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10th day of the month
ten days
締め切りは今月の十日までだ。
The deadline is the 10th of this month.
十日に届くはずの荷物がまだ届いていない。
The package that was supposed to arrive on the 10th hasn't come yet.
来月の十日から夏休みが始まるよ。
Summer vacation starts from the 10th of next month.