He finally graduated from Kaijo Junior High School in 1914 and was accepted into Waseda University to study at the Faculty of Literature.

As a student in Rikkyo Junior High School, on May 13, 1909, an argument with delinquent youths in Akashichō, Tokyo, escalated to the point where Date pulled out his gun and shot them, killing them.

Detective Saburo Iwai's investigation of the victim's behavior helped the Date family lawyers' defence that he was acting in self-defence.

In 1916, Kawashima Naniwa and Aisin-Gioro Shanyu created the Second Manchu-Mongol Independence Movement, which Date joined.

After the movement's failure, he created the Shandong Autonomy Allied Army in 1938 under the orders of Terauchi Hisaichi.

[6] In late January 1939, he led a massacre in Ye County (today known as Laizhou), killing around 400 people.

He was sentenced to death, and Date was moved to Shanghai Prison, where he was executed by firing squad on September 9, 1948.