In 1793, during the French Revolution, an entirely new calendar was established by the National Convention. The calendar was designed to help rid French society of its Christian influences. Within this new calendar there were 12 months, each consisting of three decades. Each decade was composed of 10 days. Five days (six during leap year) were added at the end of the year to add up to 365 (or 366) days. Napoleon reinstated the Gregorian calendar in 1806.