Section 13(2)(a) in The Punjab Goods and Services Tax Act, 2017
(a)the date of issue of invoice by the supplier, if the invoice is issued within the period prescribed under [***] [Omitted 'sub-section (2) of' by Punjab Act No. 1 of 2019, dated 8.1.2019.] section 31 or the date of receipt of payment, whichever is earlier; or