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
Maundy Thursday kept at the cathedral as a reserve if a parish runs out. The service is a 1967 restoration of the rite recorded in the early 200s by the historian Hippolytus who writes of a ceremony taking place during the Easter Vigil at which two holy oils were blessed and one was consecrated. In the fifth century, the ceremony of the oils was transferred from the Holy Saturday Vigil to Holy Thursday during a special Mass for that purpose, distinct from the Mass of the Lord's Supper. The change took place partly because of the large crowds that assembled for the