According to the Gregorian calendar, the calendar year begins on January 1 and ends on December 31. Other alignments of the 12-month period can be used for purposes of accounting (see fiscal year).

Generally speaking, a calendar year begins on the New Year's day of the given calendar system and ends on the day before the following New Year's day.

See also

• Calendar
• Year
• Seasonal year
• Fiscal year
• ISO year

Units of time

Any civil | Kalendriaasta | Kalenterivuosi | Kalenderår | ปีปฏิทิน