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 and healing. In addition, the Bishop and clergy in attendance will reaffirm their Ordination Vows. In the Eastern Orthodox Church, the liturgical colours are brighter, white being common. On this day alone during Holy Week, the fast is relaxed to permit consumption of wine and oil. The primary service of this day is Vespers combined with the Liturgy of St. Basil the Great at which is read the first Passion Gospel (), known as the "Gospel of the Testament", and many of the normal hymns of the Divine Liturgy are substituted with the following troparion: "Of Thy Mystical Supper, O