1.
ten days
A period of ten days.
十日ぐらいかかります。
It takes about ten days.
十日も待った。
I waited for ten days.
十日間の旅行です。
It's a ten-day trip.
あと十日で完成する。
It will be completed in ten days.
十日ぶりに会えた。
I got to see them for the first time in ten days.
2.
tenth day of the month
The tenth day of any month.
五月十日に会いましょう。
Let's meet on May 10th.
十日までに終わらせてください。
Please finish it by the 10th.
来月十日は空いていますか。
Are you free on the 10th of next month?
十日に届きます。
It will arrive on the 10th.
十日は忙しいです。
I'm busy on the 10th.
十日 uses native Japanese counting and has two meanings: the 10th day of the month, and a duration of ten days.
DAYS OF THE MONTH (1-10):
The first ten days use special native Japanese readings:
- 一日 (1st)
- 二日 (2nd)
- 三日 (3rd)
- 四日 (4th)
- 五日 (5th)
- 六日 (6th)
- 七日 (7th)
- 八日 (8th)
- 九日 (9th)
- 十日 (10th)
After the 10th, most days use Sino-Japanese numbers + 日 (e.g., 十一日).
DURATION USAGE:
- 十日間: a ten-day period
- 十日ぶりに: for the first time in ten days
- 十日ほどかかる: it takes about ten days