February is the second
month of the
year in the
Julian and
Gregorian calendars. It is the shortest month and the only month with fewer than 30 days. The month has 29 days in
leap years, when the year number is divisible by four (except for years that are divisible by 100 and not by 400 in the Gregorian calendar). In common years the month has 28 days. Leap year birthdays are usually celebrated on the 28th in a non-leap year. Some believe that February originally had 29 days (30 in a leap year), but that idea was invented by
Sacrobosco during the
Middle Ages. See Month lengths.
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