Commencement of Amendment Act: executive notification appoints the date on which the constitutional amendment comes into force.
The Central Government issued a legislative notification under the Amendment Act empowering provision, appointing a day in September 1987 as the date on which the Constitution (Fifty seventh Amendment) Act, 1987 shall come into force, formalised by the Ministry of Law and Justice.

Commencement date appointed for Constitution (Fifty-sixth) Amendment Act, confirming the Act comes into force on 30 May 1987.
Under the authority of section 1(2) of the Constitution (Fifty-sixth Amendment) Act, 1987, the Central Government issued notification S.O. 517(E) dated 26 May 1987 appointing 30 May 1987 as the date on which the Act shall come into force.

Commencement date appointed for the Constitution (Fifty fifth Amendment) Act to bring it into force by central government notification.
The Central Government, exercising the power conferred by sub section (2) of Section 1 of the Constitution (Fifty fifth Amendment) Act, 1986, by notification issued through the Ministry of Home Affairs appointed the date on which the Amendment Act shall come into force, thereby giving effect to the Act's commencement provision.

Commencement date: Constitution (Fifty-Third Amendment) Act, 1986 appointed to come into force on 20 February 1987.
The Central Government, invoking the power under sub section (2) of section 1 of the Constitution (Fifty-Third Amendment) Act, 1986, by notification S.O. 71(E) dated 11 2 1987, appointed 20th February 1987 as the date on which the Act shall come into force.