Extension of Due Date of IT filing

ANKUR TAH (Teacher Consultant and CA finalist.)   (543 Points)

02 September 2018  
As on 26th of July, 2018 Notification came for extension the due date from 31st july, 18 to 31st Aug, 2018.

But unfortunately filing had been done Under sec 139(4) belated return as on 20th Aug 2018.

So please guide me whether those return is correct in the eyes of law?

If not, any precautions can possible?