Where it is not possible to determine the time of supply in terms of sub-section 2, 3, 4of Section 12 or that of Section 13 of CGST/SGST Act, how will time of supply be determined?

There is a residual entry in Section 12(5) as well as 13 (5) which says that if periodical return has to be filed, then the due date of filing of such periodical return shall be the time of supply. In other cases, it will be the date on which the CGST/SGST/IGST is actually paid.