fromEnglish Grammar Today
The present simpleis used to refer to events in the future which are certain because they are facts, or because there is a clear or fixed schedule or timetable:
Her birthdayfallson a Friday next year.(a known fact about the future)
Shehasher driving test next week, does she?(a fixed arrangement)
The trainarrivesat 20.12.(a timetable)
What timedoestheir flight to Seoulleave?(a schedule)