Why is February the shortest month?
How Roman calendar history shaped February's unusual length.
Roman origins
Modern month lengths developed through Roman calendar reforms. February occupied a special position in early Roman systems and retained a shorter length as the calendar evolved.
Leap-day placement
The extra Gregorian leap day is assigned to February, giving it 29 days in leap years. The popular story that Augustus stole a day for August is not a reliable explanation.
The modern rule
For present-day calculations, the Gregorian divisibility rule determines February's length. Historical dates require attention to the calendar then in use.
Related month guides
- How many days are in each month? — A complete guide to 28-, 29-, 30- and 31-day months.
- February 29 and leap day — When leap day occurs and how it affects dates and anniversaries.
- Where the month names come from — The Roman roots behind the twelve English month names.