Appointed day under Section 18A designated, fixing the effective start date for Central Sales Tax provision application. The Central Government, invoking the Explanation to sub section (2) of Section 18A of the Central Sales Tax Act, 1956, appoints a specific calendar date as the appointed day for the purposes of sub section (2) of Section 18 of the Act, thereby fixing the effective date for application of that sub section by way of ministerial notification.