Calendars and time
Common Year
Direct answer
Common Year: A Common Year is a calendar year without an intercalary day, containing 365 days in the Gregorian and Julian calendars.
A Common Year is a 365-day Gregorian or Julian year with no leap day.
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At a glance
- Found in
- Calendars & Timekeeping
- Related
- Calendar Year, Calendar, Julian Date, Coordinated Universal Time
A Common Year is a 365-day Gregorian or Julian year with no leap day.
A cycle or timeline schematic for comparing the named timekeeping concept.
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The story behind Common Year
The contrast between ordinary and leap years comes from calendar systems that periodically intercalate a day to track the seasonal year.
Why Common Year matters
Distinguishing common years from leap years prevents one-day errors in date intervals, weekday calculations, and annual ephemerides.
How to read Common Year
Common Year applies when a calculation depends on whether February has 28 days or an annual sequence contains 365 dates.
Common Year in practice: an example
The year 2025 is a Common Year in the Gregorian calendar, so February has 28 days.
Where readings of Common Year go wrong
A common error is to assume every culture or calendar defines a common year as exactly 365 days.
Sources and editorial method
Research references used for this entry include:
- U.S. Naval Observatory: Introduction to Calendars - Official overview of calendar systems, leap rules, eras, and historical calendar reform.
- Source
- The Great Almanac Dictionary
- Category
- Calendars & Timekeeping
- Last updated
- 2026-09-26
Check the year length
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More in Calendars & Timekeeping
- Earth Rotation Angle
- Greenwich Sidereal Time
- Julian Century
- Lunisolar Calendar
- Regnal Year
- Terrestrial Time
- Year Zero
- Before Common Era
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Common questions
What is a Common Year?
A Common Year is a calendar year without an intercalary day, containing 365 days in the Gregorian and Julian calendars.
What do people get wrong about a Common Year?
A common error is to assume every culture or calendar defines a common year as exactly 365 days.
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