Commencement of GST Amendment provisions: sections 2, 3 and 7-15 commence on the appointed date. A state notification, invoking sub section (2) of Section 1 of the Amendment Act, appoints a specific commencement date to bring specified provisions of the Himachal Pradesh Goods and Services Tax (Amendment) Act, 2021 into force, thereby making those amendment provisions effective without changing their substantive terms.