FY 20-21 reconciliation due date under GST

V Vinodkumar (Proprietor) (230 Points)

11 September 2021  
For the F.Y.2020-21 last date for reconciliation is 30/09/21. weather we have to reconcile the same and have to pass the entry with the August 21 returns and have to file before 30/09/21 or as on 30/09/21, with the return of September 21 gstr1 and 3B we have to file the return before due date that is 11th and 20th of October 21 respectively. please reply me.
And my humble request is few members give their opinion, please don't do it. I want reply from specialised persons.
Thank you