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. See Month lengths. February starts on the same day of the week as both March and November in common years, and August in leap years. Having only 28 days in common years, it is the only month of the calendar that once every six years and twice every 11 years, will have only four full 7-day weeks where the first day of the month starts on a Sunday and the last day ends on a Saturday. This pattern can be observed in 2009 and can be traced back 11 years to 1998, another 11 years back to 1987, and 6 years back to 1981; and so on twice 11 years consecutively and once six years either forward into the future or back into the past, unless the pattern is broken by a skipped leap year, but no leap year has been skipped since 1900 and no others will be skipped until 2100.
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