When did my hero academia season 2 end?
The season originally ran from April 1 to September 30, 2017 on ytv in Japan, and Toho released the season on DVD and Blu-Ray in eight compilations, each containing two to four episodes, between July 19, 2017, and February 14, 2018. Funimation licensed the season for an English-language release in North America and released it in two compilations on April 3 and June 5, 2018. Funimation's adaptation ran from August 11, 2018 to February 24, 2019 on Adult Swim's Toonami block. 
When did my hero academia season 2 end in Japan?
September 30, 2017
My Hero Academia (season 2)
No context provided
When did my hero academia season 2 end in English?
February 24, 2019
My Hero Academia (season 2)
https://en.wikipedia.org/wiki/My%20Hero%20Academia%20%28season%202%29
My Hero Academia season 2 ended in Japan on September 30, 2017, and in English on February 24, 2019.