France has the most officially recognized time zones when its overseas territories are counted.
France spans 12 standard time zones across metropolitan France and its overseas territories. For part of the year, the number can be counted as 13 because Saint-Pierre and Miquelon observes daylight saving time while most French territories do not. These territories are scattered across the Atlantic, Pacific and Indian oceans, so French jurisdictions experience a wide range of local times.
Russia covers the greatest continuous east-to-west land span and has 11 time zones. The United States also has multiple zones because of Alaska, Hawaii and territories, but its total is lower under the usual counting method. China, despite its huge width, officially uses only one time zone: China Standard Time.
The answer depends on whether overseas territories are included and whether seasonal clock changes are counted. In the standard geographic trivia formulation that includes overseas France, France is the recognized leader.