New Year's Day is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar used in ancient Rome. With most countries using the Gregorian calendar as their main calendar, New Year's Day is the closest thing to being the world's only truly global public holiday, often celebrated with fireworks at the stroke of midnight as the new year starts. January 1 on the Julian calendar currently corresponds to January 14 on the Gregorian calendar, and it is on that date that followers of some of the Eastern Orthodox churches celebrate the New Year. New Year's Day is a postal holiday in the United States.

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元旦是1月1日，是现代公历的第一天，也是古代罗马使用的朱利安历法。大多数国家把公历作为他们的主要日历，元旦是世界上唯一一个真正意义上的全球公共假日，新年钟声在午夜钟声开始时庆祝。朱利安日历上的1月1日与公历1月14日相吻合，东正教东正教信徒在这一天庆祝新年。元旦也是美国的邮政假日。