German Reunification Day , German Reunification Day 2017 Google Doodle.

CelebrationDoodle. The Day of German Unity on 3 October has been the German national holiday since 1990, when the reunification was formally completed.
An alternative choice to commemorate the reunification could have been the day the Berlin Wall came down: 9 November 1989, which coincided with the anniversary of the proclamation of the German Republic in 1918, and the defeat of Hitler's first coup in 1923. However, 9 November was also the anniversary of the first large-scale Nazi-led pogroms against Jews in 1938 (Kristallnacht), so the day was considered inappropriate as a national holiday.en.wikipedia.org/wiki/German_Unity_Day (See November 9 in German history.) Therefore, 3 October 1990, the day of the formal reunification, was chosen instead and replaced the "Day of German Unity" on 17 June, the national holiday of the Federal Republic of Germany from 1954.