On July 9th, 1789. Right after the Tennis court oath.
Source:
http://bastille-day.com/history/Estates-General-1789
The National Assembly was formed by the representatives of the Third Estate of the Estates General. After the French Revolution the National Assembly became known as the National Constituent Assembly.
National Assembly of Bulgaria was created in 1886.
National Assembly of Women was created in 1952.
National Assembly of Soviets was created in 1919.
National Assembly of Soviets ended in 1919.
National Assembly of Cambodia was created in 1993.
National Assembly of Armenia was created in 1938.
National State Assembly was created in 1972.
National Assembly of Thailand was created in 1932.
National Assembly of Eritrea was created in 1992.
National Assembly of Azerbaijan was created in 1918.
Weimar National Assembly ended in 1920.