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 the liturgical day starts from the evening before a calendar day, the prayers of Palm Sunday begin on the evening of Lazarus' Saturday. Throughout Holy Week, a paschal service is conducted each evening, starting on Sunday night (the eve of Monday), and every morning, up until Easter. These paschal services take place in the middle of the church, not on the altar, because Jesus suffered and was crucified on Golgotha, outside of Jerusalem. The altar is bared of all its coverings and relics. Each day service is divided into 5 "hours"; The First Hour, The Third Hour, The Sixth Hour,