Refers to being punctual or happening at the scheduled time. Often used in business or event contexts.
The meeting started on time.
work hours; time on duty
Used in contrast with オフタイム (off-duty time). Common in workplace or shift-work contexts.
See also: オフタイム
Please refrain from using your mobile phone during work hours.
Often considered incorrect usage; リアルタイム is the standard term. Still encountered in casual contexts for watching or experiencing something live.
See also: リアルタイム
I wanted to watch the game live, but I couldn't because of work.