Revised Invoice

Amit Jain (Proprietor ) (533 Points)

07 August 2019  
XYZ is liable to get register under GST Act on 20th July, 2019 but he applies for GST registration on 3rd August and got registered on 6th August. Effective date of liability in GST Registration Certificate is from 20th July, 2019.
Now my question is that from 20th July to 6th August XYZ has sold goods to registered party for which he has to issue revised invoice to such party. What will be the date of that revised invoice.