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Coordinated Universal Time (abbreviated to UTC) is the primary time standard by which the world regulates clocks and time. World time is added to or subtracted from the time at 0° longitude, which is not adjusted for daylight saving time.

Time ZoneTime ExamplesStandard TimeDaylight TimeZone
Hawaii-Aleutian Time Zone06 AM–11 AMHST (UTC–10:00)HST (UTC–10:00)Zone W
Alaska Time Zone07 AM–12 PMAKST (UTC–09:00)AKDT (UTC–08:00)Zone V
Pacific Time Zone08 AM–01 PMPST (UTC−08:00)PDT (UTC−07:00)Zone U
Mountain Time Zone09 AM–02 PMMST (UTC−07:00)MDT (UTC−06:00)Zone T
Central Time Zone10 AM–03 PMCST (UTC−06:00)CDT (UTC−05:00)Zone S
Eastern Time Zone11 AM–04 PMEST (UTC−05:00)EDT (UTC−04:00)Zone R
Atlantic Time Zone12 PM–05 PMAST (UTC–4:00)AST (UTC–4:00)Zone Q

Primary Time Zones

Pacific Time: California, Washington, Oregon, Nevada, Idaho

Mountain Time: Arizona (No Daylight Savings outside of Navajo Nation), Colorado, Idaho, Kansas, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Texas, Utah, Wyoming

Central Time: Alabama, Arkansas, Florida, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Michigan, Minnesota, Mississippi, Missouri, Nebraska, North Dakota, Oklahoma, South Dakota, Tennessee, Texas, Wisconsin

Eastern Time: Connecticut, Florida, District of Columbia, Delaware, Georgia, Indiana, Kentucky, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont, Maryland, Virginia, West Virginia

USA Timezone Map

There are four time primary zones across the contiguous United States. Some United States Minor Outlying Islands are outside the time zones. Alaska is 1 hour behind Pacific Time and Hawaii, depending upon Daylight Saving Time, is 2 hours behind. Bermuda and the Caribbean Islands, including Puerto Rico, observe Atlantic Standard Time without observing Daylight Saving Time.

Daylight Saving Time

Daylight saving time (DST) begins on the second Sunday in March and ends on the first Sunday in November. Arizona and Hawaii use standard time throughout the year. Clocks are set ahead one hour at 2 AM on the following start dates and set back one hour at 2 AM on these ending dates:

YearStart dateEnding date
2019March 10November 3
2020March 8November 1
2021March 14November 2
2022March 13November 6
2023March 12November 5
2024March 10November 3
2025March 9November 2