Notification amendment: substitution of effective date under Assam GST notification changing the operative compliance date. The Commissioner of State Tax, Assam, exercising powers under sub section (6) of section 39 of the Assam Goods and Services Tax Act, 2017, amends Notification No. 12/2017 GST by substituting the previously stated effective date with a new date, effecting a change solely to the operative date specified in that notification.