Though chronologically three days, they are liturgically one day unfolding for us the unity of Christ's Paschal Mystery. The liturgical services that take place during the Triduum are: 

HOLY THURSDAY - April 13, 2017 / 7:00pm THE EVENING MASS OF THE LORD'S SUPPER

GOOD FRIDAY - April 14, 2017  / 3:00pm CELEBRATION OF THE LORD'S PASSION

HOLY SATURDAY - April 15, 2017 / 8:30pm VIGIL OF THE LORD'S RESURRECTION

EASTER SUNDAY - April 16, 2017 / 8:00am and 10:30am MASS OF THE LORD'S RESURRECTION