The provisions relating to time of supply of goods / services are relevant in ascertaining the time to remit the taxes on a particular transaction involving supply of goods / services under the GST Law. The CGST Act, 2017 provides separate provisions for time of supply of goods and services viz., Section 12 for time of supply of goods and Section 13 for time of supply of services.
(ICAI FAQ PUBLICATION 06-09-2017 TIME OF SUPPLY OF GOODS: FAQ NO. 1)