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Time in the United States

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Time in the United States

In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation, but no single official map of those existed until the agency announced intentions to make one in September 2022. Official and highly precise timekeeping services (clocks) are provided by two federal agencies: the National Institute of Standards and Technology (NIST) (an agency of the Department of Commerce); and the United States Naval Observatory (USNO). The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations. It is the combination of the time zone and daylight saving rules, along with the timekeeping services, which determines the legal civil time for any U.S. location at any moment.

Infobox

Guam
11:42 pm, December 20, 2025 [refresh]
Samoa
2:42 am, December 20, 2025 [refresh]
Alaska
4:42 am, December 20, 2025 [refresh]
Central
7:42 am, December 20, 2025 [refresh]
Eastern
8:42 am, December 20, 2025 [refresh]
Pacific
5:42 am, December 20, 2025 [refresh]
Atlantic
9:42 am, December 20, 2025 [refresh]
Mountain
6:42 am, December 20, 2025 [refresh][a]
Current time
Current time Guam11:42 pm, December 20, 2025 [refresh]Atlantic9:42 am, December 20, 2025 [refresh]Eastern8:42 am, December 20, 2025 [refresh]Central7:42 am, December 20, 2025 [refresh]Mountain6:42 am, December 20, 2025 [refresh][a]Pacific5:42 am, December 20, 2025 [refresh]Alaska4:42 am, December 20, 2025 [refresh]Hawaii–Aleutian3:42 am, December 20, 2025 [refresh][b]Samoa2:42 am, December 20, 2025 [refresh]
Hawaii–Aleutian
3:42 am, December 20, 2025 [refresh][b]

Tables

Standard time zones of the United States and its surrounding areas[9] · United States and regional time zones
Atlantic
Atlantic
Time zone
Atlantic
Standard
UTC−04:00
DST
(not observed)
Region
Puerto Rico, U.S. Virgin Islands
Eastern
Eastern
Time zone
Eastern
Standard
UTC−05:00
DST
UTC−04:00
Region
Connecticut, Delaware, Georgia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Vermont, Virginia, Washington, D.C., West Virginia; Partially: Florida, Indiana, Kentucky, Michigan, Tennessee
(not observed)
(not observed)
Time zone
(not observed)
Standard
No DST observed, not defined by 15 U.S.C. §260: Navassa Island, Bajo Nuevo Bank, Serranilla Bank
Central
Central
Time zone
Central
Standard
UTC−06:00
DST
UTC−05:00
Region
Alabama, Arkansas, Illinois, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma, Wisconsin; Partially: Florida, Indiana, Kansas, Kentucky, Michigan, Nebraska, North Dakota, South Dakota, Tennessee, Texas
Mountain
Mountain
Time zone
Mountain
Standard
UTC−07:00
DST
UTC−06:00
Region
Colorado, Montana, New Mexico, Utah, Wyoming; Partially: Idaho, Kansas, Nebraska, Nevada, North Dakota, Oregon, South Dakota, Texas
(not observed)
(not observed)
Time zone
(not observed)
Standard
Arizona (no DST outside of Navajo Nation)
Pacific
Pacific
Time zone
Pacific
Standard
UTC−08:00
DST
UTC−07:00
Region
California, Washington; Partially: Idaho, Nevada, Oregon
Alaska
Alaska
Time zone
Alaska
Standard
UTC−09:00
DST
UTC−08:00
Region
Partially: Alaska
Hawaii–Aleutian
Hawaii–Aleutian
Time zone
Hawaii–Aleutian
Standard
UTC−10:00
DST
UTC−09:00
Region
Partially: Alaska
(not observed)
(not observed)
Time zone
(not observed)
Standard
Hawaii, Not defined by 15 U.S.C. §260: Johnston Atoll (no DST observed in Hawaii and Johnston Atoll)
American Samoa
American Samoa
Time zone
American Samoa
Standard
UTC−11:00
DST
(not observed)
Region
American Samoa; Not defined by 15 U.S.C. §260: Jarvis Island, Midway Atoll, Palmyra Atoll, Kingman Reef
—
—
Time zone
—
Standard
UTC−12:00
DST
(not observed)
Region
Not defined by 15 U.S.C. §260: Baker Island, Howland Island
—
—
Time zone
—
Standard
UTC+12:00
DST
(not observed)
Region
Not defined by 15 U.S.C. §260: Wake Island
Chamorro
Chamorro
Time zone
Chamorro
Standard
UTC+10:00
DST
(not observed)
Region
Guam, Northern Mariana Islands
Time zone
Standard
DST
Region
Atlantic
UTC−04:00
(not observed)
Puerto Rico, U.S. Virgin Islands
Eastern
UTC−05:00
UTC−04:00
Connecticut, Delaware, Georgia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Vermont, Virginia, Washington, D.C., West Virginia; Partially: Florida, Indiana, Kentucky, Michigan, Tennessee
(not observed)
No DST observed, not defined by 15 U.S.C. §260: Navassa Island, Bajo Nuevo Bank, Serranilla Bank
Central
UTC−06:00
UTC−05:00
Alabama, Arkansas, Illinois, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma, Wisconsin; Partially: Florida, Indiana, Kansas, Kentucky, Michigan, Nebraska, North Dakota, South Dakota, Tennessee, Texas
Mountain
UTC−07:00
UTC−06:00
Colorado, Montana, New Mexico, Utah, Wyoming; Partially: Idaho, Kansas, Nebraska, Nevada, North Dakota, Oregon, South Dakota, Texas
(not observed)
Arizona (no DST outside of Navajo Nation)
Pacific
UTC−08:00
UTC−07:00
California, Washington; Partially: Idaho, Nevada, Oregon
Alaska
UTC−09:00
UTC−08:00
Partially: Alaska
Hawaii–Aleutian
UTC−10:00
UTC−09:00
Partially: Alaska
(not observed)
Hawaii, Not defined by 15 U.S.C. §260: Johnston Atoll (no DST observed in Hawaii and Johnston Atoll)
American Samoa
UTC−11:00
(not observed)
American Samoa; Not defined by 15 U.S.C. §260: Jarvis Island, Midway Atoll, Palmyra Atoll, Kingman Reef
—
UTC−12:00
(not observed)
Not defined by 15 U.S.C. §260: Baker Island, Howland Island
—
UTC+12:00
(not observed)
Not defined by 15 U.S.C. §260: Wake Island
Chamorro
UTC+10:00
(not observed)
Guam, Northern Mariana Islands
Dates for daylight saving time · Daylight saving time (DST)
2025
2025
Year
2025
Start
March 9
End
November 2
2026
2026
Year
2026
Start
March 8
End
November 1
2027
2027
Year
2027
Start
March 14
End
November 7
2028
2028
Year
2028
Start
March 12
End
November 5
2029
2029
Year
2029
Start
March 11
End
November 4
2030
2030
Year
2030
Start
March 10
End
November 3
2031
2031
Year
2031
Start
March 9
End
November 2
2032
2032
Year
2032
Start
March 14
End
November 7
2033
2033
Year
2033
Start
March 13
End
November 6
2034
2034
Year
2034
Start
March 12
End
November 5
Year
Start
End
2025
March 9
November 2
2026
March 8
November 1
2027
March 14
November 7
2028
March 12
November 5
2029
March 11
November 4
2030
March 10
November 3
2031
March 9
November 2
2032
March 14
November 7
2033
March 13
November 6
2034
March 12
November 5
Previous DST change dates · Daylight saving time (DST)
2000
2000
Year
2000
Start
Apr 2
End
Oct 29
2001
2001
Year
2001
Start
Apr 1
End
Oct 28
2002
2002
Year
2002
Start
Apr 7
End
Oct 27
2003
2003
Year
2003
Start
Apr 6
End
Oct 26
2004
2004
Year
2004
Start
Apr 4
End
Oct 31
2005
2005
Year
2005
Start
Apr 3
End
Oct 30
2006
2006
Year
2006
Start
Apr 2
End
Oct 29
2007
2007
Year
2007
Start
Mar 11
End
Nov 4
2008
2008
Year
2008
Start
Mar 9
End
Nov 2
2009
2009
Year
2009
Start
Mar 8
End
Nov 1
2010
2010
Year
2010
Start
Mar 14
End
Nov 7
2011
2011
Year
2011
Start
Mar 13
End
Nov 6
2012
2012
Year
2012
Start
Mar 11
End
Nov 4
2013
2013
Year
2013
Start
Mar 10
End
Nov 3
2014
2014
Year
2014
Start
Mar 9
End
Nov 2
2015
2015
Year
2015
Start
Mar 8
End
Nov 1
2016
2016
Year
2016
Start
Mar 13
End
Nov 6
2017
2017
Year
2017
Start
Mar 12
End
Nov 5
2018
2018
Year
2018
Start
Mar 11
End
Nov 4
2019
2019
Year
2019
Start
Mar 10
End
Nov 3
2020
2020
Year
2020
Start
Mar 8
End
Nov 1
2021
2021
Year
2021
Start
Mar 14
End
Nov 7
2022
2022
Year
2022
Start
Mar 13
End
Nov 6
2023
2023
Year
2023
Start
Mar 12
End
Nov 5
2024
2024
Year
2024
Start
Mar 10
End
Nov 3
2025
2025
Year
2025
Start
Mar 9
End
Nov 2
Year
Start
End
2000
Apr 2
Oct 29
2001
Apr 1
Oct 28
2002
Apr 7
Oct 27
2003
Apr 6
Oct 26
2004
Apr 4
Oct 31
2005
Apr 3
Oct 30
2006
Apr 2
Oct 29
2007
Mar 11
Nov 4
2008
Mar 9
Nov 2
2009
Mar 8
Nov 1
2010
Mar 14
Nov 7
2011
Mar 13
Nov 6
2012
Mar 11
Nov 4
2013
Mar 10
Nov 3
2014
Mar 9
Nov 2
2015
Mar 8
Nov 1
2016
Mar 13
Nov 6
2017
Mar 12
Nov 5
2018
Mar 11
Nov 4
2019
Mar 10
Nov 3
2020
Mar 8
Nov 1
2021
Mar 14
Nov 7
2022
Mar 13
Nov 6
2023
Mar 12
Nov 5
2024
Mar 10
Nov 3
2025
Mar 9
Nov 2

References

  1. Time in Arizona (besides the Navajo Nation): 6:42 am, December 20, 2025 [refresh]
    https://en.wikipedia.org/w/index.php?title=Time_in_the_United_States&action=purge
  2. Time in Hawaii: 3:42 am, December 20, 2025 [refresh]
    https://en.wikipedia.org/w/index.php?title=Time_in_the_United_States&action=purge
  3. "DOT to map out nation's time zones after report shows no official map exists"
    https://www.cnn.com/2022/09/22/politics/time-zone-map-transportation-department/index.html
  4. "Why Do We Have Time Zones?"
    http://www.timeanddate.com/time/time-zones-history.html
  5. World Who's Who in Science: A Biographical Dictionary of Notable Scientists from Antiquity to the Present
    https://archive.org/details/worldwhoswhoinsc0000unse/page/2
  6. "Greenwich Mean Time (GMT)—time, facts, history"
    https://greenwichmeantime.com/what-is-gmt/
  7. Open House Chicago
    https://openhousechicago.org/sites/site/the-central-standard-building/
  8. Metrologia
    https://ui.adsabs.harvard.edu/abs/2011Metro..48S.181G
  9. "15 U.S. Code Subchapter IX—STANDARD TIME"
    https://www.law.cornell.edu/uscode/text/15/chapter-6/subchapter-IX
  10. Public Law 110–69—America COMPETES Act (August 9, 2007). Sec. 3013)
    https://www.congress.gov/110/plaws/publ69/PLAW-110publ69.pdf
  11. Standard Time Zone Boundaries 49CFR71
    https://www.gpo.gov/fdsys/pkg/CFR-2010-title49-vol1/pdf/CFR-2010-title49-vol1-part71.pdf
  12. CNET
    https://www.cnet.com/culture/senate-unanimously-passes-bill-to-make-daylight-saving-time-permanent/
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