Usage
Without 午前/午後, context decides whether it means 3 a.m. or 3 p.m.
Common patterns
- 午前三時: 3 AM
- 午後三時: 3 PM
- 三時半: 3:30
- 三時過ぎ: past three o'clock
Cultural note
三時のおやつ (the three o'clock snack) is a fixed phrase: children in Japan traditionally have their afternoon snack at three. The word おやつ itself comes from 八つ, the old name for the hour around 2 to 3 p.m.