sentences:  Among the Western Christian Churches, the feast day is held on the anniversary of Saint Sylvester's death, 31 December, a date that, since the adoption of the Gregorian calendar, has coincided with New Year's Eve.For these Christian denominations, Saint Silvester's Day liturgically marks the seventh day of Christmastide.Eastern Orthodox Churches celebrate Sylvester's feast on a different day from the Western Churches, i.e.