How Many Time Zones Are There in the World?
By WordTimezone · Updated October 7, 2026 · 3 min read
The tidy answer is 24: the Earth turns 360° in a day, so it divides into 24 zones of 15° of longitude each, one hour apart. The real answer is messier. Reading the IANA time zone database for January 15 and July 15, 2026, there are 39 different UTC offsets in use, from UTC−11 to UTC+14 — and 418 named IANA time zones, because countries have changed their rules at different moments in history.
Why there are more than 24
Three things push the number past 24:
- Half-hour and 45-minute offsets. Several countries sit 30 or 45 minutes off a whole-hour offset, so each adds an extra offset.
- Daylight saving. A place that moves its clocks uses two offsets over the year; the 39 counted here include both the winter and the summer values.
- Politics, not geography. Governments pick the zone that suits trade and daily life, so borders often matter more than longitude.
The “odd” offsets (not a whole number of hours)
| Place | IANA zone | UTC offset (Jan / Jul) |
|---|---|---|
| Marquesas Islands (French Polynesia) | Pacific/Marquesas | UTC−9:30 |
| Newfoundland, Canada (St. John’s) | America/St_Johns | UTC−3:30 / UTC−2:30 |
| Iran (Tehran) | Asia/Tehran | UTC+3:30 |
| Afghanistan (Kabul) | Asia/Kabul | UTC+4:30 |
| India and Sri Lanka | Asia/Kolkata | UTC+5:30 |
| Nepal (Kathmandu) | Asia/Kathmandu | UTC+5:45 |
| Myanmar (Yangon) | Asia/Yangon | UTC+6:30 |
| Eucla, Western Australia | Australia/Eucla | UTC+8:45 |
| Adelaide, Australia | Australia/Adelaide | UTC+10:30 / UTC+9:30 |
| Lord Howe Island, Australia | Australia/Lord_Howe | UTC+11 / UTC+10:30 |
| Chatham Islands, New Zealand | Pacific/Chatham | UTC+13:45 / UTC+12:45 |
Offsets read from the IANA time zone database for January 15 and July 15.
India’s UTC+5:30 is the most widely used of them: one offset covers roughly one in six people on Earth. See India Standard Time explained.
How many zones does a country have?
- One zone for a huge country: India (UTC+5:30) and China (UTC+8) each use a single official time across very wide territories.
- Many zones: Russia spans 11 time zones, and the United States has six main ones plus its territories (see US time zones explained).
- Overseas territories add up: France spans more time zones than any other country when its overseas territories are counted.
The extremes
Nominally the time zones run from UTC−12 (Baker Island, uninhabited) to UTC+14 (the Line Islands of Kiribati). The IANA list of inhabited places reaches from UTC−11 to UTC+14. Because of the International Date Line, parts of the Pacific that are only a short sail apart can be a full day apart — Samoa even skipped 30 December 2011 when it moved across the line.
America/New_York is not an offset — it is a place with a history of offsets. That is why programmers store zones by name. Browse them all in the IANA time zone list.Frequently asked questions
How many time zones are there in the world?
There are 24 nominal zones one hour apart, but 39 different UTC offsets are in use in the IANA database (January and July 2026), ranging from UTC−11 to UTC+14.
Why are some time zones 30 or 45 minutes off?
Governments chose offsets that match local solar time or a neighbour’s clock. India (UTC+5:30), Iran (UTC+3:30), Nepal (UTC+5:45) and the Chatham Islands (UTC+12:45) are examples.
Which country has the most time zones?
France, when its overseas territories are counted. Among countries with a contiguous territory, Russia has the most, at 11.
How many IANA time zones are there?
This site’s list has 418 named IANA time zones. There are far more names than offsets because many regions changed rules at different points in history.