If the date of burial was May 23, 2016, when does shloshim fall? Shavuot falls within 30 days. Does that change the determination of the date of shloshim?
The shloshim needs to be calculated by the Hebrew date. So May 23 corresponds to the 15 Iyar. Which means that the date of the shloshim is 15 Sivan (June 21) The restrictions imposed on the mourner during the shloshim (e,g. wearing new garments) ended due to Shavuos, but the shloshim date stays unchanged.
O:CH 548,8, Y:D 399:3