The Constituent Assembly, which first met on December 9, 1946, took precisely 2 years, 11 months and 18 days to come up with the final draft which was ratified on November 26, 1949. During this period, it held eleven sessions covering a total of 165 days. Of these, 114 days were spent on the consideration of the Draft Constitution.The Assembly met once again on 24 January, 1950, when the members appended their signatures to the Constitution of India. Out of the 299 members of the Constituent Assembly, only 284 were present on that day and signed the Constitution. This is also the date mentioned in the Preamble on which the people of India adopted, enacted and gave to themselves this Constitution.Some provisions of Constitution came into force on November 26, 1949 and the major part came into force on January 26, 1950.Source : Some Facts of Constituent Assembly