New Year is definitely the oldest celebrated holiday, though it wasn’t always beginning on the 1st of January. The celebration of the New Year began with people from Babylon, 4000 years ago! They celebrated it during the New Moon. However, with most countries now 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.