New answers tagged bentching
A similar question is when Rosh Chodesh is on Sunday, do we say "ya'aleh v'ya'vo" in bentching of Shalosh Seudos? There the answer (see Mishna Berura Siman 188 Sif Katan 33) is that it's a sofek (a doubt) and so we don't, unless you would eat at least a kazis of bread after tzeis when it's definitely night and then you would definitely say "ya'aleh v'ya'vo." ...
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