Time by country: how each nation sets its clock
Each country decides which official time to adopt, and those choices don't always follow geographic logic. This guide explains how time is set by country and why some cases are surprising.
To see the current time of any country and city in real time, use the site's world clock. Here we focus on understanding the rules behind each zone.
How each country sets its official time
In theory, a country's time should follow its longitude relative to UTC. In practice, governments choose the zone for economic, political and trade reasons with neighbors.
That's why a whole country often adopts a single zone even while spanning several longitude bands, to simplify daily life.
Countries with multiple time zones
- United States: uses several continental zones, from UTC-5 (east) to UTC-8 (west), plus Alaska and Hawaii.
- Brazil: has zones from UTC-2 to UTC-5, covering oceanic islands to Acre.
- Russia: the country with the most zones, from UTC+2 to UTC+12.
- Australia: uses three main zones, including one with 30 minutes (UTC+9:30).
Large countries with a single zone
Despite being huge, China uses a single official zone (UTC+8) across the entire territory, by a political decision to unify.
India also adopts a single zone, UTC+5:30, one of the few with a half-hour offset in the world.
Daylight saving around the world
Many countries in Europe and North America move the clock 1 hour in summer to use daylight. Others, like Brazil currently, no longer observe daylight saving.
This makes the difference between two countries change through the year, so always check the date before scheduling international plans.
Quick questions
Why do large countries sometimes have only one zone?
By political and practical decision: a single zone simplifies transport, trade and communication, even if the sun doesn't perfectly track the clock across the territory.
Which country has the most time zones?
Russia, with zones from UTC+2 to UTC+12, is the country with the most zones in continuous use within its territory.
Do all countries use daylight saving?
No. Many countries near the Equator never adopted it, and several others have dropped daylight saving in recent years.
Where can I see a country's current time?
On the site's world clock, which shows the current time of countries and cities in real time.