My textbooks says the 30th is さんじゅうにち but can also be called みそか .

Is みそか often used ?

Which one do Japanese people use most ?
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2020-01-26T10:29:47.487
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2020-01-26T18:12:56.740
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Which term is better to use ? さんじゅうにち or みそか?
I rarely hear みそか around me except 大晦日{おおみそか}, which is 31 December, though
aged Japanese may use it.
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2020-01-26T18:12:56.740
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2020-01-26T18:12:56.740
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