Maundy Thursday April 22 inclusive, but these dates fall on different days depending on whether the Gregorian calendar or Julian calendar is used liturgically. Eastern churches generally use the Julian calendar and celebrate this feast throughout the 21st century between April 1 and May 5 in the more commonly used Gregorian calendar. The liturgy held on the evening of Maundy Thursday initiates the Easter Triduum, the period which commemorates the passion, death, and resurrection of Jesus; this period includes Good Friday and Holy Saturday, and ends on the evening of Easter. The Mass of the Lord's Supper or service of worship is
Holy Week During the Eucharist, the newly baptised receive Holy Communion for the first time. According to the rubrics of the Missal, the Eucharist should finish before dawn. Easter Sunday, which immediately follows Holy Week and begins with the Easter Vigil, is the great feast day and apogee of the Christian liturgical year: on this day the Resurrection of Jesus Christ is celebrated. It is the first day of the new season of the Great Fifty Days, or Eastertide, which runs from Easter Sunday to Pentecost Sunday. The Resurrection of Christ on Easter Sunday is the main reason why Christians keep Sunday