26th January, 1930
on this day purna swaraj or attainment of complete independance from the british was declared as the main motive of the congress
the constitution of india was signed and adopted in part on 26th nov 1949 which is celebrated as law day... but all its provisions were adopted on 26th january 1950 in order to honour the pledge of poorna swaraj taken at the lahore congress on 26th jan 1930...this day 26th jan is celebrated as republic day in india...hope i helped :-)
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