Does Yom Tov end the "Shloshim" period?

Question

I know that if people are sitting shiva, and a Yom Tov occurs in the middle of the shiva period, shiva immediately ends.

Does this same "quick end" rule apply to the shloshim (30 day mourning period) as well?

Answer 1

Yes, Shloshim is cancelled if Shiva ended before the holiday started. ShA YD 399:3