Section 13(2)(a) in The U.P. 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 Uttar Pradesh Act No. 45 of 2018, dated 24.12.2018.] section 31 or the date of receipt of payment, whichever is earlier; or