Query: The 2007's early start to Daylight Saving Time contributed to global warming.

Relevant passages:
Eastern Time Zone <=SEP=> The Eastern Time Zone ( ET ) is a time zone encompassing 17 U.S. states in the eastern part of the contiguous United States , parts of eastern Canada , the state of Quintana Roo in Mexico , Panama in Central America , and the Caribbean Islands .   Places that use Eastern Standard Time ( EST ) when observing standard time ( autumn/winter ) are 5 hours behind Coordinated Universal Time ( UTC − 05:00 ) .   Eastern Daylight Time ( EDT ) , when observing daylight saving time DST ( spring/summer ) is 4 hours behind Coordinated Universal Time ( UTC − 04:00 ) .   In the northern parts of the time zone , on the second Sunday in March , at 2:00 a.m. EST , clocks are advanced to 3:00 a.m. EDT leaving a one-hour `` gap '' . On the first Sunday in November , at 2:00 a.m. EDT , clocks are moved back to 1:00 a.m. EST , thus `` duplicating '' one hour . Southern parts of the zone ( Panama and the Caribbean ) do not observe daylight saving time .

Daylight saving time in the United States <=SEP=> Daylight saving time in the United States is the practice of setting the clock forward by one hour during the warmer part of the year , so that evenings have more daylight and mornings have less . Most areas of the United States observe daylight saving time ( DST ) , the exceptions being Arizona ( except for the Navajo , who do observe daylight saving time on tribal lands ) , Hawaii , and the overseas territories of American Samoa , Guam , the Northern Mariana Islands , Puerto Rico , and the United States Virgin Islands . In general , daylight time is not observed in lower-latitude regions , as summer days are not much longer than winter ones as in higher latitudes , so the advantage of the change is smaller .   Daylight saving time starts on the second Sunday in March and ends on the first Sunday in November , with the time changes taking place at 2:00 a.m. local time . With a mnemonic word play referring to seasons , clocks `` spring forward and fall back '' -- that is , in springtime the clocks are moved forward from 2:00 a.m. to 3:00 a.m. , and in fall they are moved back from 2:00 a.m. to 1:00 a.m. Daylight saving time lasts for a total of 34 weeks ( 238 days ) every year , about 65 % of the entire year ( including leap years ) .   The following table lists recent past and near future starting and ending dates of daylight saving time in the United States :

Daylight saving time <=SEP=> Daylight saving time ( abbreviated DST ) , also sometimes erroneously referred to as daylight savings time , is the practice of advancing clocks during summer months so that evening daylight lasts longer , while sacrificing normal sunrise times . Typically , regions that use daylight saving time adjust clocks forward one hour close to the start of spring and adjust them backward in the autumn to standard time .   American inventor and politician Benjamin Franklin proposed a form of daylight time in 1784 . He wrote an essay `` An Economical Project for Diminishing the Cost of Light '' to the editor of The Journal of Paris , suggesting , somewhat jokingly , that Parisians could economize candle usage by getting people out of bed earlier in the morning , making use of the natural morning light instead . New Zealander George Hudson proposed the idea of daylight saving in 1895 . The German Empire and Austria-Hungary organized the first nationwide implementation , starting on April 30 , 1916 . Many countries have used it at various times since then , particularly since the energy crisis of the 1970s .   The practice has both advocates and critics . Some early proponents of DST aimed to reduce evening use of incandescent lighting -- once a primary use of electricity -- today 's heating and cooling usage patterns differ greatly , and research about how DST affects energy use is limited and contradictory .   DST clock shifts sometimes complicate timekeeping and can disrupt travel , billing , record keeping , medical devices , heavy equipment , and sleep patterns . Computer software often adjusts clocks automatically , but policy changes by various jurisdictions of DST dates and timings may be confusing .