The Gregorian calendar has 4 months that are 30 days long and 7 months that are 31 days long. February is the only month that is 28 days long in common years and 29 days long in leap years. From 10 to 12 Months. Our current Gregorian calendar and its predecessor, the Julian calendar, both have 12 months.

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In the old Roman calendar, October was called mensis october, the eighth month, because the Roman calendar started in March. October started out with 31 days; unlike many other months, this was never changed. In 154 BCE, a rebellion forced the Roman senate to change the beginning of the civil year from March to January 1st.