The Jallianwala Bagh massacre at Amritsar, ordered by General Dyer, took place in which year?

The massacre occurred on 13 April 1919, the day of Baisakhi, when troops fired on a peaceful gathering protesting the Rowlatt Act and the arrest of local leaders. It preceded the Non-Cooperation Movement of 1920 and the Chauri Chaura incident of 1922, so those years are later events and are not correct.