When is shloshim?

Question:

My mother was buried on June 19 , 2018 in morning in USA. When is shloshim?

Answer:

Hamakom yinachem eschem b’toch shar aveilei tzion  v’yerushalayim.

The shloshim is calculated as the thirtieth day after the burial. Therefore the shloshim will be on the 6^th of av, July 18^th.

Sources:

Y:D 395-1, Taz Y:D 402-6, Shach ibid 5.