This typically involves advancing the time on a clock by one hour in early spring, and "rolling back" the time in autumn. Many countries or regions, especially those in Europe and North America, practice daylight saving time (DST), sometimes referred to as "summer time," with the intent of saving energy. The regions that don't observe DST include those in the Atlantic, Samoa, and Chamorro Time Zones. During DST, the regions that observe DST are offset one hour closer to UTC. territories.Īll of these time zones have standard time zones that are offset from UTC, from UTC-04:00 through UTC+10:00, though some additionally observe daylight saving time (DST). Three states are split between the Pacific Time Zone and the Mountain Time Zone, and Alaska is split between the Pacific Time Zone and Alaska Time Zone.Ītlantic, Alaska, Hawaii-Aleutian, Samoa, and Chamorro Time Zones cover the rest of the United States, including Alaska, Hawaii, and the other U.S. California and Washington are fully within PT.
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