Cooperation Day is observed in Iran every year on September 4, corresponding to the 13th day of the month of Shahrivar in the Iranian calendar. This holiday commemorates the adoption of the Act on the Cooperative Sector of the Islamic Republic of Iran by the Islamic Consultative Assembly in 1991. The act established the Ministry of Cooperatives, which oversees cooperative businesses and social security, and emphasizes the role of cooperatives in the economy. On this day, the significance of the cooperative sector is highlighted, which includes various industries such as agriculture, real estate, carpet weaving, lending, transport, and services. The celebration aims to underline the importance of cooperatives in meeting the economic, social, and cultural needs of the community.