The Feast of Divine Mercy, also known as Divine Mercy Sunday, is the Second Sunday of Easter. Jesus promised to give great graces on Divine Mercy Sunday. Specifically, He told St. Faustina:
“On that day, the very depths of My tender mercy are opened. I pour out a whole ocean of graces upon those souls who approach the fount of My mercy. … On that day, all divine floodgates through which graces flow are opened. The soul that will go to Confession and receive Holy Communion shall obtain complete forgiveness of sins and punishment”
(Diary, 699).