appointment date; day of reservation
Refers to the specific date on which a reservation or appointment is scheduled. Commonly used in contexts like medical appointments, hotel bookings, or restaurant reservations.
I'd like to change the appointment date.
The day of the reservation is next Friday.
日程 is a broader term for 'schedule' or 'itinerary', not limited to reservations.
Compound of 予約 (reservation) and 日 (day). The reading よやくび follows standard rendaku voicing of ひ to び.