The Islamic calendar 2012 is purely a lunar calendar year of about 354 days. The Islamic year begins on the first day of Muharram, and is counted from the year of the Hegira (anno Hegirae)—the year in which Muhammad emigrated from Mecca to Medina (A.D. 622). The Islamic Calendar 2012 translates to 1433–1434.
The Islamic calendar 2012 is the official calendar in the Middle-East & Gulf, especially Saudi Arabia. But other Muslim countries use the Islamic calendar for only religious occations.