TIMEKEEPER

[noun] [C] - an object or person that records (an amount of) timeThere's no point in having a clock which looks attractive if it isn't a good timekeeper (= if it doesn't record the time correctly).A timekeeper is a person who records the amount of time that people taking part in a race or competition take to finish the race or competition, or the amount of time that people at work spend working on their jobs.If you say that someone is a good timekeeper, you mean that they regularly arrive, esp. at work, at the time at which they are expected. A bad timekeeper is regularly late.