Translation guide
The English phrase 'on time' refers to punctuality—arriving or happening at the scheduled or expected time. In Japanese, this concept is expressed through various adverbs, adjectives, and set phrases, depending on the context and level of formality.
Describing an action or event that occurs at the planned time, without delay.
The most common and neutral way to say 'on time'. Used as an adverb to modify verbs like arrive, start, finish, etc.
電車は時間通りに来ました。
The train came on time.
The meeting started on time.
Formal term often used for transportation schedules (trains, planes) or official events. Implies strict adherence to a timetable.
飛行機は定刻に出発しました。
The plane departed on time.
Literally 'without being late'. Used as an adverb, often in instructions or expectations. Slightly more casual than 時間通りに.
遅れずに来てください。
Please come on time.
A noun meaning 'punctuality' or 'strict adherence to time'. Often seen on invitations or schedules as a request to be punctual.
開始時間厳守でお願いします。
Please be punctual (strictly on time).
Indicating that something will happen at the appropriate time, not necessarily immediately.
Means 'before long', 'in time', or 'eventually'. Used when the exact timing is not specified but expected to happen naturally.
そのうちに分かるよ。
You'll understand in time.
Similar to そのうちに but slightly more formal/literary. Can also mean 'sooner or later'.
いずれ雨はやむでしょう。
The rain will stop in time.
Arriving or happening exactly at the required moment, often narrowly avoiding lateness.
Means 'just barely on time' or 'at the last minute'. Conveys a sense of narrow escape from being late.
ぎりぎりで電車に間に合った。
I caught the train just in time.
Literally 'by a hair's breadth'. Emphasizes a very close call, often used in dramatic situations.
間一髪で間に合った。
I made it just in the nick of time.
時間通りに is the everyday expression for 'on time' and can be used in most situations. 定刻に is more formal and is typically used for scheduled transport or official events. Using 定刻に in casual conversation may sound stiff.
バスは時間通りに来た。
The bus came on time. (casual)
バスは定刻に到着しました。
The bus arrived on schedule. (formal announcement)
Do not translate 'on time' word-for-word as 時間の上に or similar. The natural Japanese expressions are idiomatic and must be learned as set phrases.