The End of Daylight Saving Time in 2019

On 2 a.m. today, we turned our clocks back one hour, marking the end of daylight saving time (DST) in 2019.

Postcard US-4002383 to Russia shows Hoover Dam with Arizona side on the right and Nevada side on the left, with the state boundary running across the dam.

Since Arizona is in the Mountain Time Zone (GMT-7) whereas Nevada is in the Pacific Time Zone (GMT-8), Arizona is one hour ahead. Therefore, if you stand across the state line on the dam right now, your left-side of body and your right-side of body will be in different time zones with one-hour time difference.

However, because Nevada observes DST while Arizona does not, during the summer there is no time difference. Interesting? Confusing? Next time when you visit the dam, pay attention to the clocks on the two intake towers; you will see.

Daylight saving time will return at 2:00 AM on Sunday, March 8, 2020.

Daylight Saving Time Ends in 2013

Daylight saving time (DST) ends today in the morning at 2:00 am. Following the expression Spring Forward, Fall Back, we set clocks back one hour, saying good bye to DST and entering Standard Time. DST returns next year on March 9, 2014.

Most areas of the United States currently observe DST. However, most areas of Arizona (except for the Navajo Nation, a Native American Reservation), along with Hawaii and the overseas territories of Puerto Rico, American Samoa, Guam, Northern Mariana Islands, and the United States Virgin Islands, do not observe DST. Arizona opted out the DST in 1968 largely in part because of Phoenix and Tucson being among the hottest US metropolitan areas in the summer. Extending daylight hours results in more people being active, thus more power usage from air conditioning units and cooling systems in homes and businesses.

Postcard US-2248458 to Tucson, Arizona showing Hoover Dam with Arizona side in the foreground and Nevada side in the background, as the state boundary runs across the dam. Since Arizona is in the Mountain Time Zone (GMT-7) whereas Nevada is in the Pacific Time Zone (GMT-8), Arizona is one hour ahead. However, because Nevada observes DST while Arizona does not, during the summer the clocks on the intake towers will show the same time. During the winter, the clock on the Nevada side will be one hour behind from the one on the Arizona side.

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