North America Time Zones
The complete guide to time zones across the United States, Canada, and Mexico — live UTC offsets, DST schedules, country clocks, anomalies like Arizona, history, and practical tools.
Overview: Time in North America
North America spans an extraordinary longitudinal range — from the easternmost tip of Newfoundland (roughly 52°W) to the western edge of Alaska's Aleutian Islands (beyond 172°W). This stretch of over 120 degrees of longitude makes the continent one of the most time-zone-complex landmasses on Earth, producing six primary civil time zones for the contiguous region alone, with additional zones for Alaska, Hawaii, and several island territories.
Unlike Europe, where three dominant zones cover most of the continent, North America's time zones are tightly tied to the political boundaries of individual US states, Canadian provinces, and Mexican states. The result is a system that is broadly rational but full of local exceptions: Arizona observes no Daylight Saving Time (except the Navajo Nation), Saskatchewan stays on CST year-round, and the Navajo Nation within Arizona does observe DST while the Hopi Reservation entirely surrounded by it does not.
The United States and Canada observe Daylight Saving Time (DST) from the second Sunday of March to the first Sunday of November — a schedule that has been in effect since the Energy Policy Act of 2005. Mexico simplified its DST regime significantly in 2022 when Congress voted to abolish DST nationwide, with most of Mexico now permanently on standard time. The border regions of Baja California retained their own arrangement to stay aligned with California.
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The Six Main Time Zones of North America
The green chips show the currently active UTC offset, computed live from your browser clock and updated every minute.
Eastern Time — ET UTC−5 / UTC−4 DST
Eastern Time is the most populous time zone in North America, covering roughly half the US population. In winter it is EST (UTC−5); during DST (second Sunday of March to first Sunday of November) it advances to EDT (UTC−4). The zone runs from the Atlantic coast westward through the Appalachian states and into Indiana (most of which opted into ET). Major cities: New York, Boston, Washington D.C., Miami, Atlanta, Detroit, Toronto, Montreal, Ottawa.
Central Time — CT UTC−6 / UTC−5 DST
Central Time spans the geographic heartland of North America, from the Gulf of Mexico through the Great Plains and into central Canada. In winter it is CST (UTC−6); during DST it advances to CDT (UTC−5). Saskatchewan (Canada) is a permanent exception — the province observes CST year-round without ever switching to CDT. Major cities: Chicago, Dallas, Houston, Kansas City, Minneapolis, New Orleans, Nashville, Winnipeg, Guadalajara (Mexico).
Mountain Time — MT UTC−7 / UTC−6 DST
Mountain Time covers the Rocky Mountain states of the US and the adjacent Canadian and Mexican regions. In winter it is MST (UTC−7); during DST it advances to MDT (UTC−6). Arizona is the major exception: the state permanently observes MST (UTC−7) year-round — effectively placing it on the same offset as Pacific Daylight Time during summer. The Navajo Nation within Arizona does follow MDT. Major cities: Denver, Salt Lake City, Phoenix (year-round MST), Albuquerque, El Paso, Calgary, Edmonton.
Pacific Time — PT UTC−8 / UTC−7 DST
Pacific Time covers the US West Coast and most of British Columbia. In winter it is PST (UTC−8); during DST it advances to PDT (UTC−7). Major cities: Los Angeles, San Francisco, Seattle, Portland, Las Vegas, Vancouver. During summer, Pacific Daylight Time (UTC−7) equals Arizona's permanent MST — a recurring source of scheduling confusion for travellers and remote workers.
Alaska Time — AKT UTC−9 / UTC−8 DST
Alaska Time covers most of the state of Alaska. In winter it is AKST (UTC−9); during DST it advances to AKDT (UTC−8). The far western Aleutian Islands (west of 169°30'W) use Hawaii–Aleutian Time (HAST/HADT) instead. Major cities: Anchorage, Fairbanks, Juneau. Alaska has been petitioning Congress to move to UTC−8 permanently to gain more afternoon daylight.
Hawaii–Aleutian Time — HAT UTC−10 (permanent)
Hawaii permanently observes HAST (UTC−10) with no DST whatsoever. Hawaii's latitude (roughly 20°N) means daylight hours vary relatively little across the year — making seasonal adjustment pointless and legally unnecessary. Hawaii has not observed DST since 1967. The western Aleutian Islands follow the same HAST offset in winter but advance to HADT (UTC−9) during DST — an anomaly not shared with Honolulu. Major cities: Honolulu.
Countries, Zones & UTC Offsets — Reference Table
All major North American time zones and sub-regions. The Active Now column shows the live current UTC offset for each zone, computed from your browser clock and updated every minute. For full worldwide coverage: GMT/UTC Countries · World Time Zones List.
| Zone / Region | Major City | Standard (Winter) | Summer (DST) | Active Now | IANA Zone | DST? |
|---|
* "Active Now" is computed via Intl.DateTimeFormat using each region's IANA timezone identifier — updated every minute. DST in the US and Canada runs from the second Sunday of March to the first Sunday of November. Arizona (except Navajo Nation), Saskatchewan, and Hawaii observe no DST. Most of Mexico abolished DST in 2022; Baja California retained DST alignment with California.
Live Clocks for Every North American Zone
Current local time across all major North American time zones, auto-refreshed every second. UTC offsets and Summer/Standard labels update automatically — zero hardcoded values. For worldwide coverage, explore our World Clock.
⏱ Clocks use Intl.DateTimeFormat with IANA timezone identifiers. All times, UTC offsets, and seasonal labels are fully dynamic — zero hardcoded values.
Daylight Saving Time in North America
The United States and Canada share the same DST schedule: clocks spring forward at 2:00 a.m. local time on the second Sunday of March, and fall back at 2:00 a.m. local time on the first Sunday of November. This schedule has been in place since the Energy Policy Act of 2005 (USA), which extended DST by four weeks compared to the previous schedule. Canada followed the US change. Learn more in the complete Daylight Saving Time guide.
How the US/Canada DST schedule works
Every zone in the contiguous US and Canada shifts by exactly one hour forward in spring and one hour back in autumn — simultaneously within each zone at 2:00 a.m. local time. Because each zone changes at its own local 2:00 a.m., the transitions are staggered by wall-clock time but conceptually simultaneous in local experience. The US rule applies to all states except Arizona and Hawaii; Canada's rule applies to all provinces and territories except Saskatchewan. See Standard Time for context on what standard (winter) time represents.
United States — DST Schedule
Most of the US observes DST under the Uniform Time Act (1966) as amended by the Energy Policy Act (2005). The change runs from second Sunday of March (02:00 local → 03:00) to first Sunday of November (02:00 local → 01:00). All six main US zones shift simultaneously at their own local 2:00 a.m. Exceptions: Arizona (permanent MST, UTC−7) and Hawaii (permanent HAST, UTC−10). The US Senate passed the Sunshine Protection Act in 2022 to make DST permanent, but the bill never cleared the House.
Canada — DST Schedule
Canada follows the same second-Sunday-of-March / first-Sunday-of-November schedule as the United States, adopted to maintain cross-border commerce and scheduling alignment. Most provinces and territories observe DST. Saskatchewan permanently uses CST (UTC−6) year-round — effectively sharing the same clock as CDT during summer. Parts of northeastern British Columbia and some communities in other provinces have local exemptions. Yukon switched to permanent MST (UTC−7) in 2020.
Mexico — DST Abolished (2022)
Mexico's Congress voted to abolish DST nationwide in October 2022, with the change taking effect from spring 2023 — clocks were not advanced in March 2023. The vast majority of Mexico — including Mexico City, Guadalajara, Monterrey, and all states on Central Time — now observes permanent standard time year-round. The sole exception: Baja California retains DST to remain aligned with California (Pacific Time), as the two regions have deeply integrated economies. This makes Baja California the only Mexican state that still changes clocks.
Hawaii, Puerto Rico & Territories
Hawaii has not observed DST since 1967 and is permanently on HAST (UTC−10). US territories including Puerto Rico, the US Virgin Islands (both UTC−4 permanent), Guam (UTC+10 permanent), American Samoa (UTC−11 permanent), and the Northern Mariana Islands (UTC+10 permanent) do not observe DST. These territories are outside the contiguous US and do not follow the Uniform Time Act DST provisions.
Exceptions & Non-DST Zones
North America's DST map is complicated by a patchwork of state, provincial, and tribal exceptions. Here are the most significant ones:
🌵 Arizona — Permanent MST (UTC−7)
Arizona is the only contiguous US state that does not observe DST. It permanently uses Mountain Standard Time (MST, UTC−7). The rationale: Arizona's desert climate means residents prefer to avoid extending the hottest part of the day into evening hours. During summer, Arizona shares its clock with Pacific Daylight Time (PDT) — effectively placing Phoenix on the same time as Los Angeles and Las Vegas from March to November. The Navajo Nation, a federally recognised territory that spans Arizona, Utah, and New Mexico, does observe MDT — creating DST-observing territory entirely surrounded by non-DST Arizona. The Hopi Reservation, which is entirely enclosed by the Navajo Nation, does not observe DST — a concentric alternation found nowhere else in the world.
🌾 Saskatchewan — Permanent CST (UTC−6)
The Canadian province of Saskatchewan permanently uses Central Standard Time (CST, UTC−6), never advancing to CDT. This has been the province's practice since 1966 — Saskatchewan voters and legislature have repeatedly rejected DST proposals, citing agricultural scheduling and alignment with Alberta's winter offset. During summer, Saskatchewan shares its clock with CDT (Central Daylight Time), meaning it is on the same time as Chicago and Winnipeg from March to November — without having changed anything.
🍁 Yukon — Permanent MST (UTC−7)
Canada's Yukon territory switched to permanent Mountain Standard Time (MST, UTC−7) on November 1, 2020, effectively adopting permanent PDT. Previously, Yukon had used PST/PDT (Pacific Time). The change was made to reduce the disruption of clock changes. Yukon no longer observes any DST and does not shift clocks in March or November.
🇲🇽 Sonora (Mexico) — Permanent MST (UTC−7)
The Mexican state of Sonora uses permanent Mountain Standard Time (UTC−7), never observing DST. This aligns Sonora with neighbouring Arizona — which also observes permanent MST — facilitating cross-border commerce in the Nogales and Douglas border regions. When the rest of Mexico abolished DST in 2022, Sonora's arrangement became the national standard for the northwestern zone.
🌺 Hawaii — Permanent HAST (UTC−10)
Hawaii is permanently on Hawaii–Aleutian Standard Time (HAST, UTC−10) with no seasonal adjustment. Hawaii has not observed DST since 1967. The state's tropical latitude means daylight hours vary only modestly across the year — the difference between the shortest and longest day is less than 2.5 hours, making DST adjustments impractical and unpopular.
🇨🇦 Newfoundland — UTC−3:30 / −2:30
Newfoundland and Labrador use NST (UTC−3:30) in winter and NDT (UTC−2:30) during DST — the only half-hour UTC offset in the Americas. The zone originated from a 1935 Newfoundland Commission of Government decision and survived Confederation with Canada in 1949. Despite periodic proposals to align with Atlantic Time, Newfoundlanders have consistently voted to retain the unique offset as a mark of provincial identity.
History of North American Time Zones
Before standardised railway time, every American city kept its own local solar time. The United States alone had hundreds of competing local times in the 1860s — a scheduling nightmare for the expanding railway network. The solution came not from government, but from the railroads themselves.
Charles Ferdinand Dowd, an American educator, first proposes dividing North America into hour-wide time zones anchored to 75°W, 90°W, 105°W, and 120°W — the direct predecessors of today's EST, CST, MST, and PST. His proposal is not immediately adopted.
On November 18 — later called "The Day of Two Noons" — the major US and Canadian railroads unilaterally adopt four continental time zones. At noon Eastern time, every city's clocks are reset simultaneously. The US government does not legally mandate this; it is a private-sector coordination. Local governments gradually follow.
The International Meridian Conference in Washington D.C. designates Greenwich as the global Prime Meridian. North America's four railway zones are now formally anchored to GMT−5, GMT−6, GMT−7, and GMT−8.
The Standard Time Act is signed into law — the first US federal legislation codifying the four time zones and establishing the first nationwide Daylight Saving Time. DST was introduced as a wartime measure to conserve coal. The act is unpopular in rural areas; Congress repeals mandatory DST in 1919, leaving it to individual states and cities.
President Roosevelt institutes War Time — year-round DST across the entire United States during World War II. Clocks are advanced one hour and kept there for the duration, labelled "Eastern War Time," "Central War Time," and so on.
The Uniform Time Act establishes a national US DST schedule: last Sunday of April (spring forward) to last Sunday of October (fall back). States may opt out by state law. Arizona exercises this opt-out; Indiana takes a complicated series of county-by-county exceptions until standardising on Eastern Time in 2006.
The Emergency Daylight Saving Time Energy Conservation Act extends DST to a near-year-round schedule during the 1973 oil crisis. Clocks stay forward from January to November in 1974. The experiment is controversial — dark winter mornings cause increased school-bus accidents, and energy savings are modest.
DST extended by three weeks: spring-forward moved from last Sunday of April to first Sunday of April. Both the US and Canada adopt this change to align cross-border timing.
The Energy Policy Act of 2005 shifts US DST to its current schedule: second Sunday of March (spring forward) through first Sunday of November (fall back). The change adds four weeks of DST annually. Canada follows in 2007. The EU retains the last-Sunday-of-March standard, creating a 2–3 week annual window of divergence with North America.
Canada's Yukon territory permanently adopts Mountain Standard Time (UTC−7), eliminating clock changes. Several US states — California (Proposition 7, 2018), Washington, Oregon, and Florida — pass legislation to make DST permanent, contingent on federal approval. Congress has not acted.
The US Senate unanimously passes the Sunshine Protection Act in March, which would make DST permanent across the US. The bill passes the House Energy Committee but does not receive a House floor vote. Mexico's Congress independently votes to abolish DST nationwide (October 2022), with most Mexican states switching to permanent standard time. Baja California retains DST.
The US and Canada continue bi-annual clock changes. Congressional and provincial proposals for permanent time persist but have not been enacted. Use the Time Zone Converter and Time Zone Map for current offsets.
Geography & Time Zone Anomalies
North America's time zone map follows a broadly rational longitude-based pattern — but political boundaries, state decisions, and historical accidents have produced several notable anomalies.
The Arizona Puzzle: Three DST Realities in One State
Within the state of Arizona, three simultaneous DST realities exist from March to November. The state of Arizona uses permanent MST (UTC−7). The Navajo Nation, which covers a large portion of northeastern Arizona plus parts of Utah and New Mexico, observes MDT (UTC−6) during DST. The Hopi Reservation, entirely enclosed within the Navajo Nation in Arizona, uses permanent MST like the state — not MDT like the surrounding Navajo Nation. A driver travelling through this region can change their clocks twice in a single day without crossing a state line.
Alaska's Geographic Compression
Alaska covers over 586,000 square miles and spans roughly 57 degrees of longitude — more than the entire contiguous 48 states combined. By strict solar time, Alaska should use at least 4 time zones. Instead, nearly all of Alaska uses a single zone (AKST/AKDT, UTC−9/−8), compressing what would naturally be a range of UTC−5 to UTC−12 into one political unit. Only the western Aleutian Islands use a different zone (HAST/HADT, UTC−10/−9).
Indiana's Long Road to Uniformity
Indiana was one of North America's most complex time zone situations for decades. From 1966 through 2005, different Indiana counties observed different time zones and DST rules — some on Eastern Standard time year-round, others switching with Eastern Daylight Time, and two counties in the northwest and southwest on Central Time. The chaos ended on April 2, 2006, when Indiana unified entirely on Eastern Time with standard US DST. The two Chicago-metro northwestern counties and two southwestern counties near Evansville retained Central Time.
El Paso and West Texas: Eastern New Mexico Alignment
El Paso, Texas sits at roughly 106°W longitude — geographically in the Mountain Time zone. However, El Paso and several surrounding West Texas counties observe Mountain Time rather than Central Time (which covers the rest of Texas). This alignment with New Mexico and the Mountain Zone reflects strong economic and social ties with the Albuquerque and Las Cruces corridors rather than with Dallas or Houston.
British Columbia's Eastern Fringe
The northeastern corner of British Columbia — the Peace River region — observes Mountain Time rather than the Pacific Time used by the rest of the province. This area's economy is closely tied to Alberta, and its communities align their clocks with Edmonton and Calgary rather than Vancouver. This creates a geographic situation where driving west from Alberta into northeastern BC does not require a clock adjustment, while driving further west eventually crosses into Pacific Time.
Newfoundland's UTC−3:30: The Americas' Only Half-Hour Zone
Newfoundland and Labrador use UTC−3:30 — the only half-hour UTC offset in the Western Hemisphere. Its historical origin lies in Newfoundland's status as an independent Dominion from 1907 to 1949; when it joined Canada, it retained its own time zone rather than adopting Atlantic Time (UTC−4). The offset is exactly 30 minutes ahead of Atlantic Standard Time and creates a distinctive scheduling edge for anyone doing business between St. John's and the mainland.
Interesting Facts & Curiosities
New York and Los Angeles are exactly 3 hours apart — always
Eastern Time and Pacific Time always maintain a 3-hour gap throughout the year, because both zones shift by the same amount on the same dates. When New York springs forward to EDT (UTC−4), Los Angeles simultaneously springs forward to PDT (UTC−7). The gap never closes or widens — unlike the NY-London or NY-Paris gap, which fluctuates by 1 hour during the 2–3 week annual DST divergence windows.
During US summer, Arizona clocks equal Pacific Daylight Time
Arizona permanently observes MST (UTC−7). From the second Sunday of March through the first Sunday of November, Pacific Time is on PDT (UTC−7) — the same offset. This means that during this window, Los Angeles and Phoenix show the same time, despite Los Angeles being roughly 400 miles west and nominally one time zone away. Business travellers between the two cities regularly forget about the clock change in winter.
Standard time zones were invented by railway managers, not governments
The four time zones of North America were created on November 18, 1883 by the General Time Convention — an association of railway managers, not a government body. The US federal government did not legally codify time zones until the Standard Time Act of 1918 — a full 35 years after the railroads had already made them the practical standard. Canada passed equivalent legislation at the same time. The "Day of Two Noons" preceded any legal requirement for the change.
The Sunshine Protection Act: DST made permanent?
The US Senate passed the Sunshine Protection Act of 2022 unanimously — a rare feat in the divided chamber. The bill would have made DST permanent from 2023, eliminating the autumn "fall back." However, the House of Representatives did not bring it to a floor vote before the session ended, and the bill expired. It has been reintroduced in subsequent sessions but has not passed. Multiple states have passed contingent legislation ready to activate if federal law changes.
The shortest DST window in North America: 1 week in autumn
Each autumn, there is a one-week window (typically late October / early November) when the US and Canada have already fallen back to standard time, but European countries have not yet done so — or have done so one week earlier. During this week, the time difference between New York and London shifts to 4 hours instead of the usual 5. Similarly, in spring there is a 2–3 week window where the US has already sprung forward but the EU has not yet.
Hawaii is closer to Japan than to New York — but on UTC−10
Honolulu, Hawaii sits at roughly 158°W longitude and is geographically closer to Tokyo (5,095 miles) than to New York (5,095 miles). Yet Hawaii uses UTC−10, placing it 19 hours behind Japan (UTC+9) — one of the widest bilateral time gaps between a state and a major trading partner. Hawaii's standard time aligns it with American business hours rather than its closest Pacific neighbours, reflecting its integration with the US mainland economy.
Practical Examples & Time Differences
Use our Time Zone Converter for real-time calculations. Examples below use standard (winter) offsets unless noted. Remember: during US DST (second Sunday March – first Sunday November), gaps with Europe shift by 1 hour for 2–3 weeks.
🕐 New York → Los Angeles
EST (UTC−5) vs PST (UTC−8)
Los Angeles is always 3 hours behind New York — in every season — because both shift on the same DST dates. When it's 09:00 in New York, it's 06:00 in LA. A 3 p.m. ET deadline equals noon PT.
🕐 New York → London
EST (UTC−5) vs GMT (UTC+0)
In winter: London is 5 hours ahead. In US summer (after Mar DST, before EU DST): 4 hours. In full summer (both on DST): 5 hours. In the EU-only DST window (EU has fallen back, US hasn't): 6 hours. Use the converter during the transition weeks.
🕐 Chicago → Phoenix
CST (UTC−6) vs Arizona MST (UTC−7, permanent)
In winter: Phoenix is 1 hour behind Chicago. In summer: Chicago advances to CDT (UTC−5), while Phoenix stays at UTC−7 — 2 hours behind. The gap widens in summer due to Arizona's DST opt-out.
🕐 Toronto → Vancouver
EST/EDT (UTC−5/−4) vs PST/PDT (UTC−8/−7)
Vancouver is always 3 hours behind Toronto year-round, as both are on the same DST schedule. A 9 a.m. Toronto meeting is 6 a.m. in Vancouver.
🕐 New York → Mexico City
EST (UTC−5) vs CST (UTC−6, Mexico City — permanent since 2022)
Since Mexico abolished DST in 2022, Mexico City is permanently on UTC−6. In winter: 1 hour behind New York. When the US is on EDT (UTC−4): 2 hours behind. The gap now shifts seasonally because Mexico never changes.
🕐 New York → Tokyo
EST (UTC−5) vs JST (UTC+9)
In winter: Tokyo is 14 hours ahead. In US summer (EDT, UTC−4): 13 hours ahead. Japan never changes clocks. A 9 a.m. New York call is 11 p.m. in Tokyo (winter) — almost certainly outside business hours. Use the converter and consider asynchronous communication.
For European, South American, or African time differences with North America, use the Time Zone Converter.
Frequently Asked Questions
Related Tools & Resources
Explore the full suite of time zone tools and regional guides on TimeTranslator.com — for planning, converting, and understanding time across North America and around the world.