HEY! I wrote a whole big description about this but it got deleted. So here's Wikipedia's intro page on "new year" for your reading joy:
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
Many cultures celebrate the event in some manner[1] and the 1st day of January is often marked as a national holiday.
In the Gregorian calendar, the most widely used calendar system today, New Year occurs on January 1 (New Year's Day). This was also the case both in the Roman calendar (at least after about 713 BCE) and in the Julian calendar that succeeded it.
