Due to the time differences; Russia, Serbia and Belarus celebrate and recognise Victory Day as the 9th May. See the follow paragraph from Wikipedia: "The instrument of surrender signed 7 May 1945 stipulated all hostilities had to stop at 23:01 (CET), 8 May 1945, just an hour before midnight. Since that time would be already 9 May in the USSR, most post-Soviet states, including Russia celebrated Victory Day on 9 May. Since the end of Communism the former Soviet bloc in Europe except Russia, Belarus, Ukraine, and Serbia have shifted to celebrate, where the date is celebrated such as on major anniversaries, 8 May as the end of World War II, in line with the 7 May 1945 unconditional surrender document that Soviet and Russian leaders refused to recognise. "