Dear B. Saikumar, the said amendment was approved by the union government on 30th August 2007. Regarding notification, it was left for the concerned state governments to notify such amendments accordingly as labor laws come under the concurrent list of the Indian Constitution, and both Parliament and State Legislatures have the right to make laws.
http://pib.nic.in/newsite/erelease.aspx?relid=30701
We should also note that:
1. The Andhra Pradesh High Court, in its judgment, has struck down Section 66 (1) (b) of the Factories Act 1948 as unconstitutional.
2. The Madras High Court ruled that Section 66(1) (b) of the Factories Act 1948 was a violation of the constitutionally guaranteed fundamental right to equality enjoyed by women and was discriminatory to women on the sole ground of sex.
3. The Mumbai High Court, in its judgment on 10th June 1999, passed an interim order allowing the deployment of women in Santa Cruz Electronic Export Processing Zones (SEEPZ) during the night shift.
The measures outlined by the Madras High Court state that before the Central and State Governments introduce rules, several provisions for the safety and security of women and preservation of their dignity and honor (as suggested by the high court) should be adopted by every employer who intends to employ women in their factories during night shifts.
Regards, Kamal