Tamil Nadu Day is celebrated to commemorate the formation of the state.
Tamil Nadu was created on 1 November 1956 with the name Madras State.
A resolution was passed unanimously in the Madras State Legislative Assembly by the Annadurai government seeking to rename the state as Tamil Nadu.
On 18 July 1967, Madras State was officially renamed to Tamil Nadu.
In 2019, the Government of Tamil Nadu announced that 1st November of every year will be celebrated as Tamil Nadu Day to mark the formation of the state.
In July 2022, Government of Tamil Nadu announced that 18 July of every year will be celebrated as Tamil Nadu Day.