2nd home exemption on notional rent

It can be taken as NIL, from AY 2020-21 onwards.

Hi. I have a second home that is currently rented, but I would like to end the tenancy in January 2020. I have 2 questions.

(1) On the actual rent received from April 2019 to January 2020, I will pay tax as Income on House Property (with the standard 30% deduction). For the remaining period from January 2020 to March 2020, can I treat the second home as self-occupied and be exempt from any notional rent?

(2) On my reading of the Income Tax Act section 23, it it unclear if the exemption of the second home from notional rent is applicable from FY2019-20 or FY 2020-21 onwards. Any clarification would be very helpful.

Thank you and Regards,