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Arizona (with the exception of the Navajo Nation) and Hawaii do not observe Daylight Saving Time.
Indiana adopted its use beginning in 2006. American Samoa, Guam, Puerto Rico, and the Virgin Islands still do not observe DST.

en.wikipedia.org/wiki/Daylight_saving_time_in_the_United_States

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 .... As of 2014, the following states and territories are not observing DST: ...

www.timeanddate.com/time/us/arizona-no-dst.html

Almost all of the US state of Arizona does not use Daylight Saving Time (DST), and ... extending the daylight hours into the evening is that people prefer to do their ... again with the few western border communities observing Pacific War Time.

www.tulsalibrary.org/faq/which-states-do-not-observe-daylight-saving-time

Currently, Arizona, Hawaii, the eastern time zone portion of Indiana, Puerto Rico, the U.S. Virgin Islands and American Samoa do not observe Daylight Saving ...

www.usatoday.com/story/news/nation-now/2017/03/09/arizona-no-daylight-saving-time/98964644

Mar 9, 2017 ... Why Arizona doesn't observe daylight-saving time. USA Today Network ... Some things you can do with that extra hour. Wochit. AP TIME ... The Grand Canyon State is just fine where it is as the nation springs ahead. ... The Navajo Reservation observes daylight saving time; the Hopi Reservation does not.

www.accuweather.com/en/weather-news/poll-fall-back-end-daylight-saving-time/36571690

Nov 7, 2016 ... With daylight saving no longer a federal mandate, some states have chosen not to observe it. Among the states that don't currently participate in ...

www.csmonitor.com/USA/USA-Update/2016/1105/Which-states-want-to-drop-daylight-saving-time

Nov 5, 2016 ... Hawaii and Arizona, along with three US territories, already don't observe daylight saving time. More than a dozen others have considered ...

thefw.com/2-states-dont-observe-daylight-saving-time

Mar 10, 2017 ... Daylight Saving Time is upon us. ... The roots of Daylight Saving Time (and it is Daylight Saving Time, not Daylight Savings Time) go all the way ...

news.nationalgeographic.com/news/2015/03/150306-daylight-savings-time-spring-forward-united-states-science-nation

Mar 6, 2015 ... Each U.S. state and territory is free to ignore daylight savings time, ... "Fifty-nine did not observe daylight saving. ... Research shows that given an extra hour of evening daylight, many Americans use the time to go out and do ...

www.azcentral.com/story/travel/2017/03/06/why-arizona-doesnt-observe-daylight-saving-time/98639074

Mar 6, 2017 ... But not here in Arizona. Clocks will remain untouched as daylight-saving time officially starts. The Grand Canyon State is just fine where it is as ...