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U.S. Time Zones

Q: How many time zones are in the U.S.?

The contiguous United States has four primary time zones. The 50 states use six time-zone families, and federal references count nine zones when U.S. territories are included.

Q: What are the four time zones in the contiguous United States?

Eastern Time, Central Time, Mountain Time and Pacific Time.

Q: Does Hawaii observe daylight saving time?

No. Hawaii uses Hawaii Standard Time year-round.

Explore U.S. time zones by state. Compare current local times, UTC offsets and abbreviations, find split-state exceptions, and open a detailed guide for every state.

Quick answer: The 50 U.S. states use six standard time-zone families: Eastern, Central, Mountain, Pacific, Alaska and Hawaii–Aleutian. The contiguous 48 states use four primary zones. Including U.S. territories, federal standard-time boundaries cover nine zones.

Contiguous U.S.4 primary zonesEastern · Central · Mountain · Pacific

50 states6 zone familiesAdd Alaska and Hawaii–Aleutian

U.S. + territories9 federal zonesAdd Atlantic · Samoa · Chamorro

Time Zones by State U.S. Time Zone Map DST by State

Find Your State's Time ZoneLive reference

Selected state Texas

Central Time + Mountain Time

Current zone referenceLoading…

Daylight savingObserved

State patternSplit state

Detailed guideOpen Texas →

Most of Texas uses Central Time; far West Texas uses Mountain Time.

How Many Time Zones Are in the U.S.?

Different answers can all be correct because they count different geographic scopes. Use 4 for the primary contiguous-U.S. zones, 6 for the time-zone families used by the 50 states, and 9 for the federal standard-time zones covering the United States and its territories.

Contiguous 48

4 primary zones

Eastern, Central, Mountain and Pacific cover the contiguous United States, although some states are split by a zone boundary.

All 50 states

6 zone families

Alaska and Hawaii–Aleutian join the four contiguous-U.S. zones when all 50 states are included.

Federal boundaries

9 official zones

Atlantic, Samoa and Chamorro are added when U.S. territories are included with the six state-zone families.

U.S. Time Zones Now

Current local time, abbreviation and UTC offset for one representative IANA zone in each of the six time-zone families used by the 50 states. Values update automatically from your browser's time-zone data.

Live

Time Zone	Current Time	Abbreviation	UTC Offset	Seasonal Status	Guide
Eastern Time	Live	—	—	—	Eastern Time →
Central Time	Live	—	—	—	Central Time →
Mountain Time	Live	—	—	—	Mountain Time →
Pacific Time	Live	—	—	—	Pacific Time →
Alaska Time	Live	—	—	—	Alaska →
Hawaii–Aleutian Time Western Aleutian reference	Live	—	—	—	Hawaii guide →

Hawaii itself uses Hawaii Standard Time (HST, UTC−10:00) year-round. The western Aleutian Islands share the Hawaii–Aleutian standard-time family but observe a daylight form seasonally.

The Six Time Zones Used by the 50 States

Each zone family has a standard-time form and, where daylight saving time is observed, a daylight-time form. Current abbreviations depend on the date and local rules.

ET · EST / EDTEastern TimeThe easternmost primary zone of the contiguous United States, with EST in standard time and EDT in daylight time.→ CT · CST / CDTCentral TimeOne hour behind Eastern Time in the usual U.S. relationship, with CST/CDT seasonal forms.→ MT · MST / MDTMountain TimeMountain-region reference with MST/MDT; Arizona is the major daylight-saving exception.→ PT · PST / PDTPacific TimeWest Coast reference with PST/PDT seasonal forms.→ AT · AKST / AKDTAlaska TimeMost of Alaska uses AKST/AKDT, while the far western Aleutians use Hawaii–Aleutian Time.→ HAT · HST / HDTHawaii–Aleutian TimeHST is used year-round in Hawaii; the western Aleutians use HST/HDT seasonally.→

Find a U.S. State Time Zone

Search the complete state directory or filter by zone, multiple-zone states and major DST exceptions.

Browse all 50 states ↓

Showing all 50 states.

U.S. Time Zones by State

Use this table as a fast state-level reference. Split-state rows summarize the zone families in use; open the state guide for exact county or boundary details, IANA zones, current offsets and DST rules.

DST by State →

State	Time Zone(s)	Standard	Daylight	DST	Details
Alabama Central Time statewide.	Central	CST	CDT	Yes	View guide →
Alaska Most of Alaska uses Alaska Time; the far western Aleutian Islands use Hawaii–Aleutian Time.	Alaska / Hawaii–Aleutian	AKST / HST	AKDT / HDT	Yes	View guide →
Arizona Most of Arizona stays on MST year-round; the Navajo Nation observes seasonal daylight saving time.	Mountain	MST	MDT exception	Mostly no	View guide →
Arkansas Central Time statewide.	Central	CST	CDT	Yes	View guide →
California Pacific Time statewide.	Pacific	PST	PDT	Yes	View guide →
Colorado Mountain Time statewide.	Mountain	MST	MDT	Yes	View guide →
Connecticut Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Delaware Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Florida Most of Florida uses Eastern Time; part of the western Panhandle uses Central Time.	Eastern / Central	EST / CST	EDT / CDT	Yes	View guide →
Georgia Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Hawaii Hawaii uses HST year-round and does not observe daylight saving time.	Hawaii–Aleutian	HST	—	No	View guide →
Idaho Southern Idaho uses Mountain Time; the northern panhandle uses Pacific Time.	Mountain / Pacific	MST / PST	MDT / PDT	Yes	View guide →
Illinois Central Time statewide.	Central	CST	CDT	Yes	View guide →
Indiana Most of Indiana uses Eastern Time; several counties use Central Time.	Eastern / Central	EST / CST	EDT / CDT	Yes	View guide →
Iowa Central Time statewide.	Central	CST	CDT	Yes	View guide →
Kansas Most of Kansas uses Central Time; a small western area uses Mountain Time.	Central / Mountain	CST / MST	CDT / MDT	Yes	View guide →
Kentucky Eastern Kentucky uses Eastern Time; western Kentucky uses Central Time.	Eastern / Central	EST / CST	EDT / CDT	Yes	View guide →
Louisiana Central Time statewide.	Central	CST	CDT	Yes	View guide →
Maine Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Maryland Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Massachusetts Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Michigan Most of Michigan uses Eastern Time; part of the Upper Peninsula uses Central Time.	Eastern / Central	EST / CST	EDT / CDT	Yes	View guide →
Minnesota Central Time statewide.	Central	CST	CDT	Yes	View guide →
Mississippi Central Time statewide.	Central	CST	CDT	Yes	View guide →
Missouri Central Time statewide.	Central	CST	CDT	Yes	View guide →
Montana Mountain Time statewide.	Mountain	MST	MDT	Yes	View guide →
Nebraska Eastern Nebraska uses Central Time; western Nebraska uses Mountain Time.	Central / Mountain	CST / MST	CDT / MDT	Yes	View guide →
Nevada Pacific Time is the legal statewide zone; local border practices can differ in limited communities.	Pacific	PST	PDT	Yes	View guide →
New Hampshire Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
New Jersey Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
New Mexico Mountain Time statewide.	Mountain	MST	MDT	Yes	View guide →
New York Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
North Carolina Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
North Dakota Most of North Dakota uses Central Time; part of the southwest uses Mountain Time.	Central / Mountain	CST / MST	CDT / MDT	Yes	View guide →
Ohio Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Oklahoma Central Time statewide.	Central	CST	CDT	Yes	View guide →
Oregon Most of Oregon uses Pacific Time; most of Malheur County uses Mountain Time.	Pacific / Mountain	PST / MST	PDT / MDT	Yes	View guide →
Pennsylvania Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Rhode Island Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
South Carolina Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
South Dakota Eastern South Dakota uses Central Time; western South Dakota uses Mountain Time.	Central / Mountain	CST / MST	CDT / MDT	Yes	View guide →
Tennessee West and Middle Tennessee use Central Time; East Tennessee uses Eastern Time.	Central / Eastern	CST / EST	CDT / EDT	Yes	View guide →
Texas Most of Texas uses Central Time; far West Texas uses Mountain Time.	Central / Mountain	CST / MST	CDT / MDT	Yes	View guide →
Utah Mountain Time statewide.	Mountain	MST	MDT	Yes	View guide →
Vermont Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Virginia Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Washington Pacific Time statewide.	Pacific	PST	PDT	Yes	View guide →
West Virginia Eastern Time statewide.	Eastern	EST	EDT	Yes	View guide →
Wisconsin Central Time statewide.	Central	CST	CDT	Yes	View guide →
Wyoming Mountain Time statewide.	Mountain	MST	MDT	Yes	View guide →

See Boundaries on the Map

States With More Than One Time Zone

Thirteen states span more than one official time-zone family. The exact boundary can follow county lines or other legally defined geography, so use the detailed state page when the location is near a boundary.

Alaska + Hawaii–AleutianAlaskaMost of Alaska uses Alaska Time; the far western Aleutian Islands use Hawaii–Aleutian Time.→ Eastern + CentralFloridaMost of Florida uses Eastern Time; part of the western Panhandle uses Central Time.→ Mountain + PacificIdahoSouthern Idaho uses Mountain Time; the northern panhandle uses Pacific Time.→ Eastern + CentralIndianaMost of Indiana uses Eastern Time; several counties use Central Time.→ Central + MountainKansasMost of Kansas uses Central Time; a small western area uses Mountain Time.→ Eastern + CentralKentuckyEastern Kentucky uses Eastern Time; western Kentucky uses Central Time.→ Eastern + CentralMichiganMost of Michigan uses Eastern Time; part of the Upper Peninsula uses Central Time.→ Central + MountainNebraskaEastern Nebraska uses Central Time; western Nebraska uses Mountain Time.→ Central + MountainNorth DakotaMost of North Dakota uses Central Time; part of the southwest uses Mountain Time.→ Pacific + MountainOregonMost of Oregon uses Pacific Time; most of Malheur County uses Mountain Time.→ Central + MountainSouth DakotaEastern South Dakota uses Central Time; western South Dakota uses Mountain Time.→ Central + EasternTennesseeWest and Middle Tennessee use Central Time; East Tennessee uses Eastern Time.→ Central + MountainTexasMost of Texas uses Central Time; far West Texas uses Mountain Time.→

Daylight Saving Time

U.S. DST Rules & Exceptions

In 2026, participating U.S. areas observe daylight saving time from March 8 at 2:00 a.m. local time until November 1 at 2:00 a.m. local time. Most states participate, but important exceptions make a state-only shortcut unreliable in a few places.

Most of ArizonaDoes not observe DST. The Navajo Nation is the major in-state exception and does observe seasonal clock changes.

HawaiiUses Hawaii Standard Time year-round and does not observe DST.

U.S. territoriesAmerican Samoa, Guam, the Northern Mariana Islands, Puerto Rico and the U.S. Virgin Islands do not observe DST.

Daylight Saving Time by State States Without DST

Standard vs Daylight U.S. Time Zones

Zone	Standard	Standard UTC	Daylight	Daylight UTC
Eastern	EST	UTC−05:00	EDT	UTC−04:00
Central	CST	UTC−06:00	CDT	UTC−05:00
Mountain	MST	UTC−07:00	MDT	UTC−06:00
Pacific	PST	UTC−08:00	PDT	UTC−07:00
Alaska	AKST	UTC−09:00	AKDT	UTC−08:00
Hawaii–Aleutian	HST	UTC−10:00	HDT*	UTC−09:00

*HDT applies in the daylight-observing Aleutian portion of the zone. Hawaii remains on HST year-round.

Popular State Time Zone Guides

Open the dedicated state owner for exact boundaries, IANA identifiers, current offsets, abbreviations and daylight-saving rules.

All 50 states ↑

State guideTexasMost of Texas uses Central Time; far West Texas uses Mountain Time.→ State guideArizonaMost of Arizona stays on MST year-round; the Navajo Nation observes seasonal daylight saving time.→ State guideCaliforniaPacific Time statewide.→ State guideFloridaMost of Florida uses Eastern Time; part of the western Panhandle uses Central Time.→ State guideMichiganMost of Michigan uses Eastern Time; part of the Upper Peninsula uses Central Time.→ State guideIndianaMost of Indiana uses Eastern Time; several counties use Central Time.→ State guideNew YorkEastern Time statewide.→ State guideHawaiiHawaii uses HST year-round and does not observe daylight saving time.→

U.S. Territories & Federal Time Zones

Territories explain why federal references count nine U.S. time zones rather than only the six families used by the 50 states.

Atlantic Standard TimeAST · UTC−04:00Puerto Rico and the U.S. Virgin Islands · no DST

Samoa Standard TimeSST · UTC−11:00American Samoa · no DST

Chamorro Standard TimeChST · UTC+10:00Guam and Northern Mariana Islands · no DST

Why U.S. Time Zone Boundaries Split States

U.S. time-zone boundaries are legal boundaries, not simple longitude bands. They can follow county lines and other geographic features, which is why states such as Florida, Idaho, Indiana, Kentucky, Tennessee and Texas can contain more than one zone.

The U.S. Department of Transportation oversees standard-time boundaries under federal law. For a location near a boundary, use the detailed state guide or the visual U.S. map rather than assuming one zone applies statewide.

Open U.S. Time Zone Map

What a Time Zone Tells You

Zone familyEastern, Central, Mountain, Pacific, Alaska or Hawaii–Aleutian describes the broad U.S. civil-time family.

AbbreviationThe current label can change seasonally, such as EST → EDT or PST → PDT.

UTC offsetThe current numerical relationship to UTC can change when a location enters or leaves daylight saving time.

IANA zoneA location-based identifier such as America/New_York carries the civil-time rules used to calculate the correct offset for a date.

Compare U.S. Time Zones Right Now

Choose two representative U.S. zone families to see the live time difference. For a specific city, state exception or future date, open the full comparison tool.

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Compare Any Two Time Zones Convert a Specific Time

Visual boundaries

Prefer a U.S. Time Zone Map?

The state directory answers reference questions. For geographic boundaries, split states and a visual overview of where the zones change, use the dedicated U.S. Time Zone Map.

View U.S. Time Zone Map

Use the specialized tool for the next task instead of forcing every time-zone question into one page.

Time ZonesGlobal time-zone reference hub. DST by StateState-by-state daylight-saving reference. Time Zone ChartSearchable world time-zone reference table. What Time Is It?Current-time tools and world clocks.

Sources & Methodology

CalendarHours separates legal U.S. time-zone geography from date-aware civil-time calculations. Boundary questions use U.S. federal sources, while current abbreviations and offsets are calculated from the IANA time-zone rules available to the browser.

Primary boundary source

U.S. Department of Transportation / BTS

The Bureau of Transportation Statistics publishes a digital representation of the official standard-time boundaries defined in 49 CFR Part 71. It is the primary reference for where federal U.S. zone boundaries are drawn.

DST operational source

NIST & U.S. DOT

NIST publishes the federal daylight-saving schedule. U.S. DOT explains the Uniform Time Act framework and the jurisdictions that do not observe DST.

Date-aware calculations

IANA Time Zone Database

IANA rules are used conceptually for civil-time transitions, UTC offsets and daylight-saving changes. CalendarHours avoids treating current offsets as permanent properties of a zone.

Bureau of Transportation Statistics — History of Time Zones and DST U.S. Department of Transportation — Daylight Saving Time NIST — Daylight Saving Time Rules U.S. Naval Observatory — U.S. Time Zones IANA — Time Zone Database

Methodology note: State rows summarize zone membership for discovery. Exact boundary questions belong to the detailed state guide and, when a geographic view is needed, the U.S. Time Zone Map. Current time, abbreviations and offsets are date-aware and should not be interpreted as fixed year-round values.

U.S. Time Zones FAQ

Fast answers to the questions that cause the most confusion about U.S. time zones, states and daylight saving time.

How many time zones are in the U.S.?

It depends on scope. The contiguous United States has four primary time zones: Eastern, Central, Mountain and Pacific. The 50 states use six time-zone families when Alaska and Hawaii–Aleutian are included. Federal references count nine zones when U.S. territories are included.

What are the four time zones in the contiguous United States?

Eastern Time, Central Time, Mountain Time and Pacific Time are the four primary time-zone families used across the contiguous 48 states.

What are the six time zones used by the 50 states?

Eastern, Central, Mountain, Pacific, Alaska and Hawaii–Aleutian are the six standard time-zone families used by the 50 states.

Why do some sources say the U.S. has nine time zones?

Federal U.S. references include territories. In addition to the six state-zone families, Atlantic, Samoa and Chamorro standard-time zones cover U.S. territories, bringing the federal count to nine.

Which U.S. states have more than one time zone?

Alaska, Florida, Idaho, Indiana, Kansas, Kentucky, Michigan, Nebraska, North Dakota, Oregon, South Dakota, Tennessee and Texas span more than one official time-zone family.

What time zone is Florida in?

Most of Florida uses Eastern Time, while part of the western Panhandle uses Central Time. Open the Florida Time Zone guide for the detailed boundary.

What time zone is Texas in?

Most of Texas uses Central Time. Far West Texas uses Mountain Time. The detailed Texas Time Zone guide explains the boundary and current date-aware offsets.

Does Arizona observe daylight saving time?

Most of Arizona does not observe daylight saving time and remains on Mountain Standard Time year-round. The Navajo Nation is a major exception and does observe DST.

Does Hawaii observe daylight saving time?

No. Hawaii uses Hawaii Standard Time year-round and does not observe daylight saving time.

What is the difference between ET, EST and EDT?

ET is the umbrella term Eastern Time. EST is Eastern Standard Time at UTC−05:00. EDT is Eastern Daylight Time at UTC−04:00. A location that observes seasonal clock changes can alternate between EST and EDT during the year.

Who decides U.S. time-zone boundaries?

The U.S. Department of Transportation oversees standard-time zone boundaries under federal law. Official written boundaries are defined in 49 CFR Part 71.

Where can I see a U.S. time-zone map?

Use the U.S. Time Zone Map for a visual view of time-zone geography, split states and boundary context.