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 BC) and in the Julian calendar that succeeded it. Other calendars have been used historically in different parts of the world; some calendars count years numerically, while others do not.