Here The Details,
Release Date by Country Galaxy S8 and Galaxy S8 Edge Release Date
Australia 3rd Week April 2017
Austria 3rd Week April 2017
Brazil 3rd Week April 2017
Canada 2nd Week April 2017
China 1st Week April 2017
Denmark 3rd Week April 2017
England 2nd Week April 2017
Finland 4th Week April 2017
France 3rd Week April 2017
Germany 3rd Week April 2017
Greece 3rd Week April 2017
Hong Kong 1st Week April 2017
Hungary 4th Week April 2017
India 2nd Week April 2017
Indonesia 3rd Week April 2017
Italy 3rd Week April 2017
Japan 1st Week April 2017
Nigeria 4th Week April 2017
Philippines 2nd Week April 2017
Poland 3rd Week April 2017
Russia 3rd Week April 2017
Singapore 3rd Week April 2017
South Africa 3rd Week April 2017
South Korea 1st Week April 2017
Spain 3rd Week April 2017
Sweden 3rd Week April 2017
Switzerland 3rd Week April 2017
Taiwan 1st Week April 2017
The Netherlands 4th Week April 2017
United States 2nd Week April 2017