What is the last date of submitting rectification request?

Dear Experts,
There is a time limit to submit rectification request u/s 154(7) of the Income Tax Act, 1961. The intimation order u/s 143(1) was passed on 03.05.2018 for the ITR of AY 2017-18. What is the last date of submitting rectification request by the assessee for the said order?