The French Revolutionary calendar was a calendar system introduced during the French Revolution in 1793. It aimed to replace the traditional Gregorian calendar and reflect the revolutionary ideals of the time. The year was divided into 12 months of 30 days each, with an additional 5 or 6 days at the end of the year for festivals. Each month was named after seasonal or agricultural themes. The calendar began its year on September 22, 1792, marking the establishment of the French Republic. Days were also renamed, using terms like "day of the sun" instead of Sunday. The system was officially abandoned in 1806, but it remains a historical symbol of the revolutionary period.