How to calculate post office fixed deposit income for filing itr?

Hi

I Opened an Fixed deposit on 20-07-2017 at Post Office for amount of 4 Lakhs at an Interest rate of 6.8%.

Now Fixed deposit has 8 months 10 days under FY 17-18 and 3 months 20 days under FY18-19.

Maturity was not Automatically, Instead i goto Post office on 26 March 2019 to Matured my FD. Interest earned was 27901 for FD period & 10,652 as 4% interest rate due to extended period.

Now My Question is, To File an ITR of FY18-19 How much income should i show? For the period of 3 months & 20 days with 10652 interest or The Whole amount which i got on 26-March-2019 i.e 27901+10652.

Note: Interest was Calculated quaterly and payable Yearly basis.