Holy Week violet covers during Passiontide, but the crucifix covers can be white instead of violet on Maundy Thursday). Some Protestant churches practice the foot washing (Maundy) ceremony on Maundy Thursday. For others, it may be the only time in the year when Holy Communion is celebrated. Good Friday commemorates the crucifixion of Jesus and his subsequent death. Commemorations of often solemn and mournful, many denominations use Good Friday to perform the Stations of the Cross, or other commemorations of the Passion, either as a self-guided time of reflection and veneration or as a procession of statues or images of the stations.
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