Article: His next relationship was with Herta Haas, whom he married in 1940. Broz left for Belgrade after the April War, leaving Haas pregnant. In May 1941, she gave birth to their son, Aleksandar "Mišo" Broz. All throughout his relationship with Haas, Tito had maintained a promiscuous life and had a parallel relationship with Davorjanka Paunović, who, under the codename "Zdenka", served as a courier in the resistance and subsequently became his personal secretary. Haas and Tito suddenly parted company in 1943 in Jajce during the second meeting of AVNOJ after she reportedly walked in on him and Davorjanka. The last time Haas saw Broz was in 1946. Davorjanka died of tuberculosis in 1946 and Tito insisted that she be buried in the backyard of the Beli Dvor, his Belgrade residence.

Question: When did Haas give birth to Tito's son?
1941