Islamic Republic Day in Iran is annually celebrated on the 12th of Farvardin, the first month of the Solar calendar.
This date corresponds to April 1 in the Gregorian calendar.
This holiday celebrates the anniversary of the establishment of the Islamic Republic in 1979.
Ruling Qajar Dynasty was overthrown in 1921 by Reza Khan, Prime Minister of Iran.
He was forced to abdicate after Iran came under British and Russian occupation and establishment of the Persian Corridor, that lasted till 1946.
Protests led to the Islamic Revolution, that began in January 1978.
A new government was formed and the Islamic Republic was proclaimed on April 1.
