If you count everything, including overseas territories, then France claims the title by covering 12 time zones. The United States would be the runner-up with 11 and then Russia with 9.

Metropolitan France uses Central European Time (heure d'Europe centrale, HEC: UTC+01:00) and Central European Summer Time (heure d'été d'Europe centrale: UTC+02:00). Daylight saving time is observed in Metropolitan France from the last Sunday in March (02:00 CET) to the last Sunday in October (03:00 CEST). With its overseas territories, France uses 12 different time zones, the most of any country in the world.

More Info: en.wikipedia.org