[1] The electrical telegraph was introduced in Switzerland in 1851, which allowed near real-time communication, especially amongst post offices.
[8] This resulted in there being a one-hour time difference between Switzerland and most of Western Europe, including all of the bordering countries (with the exception of Liechtenstein) for around six months in 1980.
[citation needed] The German village of Büsingen am Hochrhein, a small exclave, entirely surrounded by Swiss territory, did not implement DST in 1980 either and observed the same time as Switzerland, meaning there was a one-hour time difference between this village and the rest of Germany.
The zone Europe/Busingen was created in the 2013a release of the tz database,[9] because since the Unix time epoch in 1970, Büsingen has shared clocks with Zurich.
[10] Since 1981 the shifts to DST occur on the date as specified for European Summer Time.