Due date under Section 139(1) to file 10-1C

Dear Experts,
Good Morning!
Kindly let us know the due date (whether it is original due date as per Finance Act-2021 i.e. 31-10-2021 or extended due date 15-02-2022 as per Notification or Circulars issued by CBDT) for filing ITR-6 and 10-IC to claim concessional income tax rate of 22% under section 115BAA, for the Assessment Year 2021-22.