Common year

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For the fictional reckoning of the World of Greyhawk, see Common Year (Greyhawk).

A common year is a common type of calendar year. In the Gregorian calendar, a common year has exactly 365 days and so is not a leap year. More generally, it is a calendar year without intercalation.

A common year of 365 days has exactly 52 weeks and one day, so consequently the next new year is one day of the week later. Stated differently, a common year always begins and ends on the same day of the week. (For example, in 2010, both January 1 and December 31 fell on a Friday.)

In a common year, February has exactly 4 weeks, so February and March always consecutively start on the same day of the week.

  • 2001 began on a Monday.
  • 2002 began on a Tuesday.
  • 2003 began on a Wednesday.
  • 2005 began on a Saturday.
  • 2006 began on a Sunday.
  • 2007 began on a Monday.
  • 2009 began on a Thursday.
  • 2010 began on a Friday.
  • 2011 began on a Saturday.
  • 2013 began on a Tuesday.
  • 2014 began on a Wednesday.
  • 2015 began on a Thursday.
  • 2017 will begin on a Sunday.
  • 2018 will begin on a Monday.
  • 2019 will begin on a Tuesday.
  • 2021 will begin on a Friday.
  • 2022 will begin on a Saturday
  • 2023 will begin on a Sunday.

In the Gregorian calendar, 303 of every 400 years are common years. By comparison, in the Julian calendar, 300 out of every 400 years were common years.

In the Lunisolar calendar and the Lunar calendar, a common year has 354 days.

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