The Feast of Divine Mercy, celebrated on the Octave of Easter (the Sunday after Easter Sunday), is a relatively new addition to the Roman Catholic liturgical calendar. Celebrating the Divine Mercy of Jesus Christ, as revealed by Christ Himself to Saint Maria Faustina Kowalska, this feast was extended to the entire Catholic Church by Pope John Paul II on April 30, 2000, the day that he canonized Saint Faustina.
In 2013, Divine Mercy Sunday is celebrated on April 7.