Pope Francis announced the date Monday during a meeting with cardinals inside the Apostolic Palace.
Francis had announced in July he would canonize two of the 20th century's most influential popes together, approving a miracle attributed to John Paul's intercession and bending Vatican rules by deciding that John XXIII didn't need one.
Analysts have said the decision to canonize them together was aimed at unifying the church, since each pope has his admirers and critics. Francis is clearly a fan of both: On the anniversary of John Paul's death this year, Francis prayed at the tombs of both men - an indication that he sees a great personal and spiritual continuity in them.
Both popes are also closely identified with the Second Vatican Council, the 1962-65 meetings that brought the Catholic Church into modern times, an indication that Francis clearly wants to make a statement about the council's role in shaping the church today.
A spokesman for Poland's bishops' conference, the Rev. Jozef Kloch, said the dual canonizations would stress the fact that John Paul II continued the ideas introduced by John XXIII, who called Vatican II.
Originally, the canonization was expected to have taken place Dec. 8. But Polish bishops complained that a December date would make it difficult for Polish pilgrims to come to the Vatican by bus along snowy, icy roads. As a result, the first Sunday after Easter was chosen instead - a feast day established by John Paul himself.
It was on that same feast day - Divine Mercy Sunday - that John Paul was beatified in 2011, drawing 1.5 million pilgrims to Rome.
John Paul made Jorge Mario Bergoglio - the current Pope Francis - a cardinal. Francis' immense popular appeal has also been likened to that of John XXIII, dubbed the "good pope."
Monika Scislowska contributed from Warsaw.