Farsi, the official language of Iran, is historically one of the most prominent languages of the Middle East and extended regions. Iranian culture is one of the oldest in the region, and it has influenced cultures like Italy, Macedonia, Greece, Russia, the Arabian Peninsula, and parts of Asia. Islam is practiced by the majority of Iranians and governs their personal, political, economic and legal lives.
The Persian calendar is a solar calendar, however, some of the official religious Islamic and Shia holidays are based on a lunar calendar. Government official working days are from Saturday to Wednesday.