revise return

If you are asking for F/Y 2016-17

As per section 139(5), if any person, having furnished a return under sub-section (1) or sub-section (4) , discovers any omission or any wrong statement therein, he may furnish a revised return at any time before the expiry of one year from the end of the relevant assessment year or before the completion of the assessment, whichever is earlier.

In simple words, assessee can revise its return even filed after due date mentioned above within 2 years from the end of the relevant financial year.

For Example:

Mr. A can revise its return upto 31st March, 2019 for the financial year 2016-17 even return was filed after due date or before due date.

Even If return was filed after 30th July, 2017 then assessee can revise its return 

So, You can Revise ITR FOR A/Y 2017-18 filed befor 31st March 2018.