The constitution of India was drafted by the constituent assembly over a period of 2 years, 11 months and 18 days. Dr. Bhimrao Ambedkar served as the chairman of the drafting committee that prepared the final draft of the constitution. The constituent assembly first met on December 9, 1946 and held its last sitting on January 24, 1950. Key events included the failure of earlier attempts like the Government of India Act 1935 to satisfy Indian aspirations, demands for a constitution drafted by Indians themselves, and the assembly passing the final version on November 26, 1949 which came into effect on January 26, 1950, commemorating the 1930 independence resolution.