![]() ![]() and the five additional time zones used in Alaska, Hawaii and other U.S. The DST runs from 2 pm on the 2nd Sunday in March to 2 am on the first Sunday in November. With the 2019 Fall release of the National Transportation Atlas Database (NTAD), a new map of the nation’s time zones is featured, showing the geographical boundaries of four time zones in the continental U.S. The Daylight Saving Time (DST) is observed in the whole of US states and territories except in Hawaii, Puerto Rico, American Samoa, US Virgin Island, and Arizona (observed only in Navajo Nation). For instance, Howland Island and Baker Island use UTC-12:00 and are sometimes assigned Anywhere on Earth (AoE). Timezones Central America Standard Time, (GMT-06:00) Central America Eastern Standard Time, (GMT-05:00) Eastern Time (US and Canada) U.S. The US also possesses outlying islands which do not observe any of the nine time zones. Different Time Zones in the USA Pacific Standard Time (PST) Mountain Standard Time (MST) Chamorro Standard Time (UTC+10) Atlantic Standard Time (AST). Central Time Zone (Zone S), which comprises roughly the Gulf Coast, Mississippi Valley, and most of the Great Plains. ![]() The US territories observe Samoa Time Zone (American Samoa), Atlantic Time Zone (US Virginia Islands and Puerto Rico), and Chamorro Time Zone (the Northern Mariana Islands and Guam). From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley. The state of Alaska observes Alaskan Time Zone (UTC-09:00), while Hawaii and parts of the Aleutian Islands have Hawaii-Aleutian Time Zone (UTC-09:00). For instance, Eastern Time refers to EST or EDT. The continental time-zones are PST (Pacific Standard Time), MST (Mountain Standard Time), CST (Central Standard Time), EST (Eastern Standard Time). The United States follows Daylight Savings Time from March to November with. The time zones observed by the 48 states use generic names, without highlighting the difference between DST and standard time designations. Including the territories of the United States there are a total of 10 timezones. The DST is observed in all of the contiguous states except Arizona (observed only in the Navajo Nation). Today, the United States and its territories encompass nine standard time zones in Coordinated Universal Time (UTC), the successor to GMT. The first frost date for Zone 1 falls around August 25. Mountain Time Zone The Mountain Time Zone (MT) observes standard time by subtracting 7 hours from UTC (UTC-07:00) and 6 hours during DST (UTC-06:00). Washington, Nevada, California, and parts of Oregon and Idaho observe Pacific Time Zone (UTC-07:00) while the states straddled by the Rocky Mountains and Great Plains’ western quarter have Mountain Time Zone (UTC-06:00). In Zone 1, the last frost of spring may occur as late as June 4. ![]()
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