Ask someone which country has the most time zones and they'll say Russia. They'd be wrong. France has 12. Russia has 11.
Metropolitan France — the hexagonal bit in Europe — uses just one time zone. The other 11 come from overseas territories scattered across the globe: French Guiana in South America, Guadeloupe and Martinique in the Caribbean, Réunion near Madagascar, New Caledonia in the Pacific, and several more.
When it's noon in Paris, it's 8am in Martinique, 3pm in Réunion, and 11pm in Tahiti. All technically France.
For comparison, the United States spans 6 time zones (9 if you count territories like Guam and American Samoa). Russia's landmass covers 11, all contiguous.
China is the wildest case. It spans roughly 5 time zones' worth of longitude — from the western border with Afghanistan to the eastern coast. But the entire country runs on a single time zone: Beijing time. When it's noon in Shanghai, it's also officially noon in Kashgar, near the Afghan border — despite the sun not rising there until about 10am.
The UK takes a similar approach to France but with fewer territories, landing at 9 time zones. Australia manages 3 despite being roughly the same width as the continental US.