Retrospective commencement of GST amendment enacted, activating Ordinance clause to give effect to the amended State GST provision. Retrospective commencement of a Finance Act amendment to the Tripura State Goods and Services Tax provision is effected; the State Government, under powers conferred by a Tripura Ordinance, issues a notification appointing a specified earlier date as the day on which the ordinance clause altering the State GST provision comes into force.