07 December 2015
You can revise TDS return anytime. There is no time limit. So revise your A.Y. 2014-15 Q2 return and also file new return of A.Y. 2015-16 Q2.
For more information: https://www.caclubindia.com/articles/due-date-for-filling-revise-tds-return-22587.asp