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10th day of the month
ten days
一いち〇日にちは母ははの誕生たんじょう日ひだ。
The 10th is my mother's birthday.
一いち〇日にちの夜よるにパーティーがあります。
There's a party on the evening of the 10th.
一いち〇日にちまでにこの仕事しごとを全部ぜんぶ終わらおわらせなければ。
I have to finish all this work by the 10th.