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Iran is a constitutional Islamic republic with a theocratic system of government where ultimate political authority is vested in a religious scholar, the Supreme Leader. Shia Islam is the official religion of Iran, and Islamic law is the basis of the authority of the state. The Iranian Constitution guarantees freedom of worship to Jews, Christians and Zoroastrians, though they are sometimes the subject of discrimination and repression. The workweek in Iran is Saturday through Thursday; however, many government offices and private companies are closed on Thursdays. Friday is the day of rest when all establishments are closed. Offices in Iran are generally open to the public during the morning hours only. Read the Department of State Background Notes on Iran for additional information.