‘New Year's Eve’, also known as ‘Old Year's Day’ or ‘Saint Sylvester's Day’ is the entire day and evening of the last day of the year on December 31:
“…the last day of the year is commonly referred to as ‘New Year’s Eve’.
“In many countries, New Year's Eve is celebrated with dancing, eating, drinking and watching, lighting fireworks. Some people attend a watchnight service.
“The celebrations generally go on past midnight into New Year's Day, January 1.”
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