noun
5 PM; 17:00
Used in 24-hour time notation, common in schedules, official announcements, and transportation timetables.
会議は１７時から始まります。
The meeting starts at 5 PM.
新幹線は１７時に東京駅を出発します。
The Shinkansen departs from Tokyo Station at 17:00.
午後５時 is the 12-hour equivalent, more common in casual conversation. １７時 is preferred in formal or 24-hour contexts.
Compound of 十七 (seventeen) and 時 (hour), following standard Japanese number + counter formation.