Common year

A common year is a calendar year with 365 days. It is a year that is not a leap year. This means a common year has 52 weeks and one day. So if a certain year started on a Monday, the following year will start on a Tuesday. Stated differently, a common year always begins and ends on the same day of the week (for example, in 2023, January 1 and December 31 fell on a Sunday). In common years, February has exactly four weeks, so March begins on the same day of the week. November also begins on this day. For example, if February 2023 began on a Wednesday, then March would begin on a Wednesday as well. November follows the same characteristic.

In the Gregorian calendar, 303 out of every 400 years are common years. In the Julian calendar, 300 out of every 400 years were common years. All the other years are special and known as leap years.