Germany observed Central European Time (CET) all year.
DST was not in use in 1975.
The previous DST change in Germany was on October 2, 1949.
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All of Germany uses Daylight Saving Time (DST) during part of the year. The DST period starts on the last Sunday of March and ends on the last Sunday of October, together with most other European countries.
Although a small town in Canada had experimented with seasonal clock changes as early as 1908, Germany was the first country to use nationwide DST. On April 30, 1916, at the height of World War I, the German Empire turned its clocks forward for the 1st time. Many European countries followed suit just weeks later.
After World War II, parts of Germany controlled by the Soviet Union followed doppelte Sommerzeit, double DST, advancing their clocks by 2 hours instead of 1. The rationale was to synchronize German clocks with the local time in Moscow.