Question: When did was the cease fire of the event that started when the Kwantung Army of the Empire of Japan invaded Manchuria?
Sentence (from "Tanggu Truce"): The Tanggu Truce, sometimes called the Tangku Truce (Japanese: 塘沽協定 , Hepburn: Tōko kyōtei ) , was a cease-fire signed between Republic of China and Empire of Japan in Tanggu District, Tianjin on May 31, 1933, formally ending the Japanese invasion of Manchuria which had begun two years earlier.
Relevant evidence: Yes