Norway observed Central European Time (CET) all year.
DST was not in use in 1913.
The DST period starts on the last Sunday of March and ends on the last Sunday of October, together with most other European countries.
Both continental Norway, which includes the capital Oslo, and Svalbard, a Norwegian archipelago in the Arctic Ocean, use Central European Time (CET) as standard time. When Daylight Saving Time (DST) is in force, Central European Summer Time (CEST) is observed.
Daylight Saving Time has been introduced, discontinued, and re-introduced quite a few times during the 20th century. When the measure was reinstated in 1959, controversy erupted, so in 1965, DST was again abolished. However, it was re-introduced in 1980. Today, Norway follows the EU’s daylight saving schedule.