Switzerland uses Central European Time (CET), which is UTC+1 during Standard Time, and Central European Summer Time (CEST), UTC+2, during Daylight Saving Time.

Yes, Switzerland observes Daylight Saving Time. The clocks are set forward by 1 hour in the summer, shifting from UTC+1 (CET) to UTC+2 (CEST).

The time difference between Switzerland and the United States varies depending on the U.S. time zone. For example, Switzerland is 6 hours ahead of Eastern Standard Time (EST) and 9 hours ahead of Pacific Standard Time (PST). During Daylight Saving Time, Switzerland is 5 hours ahead of EST and 8 hours ahead of PST.

Yes, Switzerland shares its time zone (CET/CEST) with many other Central European countries, including Germany, France, Italy, and Spain. This time zone is common across much of Europe.