Sweden observed Central European Time (CET) all year.
DST was not in use in 1979.
The previous DST change in Sweden was on October 1, 1916.
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The DST period starts on the last Sunday of March and ends on the last Sunday of October, together with most other European countries.
However, like many other European countries, Sweden first changed its clocks during World War I. The country's initial DST switch was in 1916, just days after Germany had become the world's first country to introduce the measure.
However, DST was abolished again in the year after, and it was not used until 1980, when it was reinstated as a reaction to the oil crisis of 1973.