Conversation so far:
In Vienna where did Kurt Gödel study?
At the age of 18, Kurt Gödel joined his brother in Vienna and entered the University of Vienna.
What year did Kurt Gödel start studying?
In 1924, Kurt Gödel aged 18 entered the University of Vienna.
What was Kurt Gödel's major, or field of study?
Kurt Gödel initially intended to study theoretical physics.
Did Kurt Gödel change to another field of study?
Kurt Gödel attended courses on mathematics and philosophy.

Question: When did he graduate?
Self-contained rewrite: When did Kurt Gödel graduate from the University of Vienna?