Yosef Karo

“ If a person [for whom you are suppose to mourn] died prior to Purim and then Purim occurred [during the mourning period] , this does not end the mourning period. But in any event, mourning is not practiced on that day, neither on the 14th nor 15th [of the month of Adar] , except for those things which are done in private are practiced, and [the mourner] is obligated to send shalah manot, and even though one should not mourn on these days [the 14th and 15th of Adar] , they count [towards the seven days of shiva] like Shabbat [counts towards shiva] . ”

“ And there are those who disagree, that you should not say tziduk hadin on chol hamoed, and this is the widespread custom in these areas, not to say tziduk hadin for all days when one does not say tachanun, and therefore we also do not say [tziduk hadin] when you are burying [the deceased] after noon on Friday. There are those who say that if you are burying the deceased during the night, you do not say Kiddush and you do not say tziduk hadin. ”