When did Imam Khomeini complete writing his famous work “Forty Hadith”?

Another famous book, Forty Hadith by Imam Khomeini, the original work in Persian, published several times under the title “Arba’in, ya chihil hadith” was written by Imam al-Khomeini nearly five decades ago and was completed in the month of Muharram 1358 (April-May, 1939).