One appointed to mark and declare the time of participants in races or other contests
Clerk at a marine terminal who keeps detailed records of the employment of every laborer hired on an hourly basis
One who keeps track of and records the amount of time spent on a particular project or issue
If you say that someone is a good timekeeper, you mean that they usually arrive on time for things. If you say that they are a poor timekeeper, you mean that they are often late