Europe is marking one of its most joyous days in history. The 80th anniversary of the end of World War II on the continent was on Thursday.

WASHINGTON (TNND) — President Donald Trump proclaimed Wednesday that May 8 will be celebrated as Victory Day for World War II. He issued the proclamation a day before Victory in Europe Day, which marks the Allies’ defeat of the Axis powers in Europe during the war.

Countries across the world will be celebrating the 80th anniversary of Nazi Germany’s unconditional surrender in World War II. But this year’s events may be more bittersweet than in the past.