New Year's Dayalso called simply New Year's or New Yearis observed on January 1the first day of the year on the modern Gregorian calendar as well as the Julian calendar. In the present daywith most countries now using the Gregorian calendar as their de facto calendarNew Year's Day is probably the most celebrated public holidayoften observed with fireworks at the stroke of midnight as the new year starts in each time zone. Other global New Years' Day traditions include making New Year's resolutions and calling one's friends and family.

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