Section 80d fy2018-19 sr. citizen limit 50000 or 30000?

Hello, I was reading amendment to Income tax as per Finance Act 2018 Amendment of section 80D. It says: 26. In section 80D of the Income-tax Act, with effect from the 1st day of April, 2019,— (A) in sub-section (2),— (i) for the words "thirty thousand rupees" wherever they occur, the words "fifty thousand rupees" shall be substituted; (ii) in the first proviso occurring after clause (d), the word "very" shall be omitted; Now I am confused if its effect from 1st April 2019 then will I get exempt of 50000 for 80D health insurance this year (FY2018-2019) or from next year (FY2019-2020)? Can anyone clarify? Because many tax websites mention its 50000 from FY2018-2019 Even income tax calculator shows 50000 But then the amendment specifically says w.e.f from 1st April 2019