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New Year's Eve, also known as Old Year's Day or New Year's Eve, is a holiday that is celebrated on the last day of the year, which is December 31st in the Gregorian calendar. It is a time for people to reflect on the past year and to celebrate the start of a new year. In many countries, New Year's Eve is marked by traditions such as making resolutions, watching fireworks, and attending parties. In some cultures, it is also a time to honor ancestors and deities. The exact traditions and celebrations associated with New Year's Eve vary around the world and can be influenced by cultural, religious, and regional factors.