Which Country Has the Most Time Zones?

France wins by a wide margin, not because of its geography in Europe, but because of its overseas territories scattered across every ocean on earth. Metropolitan France in Western Europe uses CET (UTC+1) in winter and CEST (UTC+2) in summer. But the French Republic also includes:

• French Guiana — South America, UTC-3
• Martinique and Guadeloupe — Caribbean, UTC-4
• Saint Pierre and Miquelon — near Canada, UTC-3
• French Polynesia — South Pacific, UTC-10 (Tahiti) and UTC-9:30 (Marquesas Islands)
• Wallis and Futuna — South Pacific, UTC+12
• New Caledonia — South Pacific, UTC+11
• Réunion — Indian Ocean, UTC+4
• Mayotte — Indian Ocean, UTC+3
• Scattered Islands and French Southern Territories — various offsets

France's 12 time zones span nearly the entire 24-hour clock — from UTC-10 in French Polynesia to UTC+12 in Wallis and Futuna. The French Republic has the largest exclusive economic zone (EEZ) in the world, and this maritime empire is precisely why a country whose mainland fits comfortably between UTC+1 and UTC+2 officially governs territory in a dozen different time zones.

Russia holds the record for the most time zones of any single contiguous landmass. The country stretches from Kaliningrad on the Baltic Sea (UTC+2) to the Chukotka and Kamchatka peninsulas on the Pacific (UTC+12) — a span of 10 hours across land alone.

The eleven Russian time zones are: Moscow Time (MSK, UTC+3), which is used as the reference for Russian domestic schedules, is not actually the westernmost — Kaliningrad is UTC+2. At the far east, Kamchatka (UTC+12) and Chukotka (UTC+12) are so far east that they are actually to the west of the International Date Line.

Russia's vast east-west extent means that when it is Monday morning in Moscow, it is already Tuesday morning in Kamchatka. This has practical consequences for governance, broadcasting, and financial markets — the Moscow Stock Exchange opens at a time when parts of Russia are already in the next calendar day.

The contiguous 48 states span four time zones: Eastern (EST/EDT, UTC-5/-4), Central (CST/CDT, UTC-6/-5), Mountain (MST/MDT, UTC-7/-6), and Pacific (PST/PDT, UTC-8/-7). Alaska adds AKST (UTC-9), and Hawaii uses HST (UTC-10) without observing Daylight Saving Time.

US territories add further diversity: Puerto Rico and the US Virgin Islands use AST (UTC-4), Guam and the Northern Mariana Islands use ChST (UTC+10), American Samoa uses SST (UTC-11), and the US Minor Outlying Islands include Wake Island (UTC+12). Counting all territories, the United States spans from UTC-12 (Baker and Howland Islands, uninhabited) to UTC+12 — the widest possible span.

Australia (5 zones) is notable for its unusual half-hour and quarter-hour offsets. The standard zones are AWST (UTC+8), ACWST (UTC+8:45, used only in the Eucla region of Western Australia — one of the world's most obscure time zones), ACST (UTC+9:30), AEST (UTC+10), and LHST (UTC+10:30 for Lord Howe Island). During daylight saving, most eastern states shift to AEDT (UTC+11), while South Australia uses ACDT (UTC+10:30).

Canada (6 zones) spans from NST (UTC-3:30, Newfoundland — another unusual half-hour offset) to PST (UTC-8). Canada's eastern provinces include Atlantic Time (UTC-4), and the territory of Saskatchewan famously does not observe DST, remaining at CST (UTC-6) year-round.

Brazil (4 zones) ranges from UTC-5 in the western Amazon to UTC-2 for the Fernando de Noronha archipelago, with most of the country on BRT (UTC-3).

Perhaps more remarkable than countries with many time zones are the large countries that use just one — a political choice that sacrifices geographic accuracy for administrative simplicity.

China spans five natural time zones — from UTC+5 in Xinjiang to UTC+9 in the easternmost provinces — yet officially uses a single Beijing Standard Time (CST, UTC+8) for the entire country. In Xinjiang, the westernmost province, the sun does not rise until 10 AM by official clock time in winter, and sunset comes at 10 PM in summer. An informal "Xinjiang Time" (UTC+6) is widely used by the Uyghur population.

India also uses a single time zone — IST (UTC+5:30) — for its entire 3,000 km east-west span. The half-hour offset was a deliberate choice to split the difference between the natural times of the country's eastern and western extremes.

Most time zones are whole-hour offsets from UTC. But a surprising number of places use 30-minute or even 15-minute offsets:

• UTC+5:45 — Nepal Standard Time (NST). Nepal is the only country in the world to use a 45-minute offset. The reason is geographic: Nepal wanted to differentiate itself from India (UTC+5:30) and Bangladesh (UTC+6) without adopting either neighboring time.
• UTC+5:30 — India and Sri Lanka. The half-hour offset was adopted to cover the country's longitude range without the disruption of two separate zones.
• UTC+8:45 — Eucla, Western Australia (ACWST). A tiny region along the Nullarbor Plain where the local community informally adopted a time halfway between the Western Australian (UTC+8) and South Australian (UTC+9:30) standards.
• UTC+12:45 — Chatham Islands, New Zealand. The Chatham Islands are 800 km east of New Zealand's South Island and use CHAST (UTC+12:45 standard, UTC+13:45 daylight saving) — the most unusual offset in the southern hemisphere.
• UTC+9:30 — Australia's Northern Territory and South Australia (ACST). While not a half-hour from UTC per se, it represents a genuine mid-zone compromise between Eastern (UTC+10) and Western (UTC+8) Australia.