Iranian Islamic Republic Day
Iranian Islamic Republic Day is held on April 1. 1979. This event in the first decade of the month April is annual. 
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Iranian Islamic Republic Day is Farvardin 12, known as Ruz e Jomhuri ye Eslāmi. The day is a national and a public holiday in Iran. It marks the day that the results of the March 1979 Iranian Islamic Republic referendum were announced. The results announced were a 98.2% vote for the establishment of an Islamic republic in the state.
The day usually falls on 1 April, however, as it is determined by the vernal equinox, the date can change if the equinox does not fall on 21 March.
Similar holidays and events, festivals and interesting facts
Iranian New Year on March 21
Sizdah Be-dar in Iran on April 2 (celebrated on the 13th day after vernal equinox);
Army Day in Iran on April 18
National Persian Gulf Day in Iran on April 30
Teachers' Day in Iran on May 2
National Day for Physicians in Iran on August 23
National Cheetah Day in Iran on August 30