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A common year is a
calendar year A calendar is a system of organizing days. This is done by giving names to periods of time Time is the indefinite continued sequence, progress of existence and event (philosophy), events that occur in an apparently irreversible process, ...
with 365
day A day is approximately the period during which the Earth completes one rotation around its axis, which takes around 24 hours. A solar day is the length of time which elapses between the Sun reaching its highest point in the sky two consecutive t ...

day
s, as distinguished from a
leap year A leap year (also known as an intercalary year or wikt:bissextile, bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) added to keep the calendar year synchronized with the astron ...

leap year
, which has 366. More generally, a common year is one without intercalation. The
Gregorian calendar The Gregorian calendar is the used in most of the world. It was introduced in October 1582 by as a modification of the , reducing the average year from 365.25 days to 365.2425 days, and adjusting for the drift in the that the inaccuracy ha ...
(like the earlier
Julian calendar The Julian calendar, proposed by Julius Caesar Gaius Julius Caesar (; 12 July 100 BC – 15 March 44 BC) was a Roman Roman or Romans usually refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century B ...
) employs both common years and leap years to keep the calendar aligned with the
tropical year A tropical year (also known as a solar year or tropical period) is the time Time is the continued of and that occurs in an apparently succession from the , through the , into the . It is a component quantity of various s used to event ...
, which does not contain an exact number of days. The common year of 365 days has 52
week A week is a time unit A unit of time or midst unit is any particular time interval, used as a standard way of measuring or expressing duration. The SI base unit, base unit of time in the International System of Units (SI) and by extension mo ...

week
s and one day, hence a common year always begins and ends on the same day of the week (for example, January 1 fell on a Friday and December 31 will fall on a Saturday in 2022, the current year) and the year following a common year will start on the subsequent day of the week. In common years, February has exactly four weeks, so March begins on the same day of the week. November also begins on this day. In the Gregorian calendar, 303 of every 400 years are common years. By comparison, in the
Julian calendar The Julian calendar, proposed by Julius Caesar Gaius Julius Caesar (; 12 July 100 BC – 15 March 44 BC) was a Roman Roman or Romans usually refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century B ...
, 300 out of every 400 years are common years, and in the
Revised Julian calendar The Revised Julian calendar, also known as the Milanković calendar, or less formally new calendar, is a calendar A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months a ...
(used by Greece) 682 out of every 900 years are common years.


Calendars

*
Common year starting on MondayA common year starting on Monday is any non-leap year A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar A lunisolar calendar is a calenda ...
*
Common year starting on Tuesday A common year starting on Tuesday is any non-leap year A leap year (also known as an intercalary year or wikt:bissextile, bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) added ...
*
Common year starting on Wednesday A common year starting on Wednesday is any non-leap year A leap year (also known as an intercalary year or wikt:bissextile, bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) add ...
*
Common year starting on Thursday A common year starting on Thursday is any non-leap year A leap year (also known as an intercalary year or wikt:bissextile, bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) adde ...
*
Common year starting on Friday A common year starting on Friday is any non-leap year A leap year (also known as an intercalary year or year) is a that contains an additional day (or, in the case of a , a month) added to keep the calendar year synchronized with the or . B ...
*
Common year starting on Saturday A common year starting on Saturday is any non-leap year A leap year (also known as an intercalary year or wikt:bissextile, bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) added ...
*
Common year starting on Sunday A common year starting on Sunday is any non-leap year (i.e. a year with 365 days) that begins on Sunday, January 1, 1 January, and ends on Sunday, December 31, 31 December. Its dominical letter hence is A. The most recent year of such kind was 2017 ...
Calendars Types of year Units of time {{time-stub