General Clauses Act, 1897
5. Coming into operation of enactment
15[(1) Where any Central Act is not expressed to come into
operation on particular day, then it shall come into operation on the day on
which it receives the assent-
(a) in the case of a Central Act made before
the commencement of the Constitution, of the Governor-General, and
(b) in the case of an Act of Parliament, of
the President].
16[* * * ]
(3) Unless the contrary is expressed, a 13[Central Act] or
Regulation shall be construed as coming into operation immediately on the
expiration of the day preceding its commencement.