The main Church of Serbia and Montenegro is the Orthodox Church. Like Russia, the tradition is to use the Julian calendar as opposed to the modern Gregorian calendar - at least when it comes to holidays and traditions. Day to day life is ruled by the Gregorian calendar.
The territorial organization of Serbia is regulated by the Law on Territorial Organization, adopted by the National Assembly of Serbia on 29 December 2007. Under the Law, the units of the territorial organization are: municipalities, cities and autonomous provinces.
The ethnic population of the Republic of Serbia is heterogeneous, which resulted from the country's turbulent past. The majority of the population of Serbia are Serbs, but another 37 nationalities also live on its territory. All citizens have equal rights and responsibilities and enjoy full ethnic equality.