Most countries fit neatly within a single time zone. But the world's largest nations — those spanning thousands of kilometres from east to west — present a challenge: should a country use a single unified clock, or multiple regional times? Different countries have answered this question very differently.
Russia: 11 Time Zones
Russia spans the greatest continuous east-west distance of any country on Earth, stretching from Kaliningrad on the Baltic Sea to the Chukchi Peninsula facing Alaska — a span of 10,000 km. The result is 11 official time zones, ranging from UTC+2 (Kaliningrad) to UTC+12 (Kamchatka, Chukotka).
Russia abolished Daylight Saving Time in 2014, so all 11 zones now use fixed, year-round offsets. Moscow observes MSK (Moscow Standard Time, UTC+3) year-round — a reference point for the entire country, since official schedules (railway times, television broadcasts) are often given in "Moscow time."
United States: 6 Main Zones
The contiguous United States uses four time zones: Eastern, Central, Mountain, and Pacific. Add Alaska and Hawaii, and the total reaches six. Including overseas territories (Puerto Rico, the US Virgin Islands, Guam, American Samoa, and others), the USA spans 11 time zones in total.
| Zone | Standard (Winter) | DST (Summer) | States |
|---|---|---|---|
| Eastern | UTC-5 (EST) | UTC-4 (EDT) | NY, FL, GA, OH… |
| Central | UTC-6 (CST) | UTC-5 (CDT) | TX, IL, MN… |
| Mountain | UTC-7 (MST) | UTC-6 (MDT) | CO, AZ*, NM… |
| Pacific | UTC-8 (PST) | UTC-7 (PDT) | CA, WA, OR… |
| Alaska | UTC-9 (AKST) | UTC-8 (AKDT) | AK |
| Hawaii-Aleutian | UTC-10 (HST) | UTC-9* | HI, western AK islands |
*Arizona does not observe DST (with the exception of the Navajo Nation), staying at MST (UTC-7) year-round.
Canada: 6 Time Zones
Canada spans six time zones, from Newfoundland Time (UTC-3:30 — a rare 30-minute offset) to Pacific Time (UTC-8) in British Columbia. Toronto, Montreal, and Ottawa observe Eastern Time; Vancouver observes Pacific Time, matching Los Angeles.
Australia: 3 Main Zones
Australia uses three main time zones: AEST (UTC+10, eastern states), ACST (UTC+9:30, South Australia and Northern Territory — another 30-minute offset), and AWST (UTC+8, Western Australia). Sydney and Melbourne observe AEST/AEDT, switching clocks in October and April for the Southern Hemisphere summer.
China: One Zone Across Five
Despite stretching across five theoretical time zones, China officially uses a single national time: CST (China Standard Time, UTC+8). This was imposed in 1949 by the People's Republic to promote national unity. In practice, the westernmost region of Xinjiang informally observes "Xinjiang Time" (UTC+6) in daily life, creating a parallel unofficial clock running alongside the official one.
The result is that sunrise in Kashgar, in western Xinjiang, occurs at what the official clock shows as 10:00 AM in winter — a significant mismatch with natural daylight.
Indonesia: 3 Time Zones
Indonesia spans three time zones across its 17,000+ islands: WIB (UTC+7, western islands including Java and Jakarta), WITA (UTC+8, central islands), and WIT (UTC+9, eastern islands including Papua).
Brazil: 4 Time Zones
Brazil uses four time zones. Most of the country, including São Paulo and Rio de Janeiro, observes BRT (UTC-3). Brazil officially abolished Daylight Saving Time in 2019.
France: 12 Time Zones (Including Overseas Territories)
France holds a special record: with its overseas territories spread across the globe — from French Polynesia in the Pacific to Reunion Island in the Indian Ocean to French Guiana in South America — France technically covers 12 different UTC offsets, more than any other country. Metropolitan France uses just one (CET/CEST, UTC+1/+2).
Frequently Asked Questions
Which country has the most time zones?
France, counting its overseas territories, observes 12 different UTC offsets. Russia has the most time zones within a contiguous territory — 11 zones from UTC+2 to UTC+12.
How many time zones does the USA have?
Six main zones (Eastern through Hawaii-Aleutian) plus five more in territories, totalling 11 UTC offsets across all US-administered lands.
Why does China only have one time zone?
China imposed a single national time (UTC+8) in 1949 for national unity and administrative simplicity. Xinjiang informally uses UTC+6 in daily life despite the official single-zone policy.
How many time zones does Russia have?
Russia has 11 official time zones, from UTC+2 in Kaliningrad to UTC+12 in Kamchatka, all with fixed offsets since DST was abolished in 2014.