Explanation:

- The National Flag of India was adopted by the Constituent Assembly on 22 July, 1947. This was before India gained independence, as the flag needed to be ready when India became a sovereign nation on August 15, 1947.

- 22 January, 1950: This date is very close to when India became a republic on January 26, 1950, but not associated with the adoption of the National Flag.

- 24 January, 1950: On this day, the Constituent Assembly adopted the Indian Constitution's final version, not the National Flag.

- 22 July, 1948: This date is a year after the flag's official adoption and does not relate to the flag's adoption.