Central European Midsummer Time (CEMT) is one of the names of UTC+03:00 time zone, 3 hours ahead of Coordinated Universal Time. It was used as a double summer daylight saving time in several European countries during the 1940s.
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France
Some parts of France, but not Paris, observed Central European Midsummer Time in 1941–1945.
Germany
Central European Midsummer Time was used in occupied Germany from 11 May, 03:00 CEST to 29 June 1947, 03:00 CEMT.
According to GHEP, Berlin and the Soviet Occupation Zone observed midsummer time from 24 May 1945, 02:00 CET to 24 September 1945, 03:00 CEMT. Midsummer time was equivalent to Moscow Time, which did not observe DST then.
References
Central European Midsummer Time Wikipedia(Text) CC BY-SA