Maundy Thursday normally celebrated in the evening, when Friday begins according to Jewish tradition, as the Last Supper was held on the feast of Passover, according to the three Synoptic Gospels. Use of the names "Maundy Thursday", "Holy Thursday", and others is not evenly distributed. What is the generally accepted name for the day varies according to geographical area and religious affiliation. Thus, although in England "Maundy Thursday" is the normal term, the term is less commonly used in Ireland, Scotland or Canada. People may use one term in a religious context and another in the context of the civil calendar of
Adoption of the Gregorian calendar 12 days, only 11 were skipped, and the day of the week was repeated on successive days, because at the same time the International Date Line was moved, from following Alaska's eastern border with Canada to following its new western border, now with Russia. Many of the countries of eastern Europe were Eastern Orthodox or Islamic and adopted the Gregorian calendar much later than western Christian countries. Roman Catholic countries such as the Polish–Lithuanian Commonwealth adopted the "new style" (N.S.) Gregorian calendar in 1582 (switched back in 1795 after Third Partition of Poland), but the switch to the Gregorian calendar