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Maundy Thursday, also known as Holy Thursday, Covenant Thursday, Great & Holy Thursday, and Thursday of Mysteries, is the Christian feast or holy day falling on the Thursday before Easter that commemorates the Last Supper of Jesus Christ with the Apostles as described in the Canonical gospels. It is the fifth day of Holy Week, and is preceded by Holy Wednesday and followed by Good Friday.
The date is always between 19 March and 22 April inclusive, but these dates fall on different days depending on whether the Gregorian or Julian calendar is used liturgically. Eastern churches generally use the Julian calendar, and so celebrate this feast throughout the 21st century between 1 April and 5 May in the more commonly used Gregorian calendar. The Mass of the Lord's Supper initiates the Easter Triduum, the three days of Good Friday, Holy Saturday and Easter Sunday that commemorate the Passion, Death and Resurrection of Jesus. It is normally celebrated in the evening, when Friday begins according to Jewish tradition.