"Iran is a constitutional Islamic republic, governed by executive and legislative branches that derive national leadership primarily through the Muslim clergy. Shia Islam is the official religion of Iran, and Islamic law is the basis of the authority of the state. Shia Islamic ideals and beliefs provide the conservative foundation of the country's customs, laws and practices. Iran is a developing country. The workweek in Iran is Sunday through Thursday; however, many government offices and private companies are closed on Thursdays. Friday is a public holiday for all establishments. Offices in Iran are generally open to the public during the morning hours only."