28 March 2017
For Financial Year ending 31/03/2016 last date of filing ITR is 31/03/2018
Amendments in section 139(4) (i.e before end of relevant assessment year) are applicable from AY 2017-18, So for AY 2016-17 (i.e. FY 2015-16) Return can be filed till 31/03/2018