"Victory Day[a 1] is a holiday that commemorates the Soviet victory over Nazi Germany in 1945. It was first inaugurated in the 15 republics of the ...
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Soviet Union following the signing of the German Instrument of Surrender late in the evening on 8 May 1945 (9 May Moscow Time).[a] The Soviet government announced the victory early on 9 May after the signing ceremony in Berlin. Although the official inauguration occurred in 1945, the holiday became a non-labor day only in 1965, and only in certain Soviet republics.
In East Germany, 8 May was observed as Liberation Day from 1950 to 1966, and was celebrated again on the 40th anniversary in 1985. In 1967, a Soviet-style "Victory Day" was celebrated on 8 May. Since 2002, the German state of Mecklenburg-Vorpommern has observed a commemoration day known as the Day of Liberation from National Socialism, and the End of the Second World War." - (en.wikipedia.org 10.12.2023)