Switzerland uses a single time zone, denoted as Central European Time (CET: UTC+01:00). Switzerland also observes summer time, shifting to Central European Summer Time (CEST: UTC+02:00).
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Daylight saving time
Since 1981 the shifts to DST occur on the date as specified for the European Summer Time. Before DST was observed in 1941-1942.
Solar time
The difference of longitude between the western and easternmost points of Switzerland is equivalent to 4°32′09″, resulting in a difference of approximately 18 minutes of solar time.
IANA time zone database
The IANA time zone database contains one zone for Switzerland in the file zone.tab, named Europe/Zurich. Columns marked with * are the columns from zone.tab itself.
References
Time in Switzerland Wikipedia(Text) CC BY-SA