A common year is a common type of calendar year. It 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.

• 2005 began on a Saturday.
• 2006 began on a Sunday.
• 2007 began on a Monday.
• 2008, a leap year, began on a Tuesday.
• 2009 will begin on a Thursday.
• 2010 will begin on a Friday.
• 2011 will begin on a Saturday

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.

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