expression
what date?; when?
Used to ask for a specific calendar date (month and day). Often appears in forms, schedules, or when confirming an event date.
あなたの誕生日は何月何日ですか。
What date is your birthday?
次の会議は何月何日ですか。
What date is the next meeting?
Compound of 何月 (what month) and 何日 (what day), forming a fixed expression for asking a specific date.