time limit to avail the ITC

Murugesan (Asst. Manager - Finance)   (180 Points)

22 April 2018  
we have filed the GSTR3B for the month of Mar 2018.

Now we have received some purchase bills from the supplier and bills dates are related F.Y.2017-18.

Kindly advise what is the procedure to account and avail the ITC