What is the oldest holiday?

The oldest holiday is believed to be New Year's Day, which has been celebrated for thousands of years by various civilizations. The concept of celebrating the start of a new year can be traced back to ancient Mesopotamia around 2000 BCE, where the new year was marked with a religious festival.

Other ancient cultures such as the ancient Egyptians, Greeks, and Romans also celebrated the new year with festivals and ceremonies. In ancient Rome, New Year's Day was celebrated on March 1st according to the Roman calendar.

Over time, the date of New Year's Day has changed depending on the calendar system being used. In modern times, most cultures celebrate the new year on January 1st according to the Gregorian calendar.

New Year's Day is often celebrated with parties, fireworks, and other festivities to mark the beginning of a new year and to bring good luck and prosperity for the year ahead. It is a holiday that is celebrated by people around the world, making it one of the oldest and most universally recognized holidays.