The date of a planned event or the day something will take place.
会議の日にちを来週の月曜に変更した。
The meeting date was changed to next Monday.
旅行の日にちを早めたい。
I want to move the travel date earlier.
打ち合わせの日にちと時間を知らせてください。
Please let me know the date and time of the meeting.
Used to refer to the number of days (e.g., length of stay or number of days).
出張の日にちと日数を教えてください。
Please tell me the date and the number of days of the business trip.
滞在の日にちは三日間です。
The length of the stay is three days.
夏休みの日にちを数えるのが楽しみだ。
I'm looking forward to counting the days until summer vacation.