New Year's Day is a globally celebrated holiday that marks the beginning of the new year on the Gregorian calendar. The transition to the new year is often accompanied by various customs, traditions, and celebrations.

Berchtold's Day is a regional holiday in Switzerland and Liechtenstein, especially in German-speaking cantons. Its exact origins are uncertain, and over the centuries, the holiday has blended pagan, medieval, and social traditions into a post–New Year celebration.