In the Gregorian calendar, New Year's Eve, also known as Old Year's Day, is the evening or the entire day of the last day of the year, 31 December. In many countries, New Year's Eve is celebrated with dancing, eating, drinking, and watching or lighting fireworks. Some Christians attend a watchnight service. The celebrations generally go on past midnight into New Year's Day, 1 January.

Pope Sylvester I was the bishop of Rome from 31 January 314 until his death on 31 December 335. He filled the See of Rome at an important era in the history of the Western Church, though very little is known of his life.