My parent died at moon on the 8th of shevat and was buried at noon on the 9 th of shvat.
What is the final day of shloshim
Hamkom Yinachem eschem b’toch shar aveilei tzion v’yerushalayim.
The shiva and shloshim are calculated from the burial, which was on the 9th. Therefore the shloshim will end in the morning of the 8th of Adar 1.
Shlchan Aruch Y:D 375-1