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.)
- 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 will begin on a Wednesday.
- 2015 will begin 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.
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