Which calendar holiday is celebrated on January 1 in the Gregorian calendar?

New Year's Day is the calendar holiday celebrated on January 1 in the Gregorian calendar.

It follows New Year's Eve, which is the final evening of the preceding year. January 1 is the first day of the civil year in the Gregorian calendar, the international civil calendar used by most countries. Public celebrations commonly include countdowns, fireworks, parades, religious observances, family gatherings, and resolutions.

The date has a long history but was not universal across earlier calendars. In the Roman world, January 1 became an important year-opening date when consuls began their terms on that day in 153 BCE. The Gregorian calendar was introduced by Pope Gregory XIII in 1582 as a reform of the Julian calendar, chiefly to correct the calendar's drift relative to the seasonal year. Different religious and cultural calendars can mark New Year on other dates.