Other Changes
By a separate decree of the same year 1955, Pope Pius XII instituted the feast of "Saint Joseph the Worker" on May 1 (moving the feast of "Saints Philip and James Apostles" from May 1, where it had been since the sixth century, to May 11, and suppressing the "Solemnity of Saint Joseph, Spouse of the Blessed Virgin Mary" that, since Pope Pius IX's decree of September 10, 1847, had been celebrated on the second Wednesday after the Octave of Easter).
He also instituted the feast of the Blessed Virgin Mary, Queen on May 31; to make room for it, he moved the feast of Saint Angela Merici to June 1.
Read more about this topic: General Roman Calendar Of Pope Pius XII