daylight time.
The battle between the old system and DST was contentious and hard-won. Bills proposing DST had failed more than two dozen times before it squeaked through the state legislature in April 2005. In April 2006, Indiana joined 47 other states in observing DST for the first time.
Around the World. About 70 countries around the world observe daylight saving time in some form. Here are some interesting facts:
The year 2006 will be the last year in which clocks are set forward one hour on the first Sunday in April at 2:00 a.m. local time and set back one hour the last Sunday in October, also at 2:00 a.m. Starting in 2007, DST will be observed from the second Sunday in March to the first Sunday in November, adding a month to daylight saving time.
|2006||April 2||October 29|
|2007||March 11||November 4|
|2008||March 9||November 2|
|2009||March 8||November 1|
|2010||March 14||November 7|
|2011||March 13||November 6|
|2012||March 11||November 4|
|World Time Zones and Time Zone Map||Calendar||Sundials|