The following files contain releases dates for famous game systems. These informations are extracted from Wikipedia as stated inside the files
Xbox One Release Dates in Europe
Xbox One Release Dates in the United States
Playstation 4 Release Dates in Europe
Playstation 4 Release Dates in the United States
Wii U Release Dates in Europe
Wii U Release Dates in the United States
Playstation Vita Release Dates in Europe
Playstation Vita Release Dates in the United States